Plummer-Vinson syndrome pathophysiology: Difference between revisions
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==Overview== | ==Overview== | ||
Plummer-Vinson syndrome is a rare condition characterized by [[iron-deficiency anemia]], [[glossitis]] and [[dysphagia]]. The exact [[pathogenesis]] of Plummer-Vinson syndrome is not fully understood. It is postulated that Plummer-Vinson syndrome results from [[iron deficiency]]. Other possible factors include [[malnutrition]], [[genetic predisposition]] and [[autoimmune disorders]]. In patients with iron deficiency, the iron-dependent oxidative enzymes are unable to function at optimum level and the dependent metabolic pathways (oxidative phosphorylation) are reduced. This promotes anaerobic metabolism with increased consumption of glucose and increased production of lactic acid and may lead to myasthenic changes in muscles. These myasthenic changes are often seen in muscles involved in swallowing and may lead to atrophy of the esophageal mucosa and formation of esophageal webs. Patients who do not exhibit obstructive lesions (web or stricture) may have dysphagia resulting from muscular in-coordination. Patients with iron deficiency have low levels of myoglobin which may affect the muscles of the tongue and lead to glossitis. In Plummer-Vinson syndrome, deficiency of iron can lead to epithelial atrophy and a decrease in the regenerative capacity of the mucosa. The decrease in rate of healing allows the chronic irritants to act progressively, predisposing the oral cavity and esophagus to malignant transformation (squamous cell carcinoma). Genes involved in the pathogenesis of iron deficiency anemia associated with Plummer-Vinson syndrome include mutation in TMPRSS6 gene. The TMPRSS6 gene encodes instructions for the protein hepcidin. Increased levels of hepcidin leads to decreased release of iron from ferritin and subsequently presents as iron deficiency anemia. On gross pathology, esophageal web and esophageal strictures are characteristic findings of Plummer-Vinson syndrome. On microscopic histopathological analysis, Plummer-Vinson syndrome presents with epithelial atrophy, chronic submucosal inflammation and epithelial atypia or dysplasia (in advanced cases) | Plummer-Vinson syndrome is a rare [[condition]] characterized by [[iron-deficiency anemia]], [[glossitis]] and [[dysphagia]]. The exact [[pathogenesis]] of Plummer-Vinson syndrome is not fully understood. It is postulated that Plummer-Vinson syndrome results from [[iron deficiency]]. Other possible factors include [[malnutrition]], [[genetic predisposition]] and [[autoimmune disorders]]. In [[patients]] with [[iron deficiency]], the [[iron]]-dependent [[oxidative]] [[enzymes]] are unable to function at optimum level and the dependent [[metabolic pathways]] ([[oxidative phosphorylation]]) are reduced. This promotes [[anaerobic metabolism]] with increased consumption of [[glucose]] and increased production of [[lactic acid]] and may lead to [[Myasthenia|myasthenic]] changes in [[muscles]]. These [[Myasthenia|myasthenic]] changes are often seen in [[muscles]] involved in [[swallowing]] and may lead to [[atrophy]] of the [[esophageal]] [[mucosa]] and formation of [[esophageal webs]]. Patients who do not exhibit obstructive [[lesions]] ([[Esophageal web|web]] or [[stricture]]) may have [[dysphagia]] resulting from [[muscular]] in-coordination. Patients with [[iron deficiency]] have low levels of [[myoglobin]] which may affect the [[muscles]] of the [[tongue]] and lead to glossitis. In Plummer-Vinson syndrome, [[Iron deficiency|deficiency of iron]] can lead to [[epithelial]] [[atrophy]] and a decrease in the [[regenerative]] capacity of the [[mucosa]]. The decrease in rate of [[healing]] allows the [[chronic]] [[irritants]] to act progressively, predisposing the [[oral cavity]] and [[esophagus]] to [[malignant]] [[transformation]] ([[squamous cell carcinoma]]). [[Genes]] involved in the [[pathogenesis]] of [[iron deficiency anemia]] associated with Plummer-Vinson syndrome include [[mutation]] in TMPRSS6 [[gene]]. The TMPRSS6 gene encodes instructions for the [[protein]] [[hepcidin]]. Increased levels of [[hepcidin]] leads to decreased release of [[iron]] from [[ferritin]] and subsequently presents as [[iron deficiency anemia]]. On gross [[pathology]], [[esophageal web]] and [[esophageal]] [[strictures]] are characteristic findings of Plummer-Vinson syndrome. On microscopic [[histopathological]] [[analysis]], Plummer-Vinson syndrome presents with [[epithelial]] [[atrophy]], [[chronic]] [[submucosal]] [[inflammation]] and [[epithelial]] [[atypia]] or [[dysplasia]] (in advanced cases). | ||
==Pathophysiology== | ==Pathophysiology== | ||
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*Plummer-Vinson syndrome is a rare condition characterized by [[iron-deficiency anemia]], [[glossitis]] and [[dysphagia]]. | *Plummer-Vinson syndrome is a rare condition characterized by [[iron-deficiency anemia]], [[glossitis]] and [[dysphagia]]. | ||
*The exact [[pathogenesis]] of Plummer-Vinson syndrome is not fully understood. It is postulated that Plummer-Vinson syndrome results from [[iron deficiency]]. Other possible factors include [[malnutrition]], [[genetic predisposition]] and [[autoimmune disorders]].<ref name="pmid4449772">{{cite journal |vauthors=Chisholm M |title=The association between webs, iron and post-cricoid carcinoma |journal=Postgrad Med J |volume=50 |issue=582 |pages=215–9 |year=1974 |pmid=4449772 |pmc=2495558 |doi= |url=}}</ref><ref name="pmid8482199">{{cite journal |vauthors=Dantas RO, Villanova MG |title=Esophageal motility impairment in Plummer-Vinson syndrome. Correction by iron treatment |journal=Dig. Dis. Sci. |volume=38 |issue=5 |pages=968–71 |year=1993 |pmid=8482199 |doi= |url=}}</ref><ref name="pmid16978405">{{cite journal |vauthors=Novacek G |title=Plummer-Vinson syndrome |journal=Orphanet J Rare Dis |volume=1 |issue= |pages=36 |year=2006 |pmid=16978405 |pmc=1586011 |doi=10.1186/1750-1172-1-36 |url=}}</ref><ref name="pmid3016824">{{cite journal |vauthors=Ekberg O, Malmquist J, Lindgren S |title=Pharyngo-oesophageal webs in dysphageal patients. A radiologic and clinical investigation in 1134 patients |journal=Rofo |volume=145 |issue=1 |pages=75–80 |year=1986 |pmid=3016824 |doi=10.1055/s-2008-1048889 |url=}}</ref> | *The exact [[pathogenesis]] of Plummer-Vinson syndrome is not fully understood. It is postulated that Plummer-Vinson syndrome results from [[iron deficiency]]. Other possible factors include [[malnutrition]], [[genetic predisposition]] and [[autoimmune disorders]].<ref name="pmid4449772">{{cite journal |vauthors=Chisholm M |title=The association between webs, iron and post-cricoid carcinoma |journal=Postgrad Med J |volume=50 |issue=582 |pages=215–9 |year=1974 |pmid=4449772 |pmc=2495558 |doi= |url=}}</ref><ref name="pmid8482199">{{cite journal |vauthors=Dantas RO, Villanova MG |title=Esophageal motility impairment in Plummer-Vinson syndrome. Correction by iron treatment |journal=Dig. Dis. Sci. |volume=38 |issue=5 |pages=968–71 |year=1993 |pmid=8482199 |doi= |url=}}</ref><ref name="pmid16978405">{{cite journal |vauthors=Novacek G |title=Plummer-Vinson syndrome |journal=Orphanet J Rare Dis |volume=1 |issue= |pages=36 |year=2006 |pmid=16978405 |pmc=1586011 |doi=10.1186/1750-1172-1-36 |url=}}</ref><ref name="pmid3016824">{{cite journal |vauthors=Ekberg O, Malmquist J, Lindgren S |title=Pharyngo-oesophageal webs in dysphageal patients. A radiologic and clinical investigation in 1134 patients |journal=Rofo |volume=145 |issue=1 |pages=75–80 |year=1986 |pmid=3016824 |doi=10.1055/s-2008-1048889 |url=}}</ref> | ||
**[[Iron]] plays a major role in the expression of [[Citric acid cycle|citric acid (TCA) cycle]] enzymes such as citrate synthase, | **[[Iron]] plays a major role in the expression of [[Citric acid cycle|citric acid (TCA) cycle]] enzymes such as [[citrate synthase]], [[isocitrate dehydrogenase]], and [[succinate dehydrogenase]]. | ||
**[[Iron]] replete cells with a normal functioning [[Citric acid cycle|citric acid (TCA) cycle]] have increased formation of reducing equivalents (such as NADH) leading to increased ATP formation via oxidative phosphorylation. | **[[Iron]] replete cells with a normal functioning [[Citric acid cycle|citric acid (TCA) cycle]] have increased formation of reducing equivalents (such as [[NADH]]) leading to increased [[ATP]] formation via [[oxidative phosphorylation]]. | ||
***In patients with iron deficiency, the iron-dependent oxidative enzymes are unable to function at optimum level and the dependent metabolic pathways (oxidative phosphorylation) are reduced. | ***In patients with [[iron deficiency]], the [[iron]]-dependent oxidative enzymes are unable to function at optimum level and the dependent [[metabolic]] pathways ([[oxidative phosphorylation]]) are reduced. | ||
***This promotes anaerobic metabolism with increased consumption of glucose and increased production of lactic acid | ***This promotes [[anaerobic metabolism]] with increased consumption of [[glucose]] and increased production of [[lactic acid]] which can lead to [[Myasthenia|myasthenic]] changes in [[muscles]]. | ||
***Myasthenic changes are often seen in muscles involved in swallowing which can lead to atrophy of the esophageal mucosa and formation of esophageal webs. | ***[[Myasthenia|Myasthenic]] changes are often seen in [[muscles]] involved in [[swallowing]] which can lead to [[atrophy]] of the [[esophageal]] [[mucosa]] and formation of [[esophageal webs]]. | ||
***The dysphagia in Plummer-Vinson syndrome results from esophageal (postcricoid) web or stricture. | ***The [[dysphagia]] in Plummer-Vinson syndrome results from [[esophageal]] (postcricoid) [[Esophageal web|web]] or [[Esophageal stricture|stricture]]. | ||
***However, patients who do not exhibit esophageal (postcricoid) web or stricture (obstructive lesions) may have dysphagia resulting from muscular in-coordination. | ***However, patients who do not exhibit [[esophageal]] (postcricoid) [[Esophageal web|web]] or [[Esophageal stricture|stricture]] (obstructive lesions) may have [[dysphagia]] resulting from [[muscular]] in-coordination. | ||
**[[Iron]] is also important in the [[synthesis]] of [[myoglobin]] which is responsible for meeting the [[energy]] demands of the [[muscle]]. Patients with [[iron deficiency]] have low levels of [[myoglobin]] which may affect the [[muscles]] of the [[tongue]] and lead to [[glossitis]]. | |||
**In Plummer-Vinson syndrome, [[Iron deficiency|deficiency of iron]] can lead to [[epithelial]] [[atrophy]] and a decrease in the [[regenerative]] capacity of the [[mucosa]]. The decrease in rate of [[healing]] allows the [[chronic]] [[irritants]] to act progressively, predisposing the [[oral cavity]] and [[esophagus]] to [[malignant]] [[transformation]] ([[squamous cell carcinoma]]). | |||
*Other factors involved in the [[pathogenesis]] of Plummer-Vinson syndrome include [[malnutrition]], [[genetic predisposition]] and [[autoimmune disorders]].<ref name="pmid23372354">{{cite journal |vauthors=Chong VH |title=Clinical significance of heterotopic gastric mucosal patch of the proximal esophagus |journal=World J. Gastroenterol. |volume=19 |issue=3 |pages=331–8 |year=2013 |pmid=23372354 |pmc=3554816 |doi=10.3748/wjg.v19.i3.331 |url=}}</ref><ref name="pmid8508079">{{cite journal |vauthors=Buse PE, Zuckerman GR, Balfe DM |title=Cervical esophageal web associated with a patch of heterotopic gastric mucosa |journal=Abdom Imaging |volume=18 |issue=3 |pages=227–8 |year=1993 |pmid=8508079 |doi= |url=}}</ref><ref name="pmid19473208">{{cite journal |vauthors=Basseri B, Conklin JL, Mertens RB, Lo SK, Bellack GS, Shaye OA |title=Heterotopic gastric mucosa (inlet patch) in a patient with laryngopharyngeal reflux (LPR) and laryngeal carcinoma: a case report and review of literature |journal=Dis. Esophagus |volume=22 |issue=4 |pages=E1–5 |year=2009 |pmid=19473208 |doi=10.1111/j.1442-2050.2008.00915.x |url=}}</ref><ref name="pmid8122657">{{cite journal |vauthors=Jerome-Zapadka KM, Clarke MR, Sekas G |title=Recurrent upper esophageal webs in association with heterotopic gastric mucosa: case report and literature review |journal=Am. J. Gastroenterol. |volume=89 |issue=3 |pages=421–4 |year=1994 |pmid=8122657 |doi= |url=}}</ref><ref name="pmid4007426">{{cite journal |vauthors=Jabbari M, Goresky CA, Lough J, Yaffe C, Daly D, Côté C |title=The inlet patch: heterotopic gastric mucosa in the upper esophagus |journal=Gastroenterology |volume=89 |issue=2 |pages=352–6 |year=1985 |pmid=4007426 |doi= |url=}}</ref><ref name="pmid15056100">{{cite journal |vauthors=von Rahden BH, Stein HJ, Becker K, Liebermann-Meffert D, Siewert JR |title=Heterotopic gastric mucosa of the esophagus: literature-review and proposal of a clinicopathologic classification |journal=Am. J. Gastroenterol. |volume=99 |issue=3 |pages=543–51 |year=2004 |pmid=15056100 |doi=10.1111/j.1572-0241.2004.04082.x |url=}}</ref> | |||
** Plummer-Vinson syndrome is seen in certain [[genetically]] predisposed individuals (such as [[mutation]] in TMPRSS6 gene) and those with [[malnutrition]]. | |||
** Recent [[research]] have shown that heterotopic gastric mucosa of the proximal esophagus (HGMPE) may predispose individuals to an increased risk of Plummer-Vinson syndrome. | |||
*Other factors involved in the pathogenesis of Plummer-Vinson syndrome include malnutrition, genetic predisposition and autoimmune disorders.<ref name="pmid23372354">{{cite journal |vauthors=Chong VH |title=Clinical significance of heterotopic gastric mucosal patch of the proximal esophagus |journal=World J. Gastroenterol. |volume=19 |issue=3 |pages=331–8 |year=2013 |pmid=23372354 |pmc=3554816 |doi=10.3748/wjg.v19.i3.331 |url=}}</ref><ref name="pmid8508079">{{cite journal |vauthors=Buse PE, Zuckerman GR, Balfe DM |title=Cervical esophageal web associated with a patch of heterotopic gastric mucosa |journal=Abdom Imaging |volume=18 |issue=3 |pages=227–8 |year=1993 |pmid=8508079 |doi= |url=}}</ref><ref name="pmid19473208">{{cite journal |vauthors=Basseri B, Conklin JL, Mertens RB, Lo SK, Bellack GS, Shaye OA |title=Heterotopic gastric mucosa (inlet patch) in a patient with laryngopharyngeal reflux (LPR) and laryngeal carcinoma: a case report and review of literature |journal=Dis. Esophagus |volume=22 |issue=4 |pages=E1–5 |year=2009 |pmid=19473208 |doi=10.1111/j.1442-2050.2008.00915.x |url=}}</ref><ref name="pmid8122657">{{cite journal |vauthors=Jerome-Zapadka KM, Clarke MR, Sekas G |title=Recurrent upper esophageal webs in association with heterotopic gastric mucosa: case report and literature review |journal=Am. J. Gastroenterol. |volume=89 |issue=3 |pages=421–4 |year=1994 |pmid=8122657 |doi= |url=}}</ref><ref name="pmid4007426">{{cite journal |vauthors=Jabbari M, Goresky CA, Lough J, Yaffe C, Daly D, Côté C |title=The inlet patch: heterotopic gastric mucosa in the upper esophagus |journal=Gastroenterology |volume=89 |issue=2 |pages=352–6 |year=1985 |pmid=4007426 |doi= |url=}}</ref><ref name="pmid15056100">{{cite journal |vauthors=von Rahden BH, Stein HJ, Becker K, Liebermann-Meffert D, Siewert JR |title=Heterotopic gastric mucosa of the esophagus: literature-review and proposal of a clinicopathologic classification |journal=Am. J. Gastroenterol. |volume=99 |issue=3 |pages=543–51 |year=2004 |pmid=15056100 |doi=10.1111/j.1572-0241.2004.04082.x |url=}}</ref> | *** The HGMPE is a congenital condition and also known as cervical inlet patch or inlet patch. | ||
** Plummer-Vinson syndrome is seen in certain genetically predisposed individuals (such as mutation in TMPRSS6 gene) and those with malnutrition. | *** HGMPE is a [[salmon]] colored heterotopic gastric mucosa patch that is located just [[distal]] to the [[upper esophageal sphincter]]. | ||
** | *** The HGMPE is associated with an increased [[Laryngopharyngeal Reflux Disease|laryngopharyngeal acid reflux]] and [[neoplastic]] transformation. | ||
*** The HGMPE is also known as inlet patch or | *** [[Laryngopharyngeal Reflux Disease|Laryngopharyngeal acid reflux]] results in an increased frequency of [[bleeding]] ([[iron deficiency anemia]]) and [[ulceration]] leading to formation of [[Esophageal web|web]] like structures in the [[esophagus]]. | ||
*** HGMPE is a salmon colored patch | ** Some researchers postulate that Plummer-Vinson syndrome may be due to an [[Autoimmune disease|autoimmune condition]]. This can be attributed to the fact that Plummer-Vinson syndrome has been observed to occur with an increased frequency in patients with other [[Autoimmune disorders|autoimmune conditions]] such as [[pernicious anemia]], [[rheumatoid arthritis]], [[autoimmune thyroiditis]] and [[celiac disease]].<ref name="pmid10022662">{{cite journal |vauthors=Dickey W, McConnell B |title=Celiac disease presenting as the Paterson-Brown Kelly (Plummer-Vinson) syndrome |journal=Am. J. Gastroenterol. |volume=94 |issue=2 |pages=527–9 |year=1999 |pmid=10022662 |doi=10.1111/j.1572-0241.1999.889_r.x |url=}}</ref><ref name="pmid11059192">{{cite journal |vauthors=Malhotra P, Kochhar R, Varma N, Kumari S, Jain S, Varma S |title=Paterson-Kelly syndrome and celiac disease--a rare combination |journal=Indian J Gastroenterol |volume=19 |issue=4 |pages=191–2 |year=2000 |pmid=11059192 |doi= |url=}}</ref><ref name="pmid14193944">{{cite journal |vauthors=ELWOOD PC, JACOBS A, PITMAN RG, ENTWISTLE CC |title=EPIDEMIOLOGY OF THE PATERSON-KELLY SYNDROME |journal=Lancet |volume=2 |issue=7362 |pages=716–20 |year=1964 |pmid=14193944 |doi= |url=}}</ref> | ||
*** The HGMPE is | |||
*** | |||
** Some researchers postulate that Plummer-Vinson syndrome may be due to an autoimmune condition. This can be attributed to the fact that Plummer-Vinson syndrome has been | |||
==Associated Conditions== | ==Associated Conditions== | ||
*Pharyngeal cancer | *[[Celiac disease]] | ||
*Esophageal cancer | *[[Hiatus hernia]] | ||
* | *Chronic [[gastrointestinal bleeding]] | ||
*[[Pharyngeal cancer (patient information)|Pharyngeal cancer]] | |||
*Rheumatoid arthritis | *[[Esophageal cancer]] | ||
*Autoimmune thyroiditis | *[[Pernicious anemia]] | ||
*[[Rheumatoid arthritis]] | |||
*[[Autoimmune thyroiditis]] | |||
==Genes== | ==Genes== | ||
The gene(s) involved in the pathogenesis of Plummer-Vinson syndrome include:<ref name="pmid28491880">{{cite journal |vauthors=Pinto J, Nobre de Jesus G, Palma Anselmo M, Gonçalves L, Brás D, Madeira Lopes J, Meneses J, Victorino R, Faustino P |title=Iron Refractory Iron Deficiency Anemia in Dizygotic Twins Due to a Novel TMPRSS6 Gene Mutation in Addition to Polymorphisms Associated With High Susceptibility to Develop Ferropenic Anemia |journal=J Investig Med High Impact Case Rep |volume=5 |issue=2 |pages=2324709617701776 |year=2017 |pmid=28491880 |pmc=5405884 |doi=10.1177/2324709617701776 |url=}}</ref><ref name="pmid28460265">{{cite journal |vauthors=Yaish HM, Farrell CP, Christensen RD, MacQueen BC, Jackson LK, Trochez-Enciso J, Kaplan J, Ward DM, Salah WK, Phillips JD |title=Two novel mutations in TMPRSS6 associated with iron-refractory iron deficiency anemia in a mother and child |journal=Blood Cells Mol. Dis. |volume=65 |issue= |pages=38–40 |year=2017 |pmid=28460265 |doi=10.1016/j.bcmd.2017.04.002 |url=}}</ref><ref name="pmid21789471">{{cite journal |vauthors=Camaschella C, Silvestri L |title=Molecular mechanisms regulating hepcidin revealed by hepcidin disorders |journal=ScientificWorldJournal |volume=11 |issue= |pages=1357–66 |year=2011 |pmid=21789471 |doi=10.1100/tsw.2011.130 |url=}}</ref><ref name="pmid20620132">{{cite journal |vauthors=Franchini M, Montagnana M, Lippi G |title=Hepcidin and iron metabolism: from laboratory to clinical implications |journal=Clin. Chim. Acta |volume=411 |issue=21-22 |pages=1565–9 |year=2010 |pmid=20620132 |doi=10.1016/j.cca.2010.07.003 |url=}}</ref><ref name="pmid21789471">{{cite journal |vauthors=Camaschella C, Silvestri L |title=Molecular mechanisms regulating hepcidin revealed by hepcidin disorders |journal=ScientificWorldJournal |volume=11 |issue= |pages=1357–66 |year=2011 |pmid=21789471 |doi=10.1100/tsw.2011.130 |url=}}</ref> | The [[gene]](s) involved in the [[pathogenesis]] of Plummer-Vinson syndrome include:<ref name="pmid28491880">{{cite journal |vauthors=Pinto J, Nobre de Jesus G, Palma Anselmo M, Gonçalves L, Brás D, Madeira Lopes J, Meneses J, Victorino R, Faustino P |title=Iron Refractory Iron Deficiency Anemia in Dizygotic Twins Due to a Novel TMPRSS6 Gene Mutation in Addition to Polymorphisms Associated With High Susceptibility to Develop Ferropenic Anemia |journal=J Investig Med High Impact Case Rep |volume=5 |issue=2 |pages=2324709617701776 |year=2017 |pmid=28491880 |pmc=5405884 |doi=10.1177/2324709617701776 |url=}}</ref><ref name="pmid28460265">{{cite journal |vauthors=Yaish HM, Farrell CP, Christensen RD, MacQueen BC, Jackson LK, Trochez-Enciso J, Kaplan J, Ward DM, Salah WK, Phillips JD |title=Two novel mutations in TMPRSS6 associated with iron-refractory iron deficiency anemia in a mother and child |journal=Blood Cells Mol. Dis. |volume=65 |issue= |pages=38–40 |year=2017 |pmid=28460265 |doi=10.1016/j.bcmd.2017.04.002 |url=}}</ref><ref name="pmid21789471">{{cite journal |vauthors=Camaschella C, Silvestri L |title=Molecular mechanisms regulating hepcidin revealed by hepcidin disorders |journal=ScientificWorldJournal |volume=11 |issue= |pages=1357–66 |year=2011 |pmid=21789471 |doi=10.1100/tsw.2011.130 |url=}}</ref><ref name="pmid20620132">{{cite journal |vauthors=Franchini M, Montagnana M, Lippi G |title=Hepcidin and iron metabolism: from laboratory to clinical implications |journal=Clin. Chim. Acta |volume=411 |issue=21-22 |pages=1565–9 |year=2010 |pmid=20620132 |doi=10.1016/j.cca.2010.07.003 |url=}}</ref><ref name="pmid21789471">{{cite journal |vauthors=Camaschella C, Silvestri L |title=Molecular mechanisms regulating hepcidin revealed by hepcidin disorders |journal=ScientificWorldJournal |volume=11 |issue= |pages=1357–66 |year=2011 |pmid=21789471 |doi=10.1100/tsw.2011.130 |url=}}</ref> | ||
*Genes involved in the pathogenesis of iron deficiency anemia associated with Plummer-Vinson syndrome include mutation in TMPRSS6 gene. | *[[Genes]] involved in the [[pathogenesis]] of [[iron deficiency anemia]] associated with Plummer-Vinson syndrome include [[mutation]] in TMPRSS6 [[gene]]. | ||
*Mutation in TMPRSS6 gene results in | *[[Mutation]] in TMPRSS6 [[gene]] results in iron-refractory [[iron deficiency anemia]] ([[Iron deficiency anemia|IRIDA]]). | ||
*TMPRSS6 gene is located on long arm (q) of chromosome 21 at position 22q12.3. | *TMPRSS6 gene is located on long arm (q) of [[chromosome 21]] at position 22q12.3. | ||
*The TMPRSS6 gene encodes instructions for the protein hepcidin. | *The TMPRSS6 gene encodes instructions for the [[protein]] [[hepcidin]]. | ||
*At least 40 different types of mutations have been identified in the TMPRSS6 gene. | *At least 40 different types of [[mutations]] have been identified in the TMPRSS6 [[gene]]. | ||
*Mutated TMPRSS6 gene leads to uninhibited production of hepcidin. | *[[Mutated]] TMPRSS6 gene leads to uninhibited production of [[hepcidin]]. | ||
*Overproduction of hepcidin leads to internalization and degradation of ferroportin. Ferroportin is present in the basolateral membrane of duodenal cells and mediates the transfer of iron from duodenal cells to transferrin in blood. | *Overproduction of [[hepcidin]] leads to internalization and degradation of [[ferroportin]]. [[Ferroportin]] is present in the [[basolateral membrane]] of [[Duodenal|duodenal cells]] and mediates the transfer of [[iron]] from [[duodenal]] cells to [[transferrin]] in blood. | ||
*Increased levels of hepcidin leads to decreased release of iron from ferritin and subsequently presents as iron deficiency anemia. | *Increased levels of [[hepcidin]] leads to decreased release of [[iron]] from [[ferritin]] and subsequently presents as [[iron deficiency anemia]]. | ||
==Gross Pathology== | ==Gross Pathology== | ||
*On gross pathology, esophageal web and esophageal strictures are characteristic findings of Plummer-Vinson syndrome. | *On [[gross pathology]], [[esophageal web]] and [[Esophageal stricture|esophageal strictures]] are characteristic findings of Plummer-Vinson syndrome. | ||
==Microscopic Pathology== | ==Microscopic Pathology== | ||
On microscopic histopathological analysis, Plummer-Vinson syndrome presents with the following findings: | On [[microscopic]] [[histopathological]] analysis, Plummer-Vinson syndrome presents with the following findings: | ||
*Epithelial atrophy | *Epithelial atrophy | ||
*Chronic submucosal inflammation | *[[Chronic]] [[submucosal]] [[inflammation]] | ||
*Epithelial atypia or dysplasia | *[[Epithelial]] [[atypia]] or [[dysplasia]] | ||
*Squamous cell carcinoma of esophagus (in advanced cases) | *[[Squamous cell carcinoma]] of [[esophagus]] (in advanced cases) | ||
[[File:Esophageal squamous cell carcinoma.jpg|thumb|center|Histology of esophageal squamous cell carcinoma ([By Nephron (Own work) [CC BY-SA 3.0 (https://creativecommons.org/licenses/by-sa/3.0) or GFDL (http://www.gnu.org/copyleft/fdl.html)], via Wikimedia Commons])]] | [[File:Esophageal squamous cell carcinoma.jpg|thumb|center|Histology of esophageal squamous cell carcinoma ([By Nephron (Own work) [CC BY-SA 3.0 (https://creativecommons.org/licenses/by-sa/3.0) or GFDL (http://www.gnu.org/copyleft/fdl.html)], via Wikimedia Commons])]] | ||
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[[Category:Gastroenterology]] | [[Category:Gastroenterology]] | ||
[[Category:Hematology]] | [[Category:Hematology]] | ||
<references /> | |||
Latest revision as of 19:18, 27 November 2017
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Plummer-Vinson syndrome Microchapters |
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Plummer-Vinson syndrome pathophysiology On the Web |
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Risk calculators and risk factors for Plummer-Vinson syndrome pathophysiology |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Akshun Kalia M.B.B.S.[2]
Overview
Plummer-Vinson syndrome is a rare condition characterized by iron-deficiency anemia, glossitis and dysphagia. The exact pathogenesis of Plummer-Vinson syndrome is not fully understood. It is postulated that Plummer-Vinson syndrome results from iron deficiency. Other possible factors include malnutrition, genetic predisposition and autoimmune disorders. In patients with iron deficiency, the iron-dependent oxidative enzymes are unable to function at optimum level and the dependent metabolic pathways (oxidative phosphorylation) are reduced. This promotes anaerobic metabolism with increased consumption of glucose and increased production of lactic acid and may lead to myasthenic changes in muscles. These myasthenic changes are often seen in muscles involved in swallowing and may lead to atrophy of the esophageal mucosa and formation of esophageal webs. Patients who do not exhibit obstructive lesions (web or stricture) may have dysphagia resulting from muscular in-coordination. Patients with iron deficiency have low levels of myoglobin which may affect the muscles of the tongue and lead to glossitis. In Plummer-Vinson syndrome, deficiency of iron can lead to epithelial atrophy and a decrease in the regenerative capacity of the mucosa. The decrease in rate of healing allows the chronic irritants to act progressively, predisposing the oral cavity and esophagus to malignant transformation (squamous cell carcinoma). Genes involved in the pathogenesis of iron deficiency anemia associated with Plummer-Vinson syndrome include mutation in TMPRSS6 gene. The TMPRSS6 gene encodes instructions for the protein hepcidin. Increased levels of hepcidin leads to decreased release of iron from ferritin and subsequently presents as iron deficiency anemia. On gross pathology, esophageal web and esophageal strictures are characteristic findings of Plummer-Vinson syndrome. On microscopic histopathological analysis, Plummer-Vinson syndrome presents with epithelial atrophy, chronic submucosal inflammation and epithelial atypia or dysplasia (in advanced cases).
Pathophysiology
Pathogenesis
- Plummer-Vinson syndrome is a rare condition characterized by iron-deficiency anemia, glossitis and dysphagia.
- The exact pathogenesis of Plummer-Vinson syndrome is not fully understood. It is postulated that Plummer-Vinson syndrome results from iron deficiency. Other possible factors include malnutrition, genetic predisposition and autoimmune disorders.[1][2][3][4]
- Iron plays a major role in the expression of citric acid (TCA) cycle enzymes such as citrate synthase, isocitrate dehydrogenase, and succinate dehydrogenase.
- Iron replete cells with a normal functioning citric acid (TCA) cycle have increased formation of reducing equivalents (such as NADH) leading to increased ATP formation via oxidative phosphorylation.
- In patients with iron deficiency, the iron-dependent oxidative enzymes are unable to function at optimum level and the dependent metabolic pathways (oxidative phosphorylation) are reduced.
- This promotes anaerobic metabolism with increased consumption of glucose and increased production of lactic acid which can lead to myasthenic changes in muscles.
- Myasthenic changes are often seen in muscles involved in swallowing which can lead to atrophy of the esophageal mucosa and formation of esophageal webs.
- The dysphagia in Plummer-Vinson syndrome results from esophageal (postcricoid) web or stricture.
- However, patients who do not exhibit esophageal (postcricoid) web or stricture (obstructive lesions) may have dysphagia resulting from muscular in-coordination.
- Iron is also important in the synthesis of myoglobin which is responsible for meeting the energy demands of the muscle. Patients with iron deficiency have low levels of myoglobin which may affect the muscles of the tongue and lead to glossitis.
- In Plummer-Vinson syndrome, deficiency of iron can lead to epithelial atrophy and a decrease in the regenerative capacity of the mucosa. The decrease in rate of healing allows the chronic irritants to act progressively, predisposing the oral cavity and esophagus to malignant transformation (squamous cell carcinoma).
- Other factors involved in the pathogenesis of Plummer-Vinson syndrome include malnutrition, genetic predisposition and autoimmune disorders.[5][6][7][8][9][10]
- Plummer-Vinson syndrome is seen in certain genetically predisposed individuals (such as mutation in TMPRSS6 gene) and those with malnutrition.
- Recent research have shown that heterotopic gastric mucosa of the proximal esophagus (HGMPE) may predispose individuals to an increased risk of Plummer-Vinson syndrome.
- The HGMPE is a congenital condition and also known as cervical inlet patch or inlet patch.
- HGMPE is a salmon colored heterotopic gastric mucosa patch that is located just distal to the upper esophageal sphincter.
- The HGMPE is associated with an increased laryngopharyngeal acid reflux and neoplastic transformation.
- Laryngopharyngeal acid reflux results in an increased frequency of bleeding (iron deficiency anemia) and ulceration leading to formation of web like structures in the esophagus.
- Some researchers postulate that Plummer-Vinson syndrome may be due to an autoimmune condition. This can be attributed to the fact that Plummer-Vinson syndrome has been observed to occur with an increased frequency in patients with other autoimmune conditions such as pernicious anemia, rheumatoid arthritis, autoimmune thyroiditis and celiac disease.[11][12][13]
Associated Conditions
- Celiac disease
- Hiatus hernia
- Chronic gastrointestinal bleeding
- Pharyngeal cancer
- Esophageal cancer
- Pernicious anemia
- Rheumatoid arthritis
- Autoimmune thyroiditis
Genes
The gene(s) involved in the pathogenesis of Plummer-Vinson syndrome include:[14][15][16][17][16]
- Genes involved in the pathogenesis of iron deficiency anemia associated with Plummer-Vinson syndrome include mutation in TMPRSS6 gene.
- Mutation in TMPRSS6 gene results in iron-refractory iron deficiency anemia (IRIDA).
- TMPRSS6 gene is located on long arm (q) of chromosome 21 at position 22q12.3.
- The TMPRSS6 gene encodes instructions for the protein hepcidin.
- At least 40 different types of mutations have been identified in the TMPRSS6 gene.
- Mutated TMPRSS6 gene leads to uninhibited production of hepcidin.
- Overproduction of hepcidin leads to internalization and degradation of ferroportin. Ferroportin is present in the basolateral membrane of duodenal cells and mediates the transfer of iron from duodenal cells to transferrin in blood.
- Increased levels of hepcidin leads to decreased release of iron from ferritin and subsequently presents as iron deficiency anemia.
Gross Pathology
- On gross pathology, esophageal web and esophageal strictures are characteristic findings of Plummer-Vinson syndrome.
Microscopic Pathology
On microscopic histopathological analysis, Plummer-Vinson syndrome presents with the following findings:
- Epithelial atrophy
- Chronic submucosal inflammation
- Epithelial atypia or dysplasia
- Squamous cell carcinoma of esophagus (in advanced cases)
References
- ↑ Chisholm M (1974). "The association between webs, iron and post-cricoid carcinoma". Postgrad Med J. 50 (582): 215–9. PMC 2495558. PMID 4449772.
- ↑ Dantas RO, Villanova MG (1993). "Esophageal motility impairment in Plummer-Vinson syndrome. Correction by iron treatment". Dig. Dis. Sci. 38 (5): 968–71. PMID 8482199.
- ↑ Novacek G (2006). "Plummer-Vinson syndrome". Orphanet J Rare Dis. 1: 36. doi:10.1186/1750-1172-1-36. PMC 1586011. PMID 16978405.
- ↑ Ekberg O, Malmquist J, Lindgren S (1986). "Pharyngo-oesophageal webs in dysphageal patients. A radiologic and clinical investigation in 1134 patients". Rofo. 145 (1): 75–80. doi:10.1055/s-2008-1048889. PMID 3016824.
- ↑ Chong VH (2013). "Clinical significance of heterotopic gastric mucosal patch of the proximal esophagus". World J. Gastroenterol. 19 (3): 331–8. doi:10.3748/wjg.v19.i3.331. PMC 3554816. PMID 23372354.
- ↑ Buse PE, Zuckerman GR, Balfe DM (1993). "Cervical esophageal web associated with a patch of heterotopic gastric mucosa". Abdom Imaging. 18 (3): 227–8. PMID 8508079.
- ↑ Basseri B, Conklin JL, Mertens RB, Lo SK, Bellack GS, Shaye OA (2009). "Heterotopic gastric mucosa (inlet patch) in a patient with laryngopharyngeal reflux (LPR) and laryngeal carcinoma: a case report and review of literature". Dis. Esophagus. 22 (4): E1–5. doi:10.1111/j.1442-2050.2008.00915.x. PMID 19473208.
- ↑ Jerome-Zapadka KM, Clarke MR, Sekas G (1994). "Recurrent upper esophageal webs in association with heterotopic gastric mucosa: case report and literature review". Am. J. Gastroenterol. 89 (3): 421–4. PMID 8122657.
- ↑ Jabbari M, Goresky CA, Lough J, Yaffe C, Daly D, Côté C (1985). "The inlet patch: heterotopic gastric mucosa in the upper esophagus". Gastroenterology. 89 (2): 352–6. PMID 4007426.
- ↑ von Rahden BH, Stein HJ, Becker K, Liebermann-Meffert D, Siewert JR (2004). "Heterotopic gastric mucosa of the esophagus: literature-review and proposal of a clinicopathologic classification". Am. J. Gastroenterol. 99 (3): 543–51. doi:10.1111/j.1572-0241.2004.04082.x. PMID 15056100.
- ↑ Dickey W, McConnell B (1999). "Celiac disease presenting as the Paterson-Brown Kelly (Plummer-Vinson) syndrome". Am. J. Gastroenterol. 94 (2): 527–9. doi:10.1111/j.1572-0241.1999.889_r.x. PMID 10022662.
- ↑ Malhotra P, Kochhar R, Varma N, Kumari S, Jain S, Varma S (2000). "Paterson-Kelly syndrome and celiac disease--a rare combination". Indian J Gastroenterol. 19 (4): 191–2. PMID 11059192.
- ↑ ELWOOD PC, JACOBS A, PITMAN RG, ENTWISTLE CC (1964). "EPIDEMIOLOGY OF THE PATERSON-KELLY SYNDROME". Lancet. 2 (7362): 716–20. PMID 14193944.
- ↑ Pinto J, Nobre de Jesus G, Palma Anselmo M, Gonçalves L, Brás D, Madeira Lopes J, Meneses J, Victorino R, Faustino P (2017). "Iron Refractory Iron Deficiency Anemia in Dizygotic Twins Due to a Novel TMPRSS6 Gene Mutation in Addition to Polymorphisms Associated With High Susceptibility to Develop Ferropenic Anemia". J Investig Med High Impact Case Rep. 5 (2): 2324709617701776. doi:10.1177/2324709617701776. PMC 5405884. PMID 28491880.
- ↑ Yaish HM, Farrell CP, Christensen RD, MacQueen BC, Jackson LK, Trochez-Enciso J, Kaplan J, Ward DM, Salah WK, Phillips JD (2017). "Two novel mutations in TMPRSS6 associated with iron-refractory iron deficiency anemia in a mother and child". Blood Cells Mol. Dis. 65: 38–40. doi:10.1016/j.bcmd.2017.04.002. PMID 28460265.
- ↑ 16.0 16.1 Camaschella C, Silvestri L (2011). "Molecular mechanisms regulating hepcidin revealed by hepcidin disorders". ScientificWorldJournal. 11: 1357–66. doi:10.1100/tsw.2011.130. PMID 21789471.
- ↑ Franchini M, Montagnana M, Lippi G (2010). "Hepcidin and iron metabolism: from laboratory to clinical implications". Clin. Chim. Acta. 411 (21–22): 1565–9. doi:10.1016/j.cca.2010.07.003. PMID 20620132.