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Organ-specific stress induces mouse pancreatic keratin overexpression in association with NF-kappaB activation.
- Source :
-
Journal of cell science [J Cell Sci] 2004 Apr 01; Vol. 117 (Pt 9), pp. 1709-19. - Publication Year :
- 2004
-
Abstract
- Keratin polypeptides 8 and 18 (K8/K18) are the major intermediate filament proteins of pancreatic acinar cells and hepatocytes. Pancreatic keratin function is unknown, whereas hepatocyte keratins protect from mechanical and non-mechanical forms of stress. We characterized steady-state pancreatic keratin expression in Balb/c mice after caerulein and choline-deficient ethionine-supplemented diet (CDD), or on exposure to the generalized stresses of heat and water immersion. Keratins were studied at the protein, RNA and organizational levels. Isolated acini were used to study the role of nuclear factor (NF)-kappaB using selective inhibitors. Keratins were found to be abundant proteins making up 0.2%, 0.3% and 0.5% of the total cellular protein of pancreas, liver and small intestine, respectively. Caerulein and CDD caused a threefold transcription-mediated overall increase in K8/K18/K19/K20 proteins. Keratin overexpression begins on tissue recovery, peaks 2 days after caerulein injection, or 1 day after CDD discontinuation, and returns to basal levels after 10 days. K19/K20-containing cytoplasmic filaments are nearly absent pre-injury but form post-injury then return to their original membrane-proximal distribution after 10 days. By contrast, generalized stresses of heat or water-immersion stress do not alter keratin expression levels. Caerulein-induced keratin overexpression is associated with NF-kappaB activation when tested using ex vivo acinar cell cultures. In conclusion, keratins are abundant proteins that can behave as stress proteins in response to tissue-specific but not generalized forms of injury. Pancreatic keratin overexpression is associated with NF-kappaB activation and may serve unique functions in acinar or ductal cell response to injury.
- Subjects :
- Animals
Ceruletide pharmacology
Choline Deficiency
Diet
Ethionine pharmacology
Fever genetics
Fever metabolism
Intestine, Small metabolism
Liver metabolism
Mice
Mice, Inbred BALB C
Organ Specificity
Pancreas drug effects
Pancreatitis chemically induced
Pancreatitis genetics
Pancreatitis metabolism
Pancreatitis pathology
RNA, Messenger metabolism
Transcriptional Activation drug effects
Water pharmacology
Gene Expression Regulation
Hot Temperature
Keratins genetics
Keratins metabolism
NF-kappa B metabolism
Pancreas metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 0021-9533
- Volume :
- 117
- Issue :
- Pt 9
- Database :
- MEDLINE
- Journal :
- Journal of cell science
- Publication Type :
- Academic Journal
- Accession number :
- 15075232
- Full Text :
- https://doi.org/10.1242/jcs.01016