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Abstract:
Type 2 and type 3 inositol 1,4,5-trisphosphate receptors (IP3R2and IP3R3) are intracellular calcium-release channels whosephysiological roles are unknown. We show exocrine dysfunctionin IP3R2 and IP3R3 double knock-out mice, which caused difficultiesin nutrient digestion. Severely impaired calcium signaling inacinar cells of the salivary glands and the pancreas in thedouble mutants ascribed the secretion deficits to a lack ofintracellular calcium release. Despite a normal caloric intake,the double mutants were hypoglycemic and lean. These resultsreveal IP3R2 and IP3R3 as key molecules in exocrine physiologyunderlying energy metabolism and animal growth.
1 Calcium Oscillation, International Cooperative Research Project, Japan Science and Technology Agency, Tokyo 108-0071, Japan. 2 Laboratory for Developmental Neurobiology, Brain Development Research Group, Brain Science Institute, RIKEN, Saitama 351-0198, Japan. 3 Division of Molecular Neurobiology, Institute of Medical Science, University of Tokyo, Tokyo 108-8639, Japan. 4 Department of Anatomy, School of Medicine, Hokkaido University, Sapporo 060-8638, Japan. 5 Department of Cell Biology, Japanese Foundation for Cancer Research, Cancer Institute, Tokyo 170-8455, Japan.
* To whom correspondence should be addressed. E-mail: afutatsu{at}brain.riken.jp (A.F.); mikosiba{at}ims.u-tokyo.ac.jp (K.M.)
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