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We previously demonstrated that an alternative splicing may allow rapid induction of functional cold-inducible RNA-binding protein (CIRBP) in the hamster heart. The purpose of the present study was to determine the major cause of the alternative splicing in Syrian hamsters. RT-PCR analysis revealed that CIRBP mRNA is constitutively expressed in the heart, brain, lung, liver, and kidney of nonhibernating euthermic hamsters with several alternative splicing variants. In contrast, the short variant containing an open-reading frame for functional CIRBP was dominantly found in the hibernating animals. Keeping the animals in a cold and dark environment did not cause a shift in the alternative splicing. Induction of hypothermia by central administration of an adenosine A<jats:sub>1<\/jats:sub>-receptor agonist reproduced the shift in the splicing pattern. However, the agonist failed to shift the pattern when body temperature was kept at 37\u00b0C, suggesting that central adenosine A<jats:sub>1<\/jats:sub>receptors are not directly linked to the shift of the alternative splicing. Rapid reduction of body temperature to 10\u00b0C by isoflurane anesthesia combined with cooling did not alter the splicing pattern, but maintenance of mild hypothermia (~28\u00b0C) for 2 h elicited the shift in the pattern. The results suggest that animals need to be maintained at mild hypothermia for an adequate duration to induce the shift in the alternative splicing. This is applicable to natural hibernation because hamsters entering hibernation show a gradual decrease in body temperature, being maintained at mild hypothermia for several hours.<\/jats:p>","DOI":"10.1152\/ajpregu.00012.2019","type":"journal-article","created":{"date-parts":[[2019,6,12]],"date-time":"2019-06-12T18:13:36Z","timestamp":1560363216000},"page":"R240-R247","source":"Crossref","is-referenced-by-count":15,"title":["Mild hypothermia causes a shift in the alternative splicing of cold-inducible RNA-binding protein transcripts in Syrian hamsters"],"prefix":"10.1152","volume":"317","author":[{"given":"Yuuki","family":"Horii","sequence":"first","affiliation":[{"name":"Laboratory of Physiology, Department of Basic Veterinary Science, The United Graduate School of Veterinary Sciences, Gifu University, Gifu, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hiroki","family":"Shimaoka","sequence":"additional","affiliation":[{"name":"Laboratory of Physiology, 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