Abstract:
:Cerebellin (CER) is a regulatory peptide, originally isolated from rat cerebellum, which derives from the cleavage of precerebellin (Cbln), three types of which (Cbln1-3) have been identified in humans and rats. CER is also expressed in several extra-cerebellar tissues, including adrenal gland, and evidence has been provided that CER exerts a modulatory action on human and rat adrenal gland. Hence, we have investigated the expression of Cbln1-3 mRNAs and CER protein-immunoreactivity (IR) in the various zones of rat adrenal glands, and the effects of CER and its metabolite [des-Ser(1)]CER (des-CER) on the secretion and growth of cultured rat adrenocortical cells. Reverse transcription-polymerase chain reaction showed high and low expression of Cbln2 mRNA in zona glomerulosa (ZG) and zona fasciculata-reticularis, respectively. Cbln1 was not expressed, and Cbln3 mRNA was detected only in ZG. No Cbln expression was found in adrenal medulla. Immunocytochemistry demonstrated the presence of CER-IR exclusively in the adrenal cortex, the reaction being more intense in ZG. As expected, ACTH (10(-8) M) markedly enhanced corticosterone secretion and lowered proliferation rate of cultured adrenocortical cells. CER was ineffective, while des-CER exerted an ACTH-like effect, but only at the lowest concentration (10(-10) M). Taken together, these findings allow us to conclude that CER is expressed in rat adrenal cortex, and to suggest that CER conversion to des-CER by endopeptidases is needed for CER to exert its autocrine-paracrine regulatory functions.
journal_name
Int J Mol Medjournal_title
International journal of molecular medicineauthors
Rucinski M,Albertin G,Spinazzi R,Ziolkowska A,Nussdorfer GG,Malendowicz LKsubject
Has Abstractpub_date
2005-03-01 00:00:00pages
411-5issue
3eissn
1107-3756issn
1791-244Xjournal_volume
15pub_type
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