Abstract:
:Ghrelin is an endogenous ligand of the growth hormone secretagogue receptor (GHS-R), which was originally isolated from rat stomach. Ghrelin and GHS-R are also expressed in several peripheral tissues, including adrenal glands, and this prompted us to study ghrelin expression and ghrelin-binding site localization in the human adrenal cortex, and the possible effect of this peptide on corticosteroid-hormone secretion. Reverse transcription-polymerase chain reaction (RT-PCR) and radioimmune assay (RIA) showed sizeable expression of ghrelin mRNA and protein in six human adrenal cortexes. Autoradiography evidenced abundant [125I]ghrelin binding sites in the adrenal zona glomerulosa and outer zona fasciculata. However, ghrelin (10(-6) M) did not significantly affect either basal or agonist (ACTH and angiotensin-II)-stimulated early and late steps of steroid-hormone synthesis from adrenocortical slices (as measured by quantitative high pressure liquid chromatography). Since zona glomerulosa is the cambium layer involved in the growth maintenance of adrenal cortex, the present coupled RT-PCR, RIA and autoradiographic findings could suggest the involvement of ghrelin in the autocrine-paracrine regulation of human adrenal growth.
journal_name
Int J Mol Medjournal_title
International journal of molecular medicineauthors
Tortorella C,Macchi C,Spinazzi R,Malendowicz LK,Trejter M,Nussdorfer GGsubject
Has Abstractpub_date
2003-08-01 00:00:00pages
213-7issue
2eissn
1107-3756issn
1791-244Xjournal_volume
12pub_type
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