AI Article Synopsis
- Researchers identified immunoreactive somatostatin (IRS) in the male rat Harderian gland using radioimmunoassay techniques, showing consistent levels with purified standards.
- Despite hypophysectomy not affecting IRS levels, growth hormone treatment significantly increased them by 6-7 times, while isoproterenol decreased IRS content.
- The study also found that while nifedipine had no effect, verapamil successfully prevented the drop in IRS levels following isoproterenol administration, indicating a classical endocrine regulation of IRS in the Harderian gland.
Article Abstract
Immunoreactive somatostatin (IRS) was identified in the male rat Harderian gland (HG) by radioimmunoassay. Tissue was extracted and a displacement curve performed; there were no significant differences between values obtained with serial dilutions of extracted tissue and those from purified somatostatin standard used in the radioimmunoassay. Basal values of HG-IRS were found to be in the nanomolar range (10.8 +/- 3.5 ng IRS/mg protein). Hypophysectomy did not change the HG-IRS but, in vivo growth hormone (GH) treatment led to a dramatic increase (6-7-fold) in the levels of IRS in the HG. Isoproterenol, a beta-adrenergic agonist, when administered in vivo significantly decreased the HG-IRS content. The effect of two different calcium channel blockers on the isoproterenol-induced decrease of HG-IRS was studied; no changes were observed with nifedipine but verapamil, injected one hour after isoproterenol administration, prevented the drop in HG-IRS levels. These data demonstrate the existence of IRS in a new location, the rat Harderian gland, and support a classical endocrine regulation for its tissue concentration.
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| http://dx.doi.org/10.1016/0196-9781(88)90166-0 | DOI Listing |
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