Altered cholecystokinin-induced calcium signal in streptozotocin-induced diabetic rat pancreatic acini

Myung Jun Kim, Gyeong Ryul Ryu, Jong Ho Sung, Do Sik Min, Duck Joo Rhie, Shin Hee Yoon, Sang June Hahn, Yang Hyeok Jo, Myung Suk Kim

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Abstract

BACKGROUND/AIMS: Pancreatic acini of streptozotocin (STZ)-induced diabetic rats release amylase less than normal acini on cholecystokinin (CCK) stimulation. Pancreatic enzyme secretion has been closely related to the intracellular calcium concentration ([Ca2(+)](i)) of the acinar cell. In the present study, sequential changes of the intracellular calcium signal which probably underlie the altered enzyme secretion in response to CCK-8 were investigated using pancreatic acini from diabetic rats. METHODS: Diabetic rats were prepared by single intravenous injection of STZ (70 mg/kg). Stimulating experiments with CCK-8 were performed 7 days later. Pancreatic acini were isolated by collagenase digestion. Amylase release and [Ca2(+)](i) were measured by colorimethod and calcium imaging, respectively. The geometry of intracellular calcium signal was analyzed. RESULTS: Normal acini exhibited concentration-dependent [Ca2(+)](i) increase and regular oscillatory calcium signal on CCK-8 stimulation. Amylase release was also concentration-dependent. However, diabetic acini showed significantly less [Ca2(+)](i) increase, prolonged time to peak [Ca2(+)](i), decreased calcium spikes number, and decreased amylase release compared with normal acini. The decreased [Ca2(+)](i) in diabetic acini was restored significantly by insulin treatment. CONCLUSIONS: Relatively decreased amylase release in diabetic pancreatic acini in response to CCK, appears to be associated with altered calcium signal due to insulin deficiency.

Original languageEnglish
Pages (from-to)519-526
Number of pages8
JournalThe Korean journal of gastroenterology = Taehan Sohwagi Hakhoe chi
Volume42
Issue number6
Publication statusPublished - 2003 Dec

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All Science Journal Classification (ASJC) codes

  • Medicine(all)

Cite this

Kim, M. J., Ryu, G. R., Sung, J. H., Min, D. S., Rhie, D. J., Yoon, S. H., Hahn, S. J., Jo, Y. H., & Kim, M. S. (2003). Altered cholecystokinin-induced calcium signal in streptozotocin-induced diabetic rat pancreatic acini. The Korean journal of gastroenterology = Taehan Sohwagi Hakhoe chi, 42(6), 519-526.