Chronic pancreatitis pathophysiology: Difference between revisions

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{{Chronic pancreatitis}}
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==Overview==
==Overview==
Chronic pancreatitis is a progressive [[inflammatory]] process leading to irreversible structural damage to the [[pancreas]] resulting in [[exocrine]] and [[endocrine]] dysfunction. The [[pathogenesis]] is still unclear and multifactorial. Decreased [[bicarbonate]] secretion and intrapancreatic activation of [[digestive enzymes]] is thought to play an important role in the [[pathogenesis]] of chronic pancreatitis. Other factors that are thought to play an important role in the [[pathogenesis]] of chronic pancreatitis may include intraductal plugging and obstruction, direct injury to [[pancreatic]] [[cells]] induced by toxins and toxic metabolites, [[antioxidants]], [[ischemia]], [[autoimmune disorders]], the sentinal [[acute pancreatitis]] event (SAPE), [[necrosis]] and [[fibrosis]]. [[Genes]] involved in the [[pathogenesis]] of chronic pancreatitis include [[Cystic fibrosis transmembrane conductance regulator|CFTR-]]<nowiki/>[[cystic fibrosis]] [[gene mutation]], SPINK-1 [[mutation]], which encodes for [[trypsin inhibitor]], PRSS-1 [[gene mutation]] linked to [[hereditary pancreatitis]], claudin-2 ([[CLDN2]]), and [[carboxypeptidase A1]] ([[Carboxypeptidase A|CPA1]]) [[Gene mutation|gene mutations]]. Associated conditions may include [[autoimmune]] conditions, [[primary biliary cirrhosis]], [[primary sclerosing cholangitis]], [[Sjögren's syndrome|Sjögren syndrome]], and [[renal tubular acidosis]]. [[Gross pathology]] may include enlarged or [[atrophic]] [[pancreas]], [[cysts]], [[Calcification|calcifications]], [[fibrosis]] and patchy focal [[necrosis]]. [[Microscopic]] [[histopathological]] analysis may show patchy focal disease characterized by a [[Mononuclear cells|mononuclear]] infiltrate.


==Pathophysiology==
==Pathophysiology==
*Chronic pancreatitis is a progressive inflammatory process leading to irreversible structural damage to pancreas resulting in exocrine and endocrine dysfunction<ref name="pmid7739686">{{cite journal |vauthors=Steer ML, Waxman I, Freedman S |title=Chronic pancreatitis |journal=N. Engl. J. Med. |volume=332 |issue=22 |pages=1482–90 |year=1995 |pmid=7739686 |doi=10.1056/NEJM199506013322206 |url=}}</ref>
Chronic pancreatitis is a progressive [[inflammatory]] process leading to irreversible structural damage to the pancreas resulting in [[exocrine]] and [[endocrine]] dysfunction.<ref name="pmid7739686">{{cite journal |vauthors=Steer ML, Waxman I, Freedman S |title=Chronic pancreatitis |journal=N. Engl. J. Med. |volume=332 |issue=22 |pages=1482–90 |year=1995 |pmid=7739686 |doi=10.1056/NEJM199506013322206 |url=}}</ref> The [[pathogenesis]] is still unclear and multifactorial; but two mechanisms that play an important role in the [[pathogenesis]] of chronic pancreatitis, which are as follows:
*
 
=== Decreased bicarbonate secretion: ===
A decrease in [[bicarbonate]] secretion may be due to any of the following causes:
* [[Genetic]] causes leading to functional abnormalities of ductal cells 
* Obstructive causes such as:
** [[Stricture]]
** [[Malignancy]]
** [[Tumor]]
 
* [[Protein]] hypersecretion resulting in proteinaceous ductal plugs leading to ductal blockage and obstruction<ref name="pmid510088">{{cite journal |vauthors=Sahel J, Sarles H |title=Modifications of pure human pancreatic juice induced by chronic alcohol consumption |journal=Dig. Dis. Sci. |volume=24 |issue=12 |pages=897–905 |year=1979 |pmid=510088 |doi= |url=}}</ref>
 
=== Intrapancreatic activation of digestive enzymes: ===
* Usually results from [[genetic]] causes leading to:
** Impaired [[enzyme]] activation and regulation
** Predisposition to injury from toxic environmental stimuli such as [[alcohol]] or [[cigarette smoking]]
 
[[Image:1024px-Pancreatic stellate cell activation in chronic pancreatitis and pancreatic cancer.jpg|500 px|thumb|center|By Robert Jaster [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons]]
Other factors that are thought to play an important role in the [[pathogenesis]] of chronic pancreatitis include:
 
==== (a) Intraductal plugging and obstruction ====
 
===== 1) Proteinaceous ductal plugs =====
* [[Interlobular duct|Interlobular]] and [[intralobular duct]] blockage due to abnormal secretion of pancreatic [[proteins]] in the [[pancreatic juice]].<ref name="pmid510088">{{cite journal |vauthors=Sahel J, Sarles H |title=Modifications of pure human pancreatic juice induced by chronic alcohol consumption |journal=Dig. Dis. Sci. |volume=24 |issue=12 |pages=897–905 |year=1979 |pmid=510088 |doi= |url=}}</ref>
** GP2, a glycosyl phosphatidylinositol anchored [[protein]] is found to be a major component of plugs.<ref name="pmid8326020">{{cite journal |vauthors=Freedman SD, Sakamoto K, Venu RP |title=GP2, the homologue to the renal cast protein uromodulin, is a major component of intraductal plugs in chronic pancreatitis |journal=J. Clin. Invest. |volume=92 |issue=1 |pages=83–90 |year=1993 |pmid=8326020 |pmc=293537 |doi=10.1172/JCI116602 |url=}}</ref>
** Low levels of lithostathine in [[Alcoholic|alcoholics]], a protective [[protein]] secreted by [[pancreatic]] [[acinar cells]] that prevent stone ([[calcium carbonate]]) formation.<ref name="pmid6401181">{{cite journal |vauthors=Guy O, Robles-Diaz G, Adrich Z, Sahel J, Sarles H |title=Protein content of precipitates present in pancreatic juice of alcoholic subjects and patients with chronic calcifying pancreatitis |journal=Gastroenterology |volume=84 |issue=1 |pages=102–7 |year=1983 |pmid=6401181 |doi= |url=}}</ref>
 
* These proteinaceous plugs are the major sites for [[calcification]] and stone formation leading to:
** Ductal [[epithelial]] [[lesions]] and [[inflammatory]] changes
** [[Scarring]]
** Obstruction
 
===== 2) Intraductal obstruction due to other causes =====
* Chronic exposure to stones results in damage to ductal [[epithelial cells]] and [[Acinar gland|acinar glands]] via:
** [[Ulceration]]
** [[Scarring]]
** Obstruction
* Biliaropancreatic [[tumors]] ([[pancreatic]] [[adenocarcinoma]], [[neuroendocrine tumors]], and intrapapillary [[mucinous]] [[tumors]])
* [[Ethanol]] abuse
** [[Alcohol]] may increase the lithogenecity of [[pancreatic juice]] resulting in increased stone formation
 
==== (b) Direct injury to pancreatic cells induced by toxins and toxic metabolites ====
* [[Alcohol]] is proposed to have a direct toxic effect on the [[pancreas]] and damage the [[acinar cells]] via a change in [[intracellular]] [[metabolism]] ([[mitochondrial]] damage).
* It is metabolized by the [[pancreas]] and may result in [[oxidative stress]] and induce the release of pancreatic enzymes. This excessive release may result in autodigestion of the [[gland]].
* Additionally, [[alcohol]] may result in activation of [[pancreatic]] [[Stellate cell|stellate cells]] which are primarily responsible for [[fibrosis]] of the [[gland]] and weakening of the [[intracellular]] [[membranes]], which results in [[anatomical]] changes in the [[pancreas]], further predisposing to pathological autodigestion.<ref name="pmid21091991">{{cite journal| author=Apte MV, Pirola RC, Wilson JS| title=Mechanisms of alcoholic pancreatitis. | journal=J Gastroenterol Hepatol | year= 2010 | volume= 25 | issue= 12 | pages= 1816-26 | pmid=21091991 | doi=10.1111/j.1440-1746.2010.06445.x | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=21091991  }}</ref><ref name="acutepancreatitis">{{cite journal
| last      = Forsmark
| first      = Chris E.
| last2      = Vege
| first2    = Santhi Swaroop
| last3      = Wilcox
| first3    = Mel
| date      = November 17,2016
| title      = Acute Pancreatitis
| url        = http://www.nejm.org/doi/full/10.1056/NEJMra1505202
| journal    = The New England Journal of Medicine
| volume    =
| issue      =
| pages      = 1972 - 1981
| doi        = 10.1056/NEJMra1505202
| pmc        =
| pmid      =
| access-date = November 25,2016
| name-list-format = vanc
}}</ref>
* [[Smoking]] may exacerbate [[pancreatitis]] in alcoholics.
* [[Smoking]] is also found as an independent [[risk factor]] in the development and progression of [[pancreatitis]] as:
** It may affect [[pancreatic]] [[bicarbonate]] and water secretion
** It may predispose to [[oxidative stress]]
** It may also increases the rate of [[pancreatic]] [[calcification]]
 
==== (c) Antioxidants ====
* [[Steatorrhea]] in chronic pancreatitis may lead to [[nutritional deficiencies]]  and decreased levels of [[antioxidants]] such as:<ref name="pmid3957720">{{cite journal |vauthors=Rose P, Fraine E, Hunt LP, Acheson DW, Braganza JM |title=Dietary antioxidants and chronic pancreatitis |journal=Hum Nutr Clin Nutr |volume=40 |issue=2 |pages=151–64 |year=1986 |pmid=3957720 |doi= |url=}}</ref><ref name="pmid3224602">{{cite journal |vauthors=Uden S, Acheson DW, Reeves J, Worthington HV, Hunt LP, Brown S, Braganza JM |title=Antioxidants, enzyme induction, and chronic pancreatitis: a reappraisal following studies in patients on anticonvulsants |journal=Eur J Clin Nutr |volume=42 |issue=7 |pages=561–9 |year=1988 |pmid=3224602 |doi= |url=}}</ref>
** [[Selenium]]
** [[Vitamin C]] and [[Vitamin E|E]]
** [[Methionine]]
 
* Decreased [[antioxidant]] levels may result in:<ref name="pmid3361161">{{cite journal |vauthors=Braganza JM, Thomas A, Robinson A |title=Antioxidants to treat chronic pancreatitis in childhood? Case report and possible implications for pathogenesis |journal=Int. J. Pancreatol. |volume=3 |issue=2-3 |pages=209–16 |year=1988 |pmid=3361161 |doi=10.1007/BF02798933 |url=}}</ref><ref name="pmid18952082">{{cite journal |vauthors=Bhardwaj P, Garg PK, Maulik SK, Saraya A, Tandon RK, Acharya SK |title=A randomized controlled trial of antioxidant supplementation for pain relief in patients with chronic pancreatitis |journal=Gastroenterology |volume=136 |issue=1 |pages=149–159.e2 |year=2009 |pmid=18952082 |doi=10.1053/j.gastro.2008.09.028 |url=}}</ref><ref name="pmid21083584">{{cite journal |vauthors=Burton F, Alkaade S, Collins D, Muddana V, Slivka A, Brand RE, Gelrud A, Banks PA, Sherman S, Anderson MA, Romagnuolo J, Lawrence C, Baillie J, Gardner TB, Lewis MD, Amann ST, Lieb JG, O'Connell M, Kennard ED, Yadav D, Whitcomb DC, Forsmark CE |title=Use and perceived effectiveness of non-analgesic medical therapies for chronic pancreatitis in the United States |journal=Aliment. Pharmacol. Ther. |volume=33 |issue=1 |pages=149–59 |year=2011 |pmid=21083584 |pmc=3142582 |doi=10.1111/j.1365-2036.2010.04491.x |url=}}</ref>
** Increased [[free radical]] formation
** [[Lipid peroxidation]]
** [[Cellular]] damage
 
==== (d) Ischemia ====
* [[Ischemia]] is an important precipitating factor in the [[pathogenesis]] of chronic pancreatitis.
 
* [[Fibrosis]] and inelasticity of [[pancreatic]] [[Tissue (biology)|tissue]] seen in chronic pancreatitis may lead to:
**Increased [[pancreatic]] [[interstitial]] pressure
**Increased intraductal pressure and ductal hypertension<ref name="pmid1735346">{{cite journal |vauthors=Karanjia ND, Singh SM, Widdison AL, Lutrin FJ, Reber HA |title=Pancreatic ductal and interstitial pressures in cats with chronic pancreatitis |journal=Dig. Dis. Sci. |volume=37 |issue=2 |pages=268–73 |year=1992 |pmid=1735346 |doi= |url=}}</ref>
**Chronic [[ischemia]] and [[necrosis]] of [[Pancreas|pancreatic gland]]<ref name="pmid7514552">{{cite journal |vauthors=Tanaka T, Ichiba Y, Miura Y, Ito H, Dohi K |title=Canine model of chronic pancreatitis due to chronic ischemia |journal=Digestion |volume=55 |issue=2 |pages=86–9 |year=1994 |pmid=7514552 |doi= |url=}}</ref>
 
==== (e) Autoimmune disorders ====
*Chronic pancreatitis has been found to be associated with [[autoimmune]] conditions such as:<ref name="pmid7129026">{{cite journal |vauthors=Epstein O, Chapman RW, Lake-Bakaar G, Foo AY, Rosalki SB, Sherlock S |title=The pancreas in primary biliary cirrhosis and primary sclerosing cholangitis |journal=Gastroenterology |volume=83 |issue=6 |pages=1177–82 |year=1982 |pmid=7129026 |doi= |url=}}</ref><ref name="pmid8022761">{{cite journal |vauthors=Nishimori I, Yamamoto Y, Okazaki K, Morita M, Onodera M, Kino J, Tamura S, Yamamoto Y |title=Identification of autoantibodies to a pancreatic antigen in patients with idiopathic chronic pancreatitis and Sjögren's syndrome |journal=Pancreas |volume=9 |issue=3 |pages=374–81 |year=1994 |pmid=8022761 |doi= |url=}}</ref>
**[[Sjögren's syndrome]]
**[[Primary biliary cirrhosis]]
**[[Renal tubular acidosis]] 
*[[HLA-DR]] [[antigen]] expression with [[T-cell]] [[inflammatory]] infiltrate is seen on ductal cells in some cases of [[idiopathic]] chronic pancreatitis.<ref name="pmid3498162">{{cite journal |vauthors=Bovo P, Mirakian R, Merigo F, Angelini G, Cavallini G, Rizzini P, Bottazzo GF, Scuro LA |title=HLA molecule expression on chronic pancreatitis specimens: is there a role for autoimmunity? A preliminary study |journal=Pancreas |volume=2 |issue=3 |pages=350–6 |year=1987 |pmid=3498162 |doi= |url=}}</ref>
 
==== (f) Necrosis and fibrosis ====
* Recurrent attacks of [[acute pancreatitis]] may lead to chronic pancreatitis due to:<ref name="pmid12079262">{{cite journal |vauthors=Schneider A, Whitcomb DC |title=Hereditary pancreatitis: a model for inflammatory diseases of the pancreas |journal=Best Pract Res Clin Gastroenterol |volume=16 |issue=3 |pages=347–63 |year=2002 |pmid=12079262 |doi=10.1053/bega.2002.0311 |url=}}</ref><ref name="pmid19603011">{{cite journal |vauthors=Lankisch PG, Breuer N, Bruns A, Weber-Dany B, Lowenfels AB, Maisonneuve P |title=Natural history of acute pancreatitis: a long-term population-based study |journal=Am. J. Gastroenterol. |volume=104 |issue=11 |pages=2797–805; quiz 2806 |year=2009 |pmid=19603011 |doi=10.1038/ajg.2009.405 |url=}}</ref>
** [[Necrosis]]
** [[Fibrosis]]
** [[Scarring]] of [[Pancreas|pancreatic gland]]
** Intrinsic compression of the [[pancreatic]] ductules
*Progression from acute to chronic pancreatitis is dependent upon the number and severity of acute attacks<ref name="pmid8174996">{{cite journal |vauthors=Ammann RW, Muellhaupt B |title=Progression of alcoholic acute to chronic pancreatitis |journal=Gut |volume=35 |issue=4 |pages=552–6 |year=1994 |pmid=8174996 |pmc=1374808 |doi= |url=}}</ref>
 
==== (g) The sentinal acute pancreatitis event (SAPE) hypothesis: ====
* SAPE hypothesis explains the role of [[pancreatic]] stellate cells in chronic pancreatitis<ref name="pmid12079262">{{cite journal |vauthors=Schneider A, Whitcomb DC |title=Hereditary pancreatitis: a model for inflammatory diseases of the pancreas |journal=Best Pract Res Clin Gastroenterol |volume=16 |issue=3 |pages=347–63 |year=2002 |pmid=12079262 |doi=10.1053/bega.2002.0311 |url=}}</ref><ref name="pmid20125091">{{cite journal |vauthors=Yadav D, Whitcomb DC |title=The role of alcohol and smoking in pancreatitis |journal=Nat Rev Gastroenterol Hepatol |volume=7 |issue=3 |pages=131–45 |year=2010 |pmid=20125091 |doi=10.1038/nrgastro.2010.6 |url=}}</ref>
* It explains the [[pathogenesis]] of chronic pancreatitis as a continuum of 3 sequential changes:
** Pre-[[acute pancreatitis]]
*** Based on the assumption that chronic pancreatitis occurs in [[genetically]] or environmentally susceptible people or who are at increased risk
** The sentinel attack of [[acute pancreatitis]], which involves:
*** Triggering of [[chronic]] [[inflammation]] in the predisposed patients
*** Activation and recruitment of [[Stellate cell|stellate cells]]
** Progression phase, with [[immune system]] activation that ultimately resulting in:
*** Progression of [[inflammation]]
*** Irreversible changes
 
[[Image:PMC3274456 1755-1536-4-26-1.png|500 px|thumb|center|Source: nih.gov]]
 
==Genetics==
Genes involved in the pathogenesis of chronic pancreatitis include:
* [https://en.wikipedia.org/wiki/Cystic_fibrosis CFTR-Cystic fibrosis gene mutation]<ref name="pmid16193325">{{cite journal |vauthors=Bishop MD, Freedman SD, Zielenski J, Ahmed N, Dupuis A, Martin S, Ellis L, Shea J, Hopper I, Corey M, Kortan P, Haber G, Ross C, Tzountzouris J, Steele L, Ray PN, Tsui LC, Durie PR |title=The cystic fibrosis transmembrane conductance regulator gene and ion channel function in patients with idiopathic pancreatitis |journal=Hum. Genet. |volume=118 |issue=3-4 |pages=372–81 |year=2005 |pmid=16193325 |doi=10.1007/s00439-005-0059-z |url=}}</ref><ref name="pmid20416310">{{cite journal |vauthors=Ooi CY, Gonska T, Durie PR, Freedman SD |title=Genetic testing in pancreatitis |journal=Gastroenterology |volume=138 |issue=7 |pages=2202–6, 2206.e1 |year=2010 |pmid=20416310 |doi=10.1053/j.gastro.2010.04.022 |url=}}</ref>
* [[SPINK1|SPINK-1]], which encodes for trypsin inhibitor<ref name="pmid10835640">{{cite journal |vauthors=Witt H, Luck W, Hennies HC, Classen M, Kage A, Lass U, Landt O, Becker M |title=Mutations in the gene encoding the serine protease inhibitor, Kazal type 1 are associated with chronic pancreatitis |journal=Nat. Genet. |volume=25 |issue=2 |pages=213–6 |year=2000 |pmid=10835640 |doi=10.1038/76088 |url=}}</ref>
* [https://www.wikigenes.org/e/gene/e/5644.html PRSS-1 gene] linked to hereditary pancreatitis
* Claudin-2 ([[CLDN2]])<ref name="pmid23143602">{{cite journal |vauthors=Whitcomb DC, LaRusch J, Krasinskas AM, Klei L, Smith JP, Brand RE, Neoptolemos JP, Lerch MM, Tector M, Sandhu BS, Guda NM, Orlichenko L, Alkaade S, Amann ST, Anderson MA, Baillie J, Banks PA, Conwell D, Coté GA, Cotton PB, DiSario J, Farrer LA, Forsmark CE, Johnstone M, Gardner TB, Gelrud A, Greenhalf W, Haines JL, Hartman DJ, Hawes RA, Lawrence C, Lewis M, Mayerle J, Mayeux R, Melhem NM, Money ME, Muniraj T, Papachristou GI, Pericak-Vance MA, Romagnuolo J, Schellenberg GD, Sherman S, Simon P, Singh VP, Slivka A, Stolz D, Sutton R, Weiss FU, Wilcox CM, Zarnescu NO, Wisniewski SR, O'Connell MR, Kienholz ML, Roeder K, Barmada MM, Yadav D, Devlin B |title=Common genetic variants in the CLDN2 and PRSS1-PRSS2 loci alter risk for alcohol-related and sporadic pancreatitis |journal=Nat. Genet. |volume=44 |issue=12 |pages=1349–54 |year=2012 |pmid=23143602 |pmc=3510344 |doi=10.1038/ng.2466 |url=}}</ref>
* [[Carboxypeptidase A1]] ([[Carboxypeptidase A1|CPA1]]) [[genes]]<ref name="pmid23955596">{{cite journal |vauthors=Witt H, Beer S, Rosendahl J, Chen JM, Chandak GR, Masamune A, Bence M, Szmola R, Oracz G, Macek M, Bhatia E, Steigenberger S, Lasher D, Bühler F, Delaporte C, Tebbing J, Ludwig M, Pilsak C, Saum K, Bugert P, Masson E, Paliwal S, Bhaskar S, Sobczynska-Tomaszewska A, Bak D, Balascak I, Choudhuri G, Nageshwar Reddy D, Rao GV, Thomas V, Kume K, Nakano E, Kakuta Y, Shimosegawa T, Durko L, Szabó A, Schnúr A, Hegyi P, Rakonczay Z, Pfützer R, Schneider A, Groneberg DA, Braun M, Schmidt H, Witt U, Friess H, Algül H, Landt O, Schuelke M, Krüger R, Wiedenmann B, Schmidt F, Zimmer KP, Kovacs P, Stumvoll M, Blüher M, Müller T, Janecke A, Teich N, Grützmann R, Schulz HU, Mössner J, Keim V, Löhr M, Férec C, Sahin-Tóth M |title=Variants in CPA1 are strongly associated with early onset chronic pancreatitis |journal=Nat. Genet. |volume=45 |issue=10 |pages=1216–20 |year=2013 |pmid=23955596 |pmc=3909499 |doi=10.1038/ng.2730 |url=}}</ref>
 
==Associated Conditions==
* [[Autoimmune]] conditions:
** [[Primary biliary cirrhosis]]
** [[Primary sclerosing cholangitis]]
** [[Sjogren syndrome|Sjögren syndrome]]
 
* [[Renal tubular acidosis]]
 
==Gross Pathology==
*On [[gross examination]], following findings may be observed:
**Enlarged or [[atrophic]] [[pancreas]]
**[[Cysts]]
**[[Calcification|Calcifications]]
**[[Fibrosis]]
**Patchy focal [[necrosis]]
[[Image: Xanthogranulomatous pancreatitis.jpg|600 px|center|right|By Dr. Roshan Nasimudeen [CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0)], via Wikimedia Commons]]
[[Image: Chronic-pancreatitis-gross-pathology-1.jpeg|700 px|center|left|Case courtesy of Dr Henry Knipe, <a href="https://radiopaedia.org/">Radiopaedia.org</a>. From the case <a href="https://radiopaedia.org/cases/27870">rID: 27870</a>]]
 
==Microscopic Pathology==
*On [[microscopic]] [[histopathological]] analysis:
**Patchy focal disease characterized by a [[Mononuclear cells|mononuclear]] infiltrate
 
* Early phase findings:
** Increased amount of peri-ductal and inter-lobular [[connective tissue]]
** Minimal to moderate degree of [[inflammation]] (mostly [[T lymphocyte]])
** The [[islets of Langerhans]] are relatively spared
* Late phase findings:
** Increased amount of [[connective tissue]] between the [[acini]] causing their distortion and disappearance
** [[Connective tissue]] is replaced by [[fibrous tissue]]
** Involvement of  the [[islets of Langerhans]]
 
* [[Pancreatic]] [[lipomatosis]] may also be seen. It can be:
** Even
** Uneven
{| class="wikitable"
! align="center" style="background:#4479BA; color: #FFFFFF;" + |Type
! align="center" style="background:#4479BA; color: #FFFFFF;" + |Uneven pancreatic lipomatosis
|-
|Type 1a
|Preferential fatty replacement of head
|-
|Type 1b
|Preferential fatty replacement of head, neck and body
|-
|Type 2a
|Preferential fatty replacement of head and [[uncinate process]]
|-
|Type 2b
|Fatty replacement of most of pancreas except peribiliary region
|}
[[Image:Tryptic fat tissue necrosis in severe pancreatitis, HE 1.jpg|500 px|thumb|center|By Patho - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=29668664]]
[[Image:Tryptic fat tissue necrosis in severe pancreatitis, HE 2.jpg|500 px|thumb|center|By Patho - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=29668789]]
 
=== Staging according to pancreatic physiology: ===
{| class="wikitable"
! align="center" style="background:#4479BA; color: #FFFFFF;" + |Stage
! align="center" style="background:#4479BA; color: #FFFFFF;" + |Pancreatic physiology
|-
|A
|Normal secretory, exocrine, and endocrine function
|-
|B
|Secretory dysfunction (abnormal secretin stimulation test)
|-
|C
|Exocrine insufficiency (abnormal fecal elastase, steatorrhea, low serum trypsin)
|-
|D
|Endocrine insufficiency (abnormal fasting glucose, glycohemoglobin, glucose tolerance test)
|-
|E
|Both C & D
|-
|X
|Not classified/ unknown
|}


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==References==

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Overview

Chronic pancreatitis is a progressive inflammatory process leading to irreversible structural damage to the pancreas resulting in exocrine and endocrine dysfunction. The pathogenesis is still unclear and multifactorial. Decreased bicarbonate secretion and intrapancreatic activation of digestive enzymes is thought to play an important role in the pathogenesis of chronic pancreatitis. Other factors that are thought to play an important role in the pathogenesis of chronic pancreatitis may include intraductal plugging and obstruction, direct injury to pancreatic cells induced by toxins and toxic metabolites, antioxidants, ischemia, autoimmune disorders, the sentinal acute pancreatitis event (SAPE), necrosis and fibrosis. Genes involved in the pathogenesis of chronic pancreatitis include CFTR-cystic fibrosis gene mutation, SPINK-1 mutation, which encodes for trypsin inhibitor, PRSS-1 gene mutation linked to hereditary pancreatitis, claudin-2 (CLDN2), and carboxypeptidase A1 (CPA1) gene mutations. Associated conditions may include autoimmune conditions, primary biliary cirrhosis, primary sclerosing cholangitis, Sjögren syndrome, and renal tubular acidosis. Gross pathology may include enlarged or atrophic pancreas, cysts, calcifications, fibrosis and patchy focal necrosis. Microscopic histopathological analysis may show patchy focal disease characterized by a mononuclear infiltrate.

Pathophysiology

Chronic pancreatitis is a progressive inflammatory process leading to irreversible structural damage to the pancreas resulting in exocrine and endocrine dysfunction.[1] The pathogenesis is still unclear and multifactorial; but two mechanisms that play an important role in the pathogenesis of chronic pancreatitis, which are as follows:

Decreased bicarbonate secretion:

A decrease in bicarbonate secretion may be due to any of the following causes:

  • Protein hypersecretion resulting in proteinaceous ductal plugs leading to ductal blockage and obstruction[2]

Intrapancreatic activation of digestive enzymes:

By Robert Jaster [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons

Other factors that are thought to play an important role in the pathogenesis of chronic pancreatitis include:

(a) Intraductal plugging and obstruction

1) Proteinaceous ductal plugs
2) Intraductal obstruction due to other causes

(b) Direct injury to pancreatic cells induced by toxins and toxic metabolites

(c) Antioxidants

(d) Ischemia

(e) Autoimmune disorders

(f) Necrosis and fibrosis

(g) The sentinal acute pancreatitis event (SAPE) hypothesis:

Source: nih.gov

Genetics

Genes involved in the pathogenesis of chronic pancreatitis include:

Associated Conditions

Gross Pathology

By Dr. Roshan Nasimudeen [CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0)], via Wikimedia Commons
By Dr. Roshan Nasimudeen [CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0)], via Wikimedia Commons
Case courtesy of Dr Henry Knipe, <a href="https://radiopaedia.org/">Radiopaedia.org</a>. From the case <a href="https://radiopaedia.org/cases/27870">rID: 27870</a>
Case courtesy of Dr Henry Knipe, <a href="https://radiopaedia.org/">Radiopaedia.org</a>. From the case <a href="https://radiopaedia.org/cases/27870">rID: 27870</a>

Microscopic Pathology

Type Uneven pancreatic lipomatosis
Type 1a Preferential fatty replacement of head
Type 1b Preferential fatty replacement of head, neck and body
Type 2a Preferential fatty replacement of head and uncinate process
Type 2b Fatty replacement of most of pancreas except peribiliary region
By Patho - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=29668664
By Patho - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=29668789

Staging according to pancreatic physiology:

Stage Pancreatic physiology
A Normal secretory, exocrine, and endocrine function
B Secretory dysfunction (abnormal secretin stimulation test)
C Exocrine insufficiency (abnormal fecal elastase, steatorrhea, low serum trypsin)
D Endocrine insufficiency (abnormal fasting glucose, glycohemoglobin, glucose tolerance test)
E Both C & D
X Not classified/ unknown

References

  1. ↑ Steer ML, Waxman I, Freedman S (1995). "Chronic pancreatitis". N. Engl. J. Med. 332 (22): 1482–90. doi:10.1056/NEJM199506013322206. PMID 7739686.
  2. ↑ 2.0 2.1 Sahel J, Sarles H (1979). "Modifications of pure human pancreatic juice induced by chronic alcohol consumption". Dig. Dis. Sci. 24 (12): 897–905. PMID 510088.
  3. ↑ Freedman SD, Sakamoto K, Venu RP (1993). "GP2, the homologue to the renal cast protein uromodulin, is a major component of intraductal plugs in chronic pancreatitis". J. Clin. Invest. 92 (1): 83–90. doi:10.1172/JCI116602. PMC 293537. PMID 8326020.
  4. ↑ Guy O, Robles-Diaz G, Adrich Z, Sahel J, Sarles H (1983). "Protein content of precipitates present in pancreatic juice of alcoholic subjects and patients with chronic calcifying pancreatitis". Gastroenterology. 84 (1): 102–7. PMID 6401181.
  5. ↑ Apte MV, Pirola RC, Wilson JS (2010). "Mechanisms of alcoholic pancreatitis". J Gastroenterol Hepatol. 25 (12): 1816–26. doi:10.1111/j.1440-1746.2010.06445.x. PMID 21091991.
  6. ↑ Forsmark CE, Vege SS, Wilcox M (November 17,2016). "Acute Pancreatitis". The New England Journal of Medicine: 1972–1981. doi:10.1056/NEJMra1505202. Retrieved November 25,2016. Check date values in: |access-date=, |date= (help)
  7. ↑ Rose P, Fraine E, Hunt LP, Acheson DW, Braganza JM (1986). "Dietary antioxidants and chronic pancreatitis". Hum Nutr Clin Nutr. 40 (2): 151–64. PMID 3957720.
  8. ↑ Uden S, Acheson DW, Reeves J, Worthington HV, Hunt LP, Brown S, Braganza JM (1988). "Antioxidants, enzyme induction, and chronic pancreatitis: a reappraisal following studies in patients on anticonvulsants". Eur J Clin Nutr. 42 (7): 561–9. PMID 3224602.
  9. ↑ Braganza JM, Thomas A, Robinson A (1988). "Antioxidants to treat chronic pancreatitis in childhood? Case report and possible implications for pathogenesis". Int. J. Pancreatol. 3 (2–3): 209–16. doi:10.1007/BF02798933. PMID 3361161.
  10. ↑ Bhardwaj P, Garg PK, Maulik SK, Saraya A, Tandon RK, Acharya SK (2009). "A randomized controlled trial of antioxidant supplementation for pain relief in patients with chronic pancreatitis". Gastroenterology. 136 (1): 149–159.e2. doi:10.1053/j.gastro.2008.09.028. PMID 18952082.
  11. ↑ Burton F, Alkaade S, Collins D, Muddana V, Slivka A, Brand RE, Gelrud A, Banks PA, Sherman S, Anderson MA, Romagnuolo J, Lawrence C, Baillie J, Gardner TB, Lewis MD, Amann ST, Lieb JG, O'Connell M, Kennard ED, Yadav D, Whitcomb DC, Forsmark CE (2011). "Use and perceived effectiveness of non-analgesic medical therapies for chronic pancreatitis in the United States". Aliment. Pharmacol. Ther. 33 (1): 149–59. doi:10.1111/j.1365-2036.2010.04491.x. PMC 3142582. PMID 21083584.
  12. ↑ Karanjia ND, Singh SM, Widdison AL, Lutrin FJ, Reber HA (1992). "Pancreatic ductal and interstitial pressures in cats with chronic pancreatitis". Dig. Dis. Sci. 37 (2): 268–73. PMID 1735346.
  13. ↑ Tanaka T, Ichiba Y, Miura Y, Ito H, Dohi K (1994). "Canine model of chronic pancreatitis due to chronic ischemia". Digestion. 55 (2): 86–9. PMID 7514552.
  14. ↑ Epstein O, Chapman RW, Lake-Bakaar G, Foo AY, Rosalki SB, Sherlock S (1982). "The pancreas in primary biliary cirrhosis and primary sclerosing cholangitis". Gastroenterology. 83 (6): 1177–82. PMID 7129026.
  15. ↑ Nishimori I, Yamamoto Y, Okazaki K, Morita M, Onodera M, Kino J, Tamura S, Yamamoto Y (1994). "Identification of autoantibodies to a pancreatic antigen in patients with idiopathic chronic pancreatitis and Sjögren's syndrome". Pancreas. 9 (3): 374–81. PMID 8022761.
  16. ↑ Bovo P, Mirakian R, Merigo F, Angelini G, Cavallini G, Rizzini P, Bottazzo GF, Scuro LA (1987). "HLA molecule expression on chronic pancreatitis specimens: is there a role for autoimmunity? A preliminary study". Pancreas. 2 (3): 350–6. PMID 3498162.
  17. ↑ 17.0 17.1 Schneider A, Whitcomb DC (2002). "Hereditary pancreatitis: a model for inflammatory diseases of the pancreas". Best Pract Res Clin Gastroenterol. 16 (3): 347–63. doi:10.1053/bega.2002.0311. PMID 12079262.
  18. ↑ Lankisch PG, Breuer N, Bruns A, Weber-Dany B, Lowenfels AB, Maisonneuve P (2009). "Natural history of acute pancreatitis: a long-term population-based study". Am. J. Gastroenterol. 104 (11): 2797–805, quiz 2806. doi:10.1038/ajg.2009.405. PMID 19603011.
  19. ↑ Ammann RW, Muellhaupt B (1994). "Progression of alcoholic acute to chronic pancreatitis". Gut. 35 (4): 552–6. PMC 1374808. PMID 8174996.
  20. ↑ Yadav D, Whitcomb DC (2010). "The role of alcohol and smoking in pancreatitis". Nat Rev Gastroenterol Hepatol. 7 (3): 131–45. doi:10.1038/nrgastro.2010.6. PMID 20125091.
  21. ↑ Bishop MD, Freedman SD, Zielenski J, Ahmed N, Dupuis A, Martin S, Ellis L, Shea J, Hopper I, Corey M, Kortan P, Haber G, Ross C, Tzountzouris J, Steele L, Ray PN, Tsui LC, Durie PR (2005). "The cystic fibrosis transmembrane conductance regulator gene and ion channel function in patients with idiopathic pancreatitis". Hum. Genet. 118 (3–4): 372–81. doi:10.1007/s00439-005-0059-z. PMID 16193325.
  22. ↑ Ooi CY, Gonska T, Durie PR, Freedman SD (2010). "Genetic testing in pancreatitis". Gastroenterology. 138 (7): 2202–6, 2206.e1. doi:10.1053/j.gastro.2010.04.022. PMID 20416310.
  23. ↑ Witt H, Luck W, Hennies HC, Classen M, Kage A, Lass U, Landt O, Becker M (2000). "Mutations in the gene encoding the serine protease inhibitor, Kazal type 1 are associated with chronic pancreatitis". Nat. Genet. 25 (2): 213–6. doi:10.1038/76088. PMID 10835640.
  24. ↑ Whitcomb DC, LaRusch J, Krasinskas AM, Klei L, Smith JP, Brand RE, Neoptolemos JP, Lerch MM, Tector M, Sandhu BS, Guda NM, Orlichenko L, Alkaade S, Amann ST, Anderson MA, Baillie J, Banks PA, Conwell D, Coté GA, Cotton PB, DiSario J, Farrer LA, Forsmark CE, Johnstone M, Gardner TB, Gelrud A, Greenhalf W, Haines JL, Hartman DJ, Hawes RA, Lawrence C, Lewis M, Mayerle J, Mayeux R, Melhem NM, Money ME, Muniraj T, Papachristou GI, Pericak-Vance MA, Romagnuolo J, Schellenberg GD, Sherman S, Simon P, Singh VP, Slivka A, Stolz D, Sutton R, Weiss FU, Wilcox CM, Zarnescu NO, Wisniewski SR, O'Connell MR, Kienholz ML, Roeder K, Barmada MM, Yadav D, Devlin B (2012). "Common genetic variants in the CLDN2 and PRSS1-PRSS2 loci alter risk for alcohol-related and sporadic pancreatitis". Nat. Genet. 44 (12): 1349–54. doi:10.1038/ng.2466. PMC 3510344. PMID 23143602.
  25. ↑ Witt H, Beer S, Rosendahl J, Chen JM, Chandak GR, Masamune A, Bence M, Szmola R, Oracz G, Macek M, Bhatia E, Steigenberger S, Lasher D, Bühler F, Delaporte C, Tebbing J, Ludwig M, Pilsak C, Saum K, Bugert P, Masson E, Paliwal S, Bhaskar S, Sobczynska-Tomaszewska A, Bak D, Balascak I, Choudhuri G, Nageshwar Reddy D, Rao GV, Thomas V, Kume K, Nakano E, Kakuta Y, Shimosegawa T, Durko L, Szabó A, Schnúr A, Hegyi P, Rakonczay Z, Pfützer R, Schneider A, Groneberg DA, Braun M, Schmidt H, Witt U, Friess H, Algül H, Landt O, Schuelke M, Krüger R, Wiedenmann B, Schmidt F, Zimmer KP, Kovacs P, Stumvoll M, Blüher M, Müller T, Janecke A, Teich N, Grützmann R, Schulz HU, Mössner J, Keim V, Löhr M, Férec C, Sahin-Tóth M (2013). "Variants in CPA1 are strongly associated with early onset chronic pancreatitis". Nat. Genet. 45 (10): 1216–20. doi:10.1038/ng.2730. PMC 3909499. PMID 23955596.


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