Abstract:
:BIM 23014 is a somatostatin analog displaying an increased biological half life due to resistance to enzymatic degradation. This peptide inhibits GH release directly at the level of pituitary somatotrophs. In addition, an action of BIM 23014 at the level of the hypothalamus is possible since somatostatinergic fibers and receptors have been identified on GH-RH neurons. To evaluate the effect of BIM 23014 on GH-RH secretion, hypophysial portal blood (HPB) was continuously collected in conscious sheep. Twelve rams (40-45 kg, 9-month-old) with chronically implanted perihypophysial cannulae were i.v. injected with BIM 23014 (1 mg) or saline. HPB and jugular blood were collected for 3-5 hours before and after the injection for the determinations of GH-RH and GH concentrations respectively. The acute injection of BIM 23014 induced a rapid decrease of plasma GH within the first two hours. Simultaneously, GH-RH in HPB decreased significantly. After reaching a nadir, GH concentrations increased to values greater than baseline. A similar rebound in GH-RH levels in HPB was also observed. These data indicate that BIM 23014 acts at the level of GH-RH hypothalamic neurons, in addition to its well-know effect on the pituitary gland.
journal_name
Life Scijournal_title
Life sciencesauthors
Magnan E,Cataldi M,Guillaume V,Conte-Devolx B,Graziani N,Figaroli JC,Thomas F,Chihara K,Oliver Cdoi
10.1016/0024-3205(92)90610-2subject
Has Abstractpub_date
1992-01-01 00:00:00pages
831-8issue
11eissn
0024-3205issn
1879-0631pii
0024-3205(92)90610-2journal_volume
51pub_type
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