Activation of CCK-A receptors induces elevation of plasma corticosterone in rats. |
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Authors: | G Katsuura N Ibii A Matsushita |
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Institution: | Shionogi Research Laboratories, Sagisu, Osaka, Japan. |
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Abstract: | Cholecystokinin octapeptide (CCK-8) and ceruletide (1 microgram/kg) produced a pronounced increment of plasma corticosterone levels at 30 min after intraperitoneal administration. The response to these peptides was suppressed by pretreatment with a selective antagonist for CCK-A receptors, (-)L-364,718, in a dose-related manner, but not with an antagonist for CCK-B receptors, (+)L-365,260. However, (-)L-364,718 itself had no effect on basal levels of plasma corticosterone. These results indicate that peripheral administration of CCK-8 and ceruletide stimulates the hypothalamo-pituitary adrenal axis through the activation of CCK-A receptors, but not CCK-B receptors. |
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