Gerasimenko, Julia Vladimirovna ![]() ![]() ![]() |
Abstract
Toxic alcohol effects on pancreatic acinar cells, causing the often fatal human disease acute pancreatitis, are principally mediated by fatty acid ethyl esters (non-oxidative products of alcohol and fatty acids), emptying internal stores of Ca2+. This excessive Ca2+ liberation induces Ca2+-dependent necrosis due to intracellular trypsin activation. Our aim was to identify the specific source of the Ca2+ release linked to the fatal intracellular protease activation. In 2-photon permeabilized mouse pancreatic acinar cells, we monitored changes in the Ca2+ concentration in the thapsigargin-sensitive endoplasmic reticulum (ER) as well as in a bafilomycin-sensitive acid compartment, localized exclusively in the apical granular pole. We also assessed trypsin activity in the apical granular region. Palmitoleic acid ethyl ester (POAEE) elicited Ca2+ release from both the ER as well as the acid pool, but trypsin activation depended predominantly on Ca2+ release from the acid pool, that was mainly mediated by functional inositol 1,4,5- trisphosphate receptors (IP3Rs) of types 2 and 3. POAEE evoked very little Ca2+ release and trypsin activation when IP3Rs of both types 2 and 3 were knocked out. Antibodies against IP3Rs of types 2 and 3, but not type 1, markedly inhibited POAEE-elicited Ca2+ release and trypsin activation. We conclude that Ca2+ release through IP3Rs of types 2 and 3 in the acid granular Ca2+ store induces intracellular protease activation, and propose that this is a critical process in the initiation of alcohol-related acute pancreatitis.
Item Type: | Article |
---|---|
Date Type: | Publication |
Status: | Published |
Schools: | Schools > Biosciences Research Institutes & Centres > Systems Immunity Research Institute (SIURI) |
Subjects: | Q Science > QP Physiology Q Science > QR Microbiology |
Uncontrolled Keywords: | Calcium; inositol trisphopshate receptors; pancreatitis |
Publisher: | National Academy of Sciences |
ISSN: | 0027-8424 |
Last Modified: | 02 Dec 2022 11:58 |
URI: | https://orca.cardiff.ac.uk/id/eprint/9131 |
Citation Data
Cited 85 times in Scopus. View in Scopus. Powered By Scopus® Data
Actions (repository staff only)
![]() |
Edit Item |