Hereditary pancreatitis pathophysiology

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Iqra Qamar M.D.[2]

Overview

Hereditary pancreatitis is caused by genetic mutations in the regulatory regions present on trypsin. Mutations in PRSS1, SPINK1CTRC, and CFTR gene result in weakening of defense mechanisms against pancreatitis. Defense mechanisms against pancreatitis include control of trypsin activity via prevention of premature activation of trypsinogen to trypsin and destruction, inhibition, or elimination of trypsin from the pancreas. Premature activation of digestive enzymes resulting in pancreatic injury, immune system activation, acute pancreatitis, and chronic pancreatitis. Hereditary pancreatitis may be associated with Shwachman-Diamond syndrome (SDS), Pearson marrow pancreas syndrome, CEL maturity-onset diabetes of the young (CEL-MODY) and Johanson-Blizzard syndrome. Gross examination may show enlarged or atrophic pancreas, cysts, calcifications and fibrosis. On microscopic histopathological analysis, non-invasive dysplastic intraductal lesions, called pancreatic intraepithelial neoplasia (PanIN), may be noticed.

Pathophysiology

Hereditary pancreatitis is defined as EITHER two or more individuals with pancreatitis in two or more generations of a family (i.e., an autosomal dominant pattern of inheritance) OR Pancreatitis associated with a known germline pathogenic variant.[1]

Pathogenesis:

Regulatory regions of trypsin:

  • There are two regulatory regions present on trypsin
  • Almost all of the genetic mutations associated with hereditary pancreatitis are clustered in these 2 regulatory regions
(a) Regulatory region on the activation site 
  • It regulates the activation site
  • It converts trypsinogen into trypsin
(b) Regulatory region on the autolysis site 
  • It regulates the autolysis site
  •  It causes destruction of trypsin

Abnormal regulation of trypsin:

  • Mutations in PRSS1, SPINK1CTRC, and CFTR gene result in weakening of defense mechanisms against pancreatitis.[2] [3][4]
  • Defense mechanisms against pancreatitis include control of trypsin activity via:
    • Prevention of premature activation of trypsinogen to trypsin
    • Destruction, inhibition, or elimination of trypsin from the pancreas

Mutations at different sites on PRSS1 gene:

Mode of inheritance:

Mode of inheritance Genes involved
Autosomal dominant  Serine protease 1 gene (PRSS1)
Autosomal recessive Serine protease inhibitor Kazal type 1 gene (SPINK1, also called pancreatic secretory trypsin inhibitor gene)
Complex genetics A combination of genetic and environmental factors

Genetics

Hereditary pancreatitis involves mutations in the following genes:

Mutations in PRSS1 gene:
Mutations in SPINK1 gene:
Mutations in CFTR  gene:

[34][35][36][37]

Mutations in CTRC gene:
  • The chymotrypsin C gene (CTRC) encodes for Chymotrypsin C, that is a digestive enzyme, that helps in trypsin degradation.
  • Mutations in CTRC gene are found to be associated with chronic hereditary pancreatitis.[17][38][39][40][41]
Mutations in other genes:
  • Two additional genes have been found to be associated with hereditary pancreatitis.
    • CLDN2, associated with chronic alcoholic pancreatitis.[42][43][44]
    • CPA1, associated with nonalcoholic chronic pancreatitis, especially with early age of onset.[45]
Common mutations:
Protective genetic variants:
  • There are 2 genetic variants that have been found to play an important role in protecting against pancreatitis. They include:

Associated Conditions

Hereditary pancreatitis may be associated with following syndromes:

Gross Pathology

Microscopic Pathology

  • On microscopic histopathological analysis, non-invasive dysplastic intraductal lesions, called pancreatic intraepithelial neoplasia (PanIN), may be noticed.
  • Pancreatic intraepithelial neoplasia (PanIN) lesions, are precursors of infiltrating ductal carcinoma.
  •  PanINs are thought to progress from low grade dysplasia to high grade dysplasia.
    • Low grade dysplasia (PanIN-1A and PanIN-1B)
    • Moderate dysplasia (PanIN-2)
    • High grade dysplasia and or carcinoma in situ (PanIN-3)

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