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- W2048268520 abstract "In order to evaluate the release of somatostatin (SRIF) and growth hormone-releasing factor (GRF) into the pituitary gland in response to ether stress, a push-pull perifusion (PPP) technique has been used in freely moving rats. Push-pull cannulae (PPC) were implanted into the anterior pituitary (AP) glands of male rats. After a 7-day recovery period the rats were fitted with indwelling jugular catheters. The next day the animals were subjected to PPP of the AP during 1 h followed by ether stress (2 min) and another hour of perifusion. The perifusion flow was 20 microliters/min and 10-min fractions were collected and assayed for SRIF and GRF by RIA. Plasma growth hormone (GH) levels were assayed every 10 min. At the end of the experiments, the accuracy of PPC tip placements was ascertained with a dissecting microscope. Under basal conditions there were 2.9 pulses/h of SRIF with an amplitude of 12.76 +/- 0.46 pg. The output of SRIF and GRF in the 10-min period beginning with application of ether was increased 2-fold (p less than 0.005 and p less than 0.01, respectively). Interestingly, the increased release of SRIF continued for an additional 10 min, whereas GRF output decreased and was almost undetectable. The release of both GRF and SRIF had returned to basal values 20-30 min after stress. Mean plasma GH levels were significantly lowered 10 min after stress. Each of the 9 animals showed a restoration of pulsatile GH release to basal levels within 20-30 min after stress. Our findings provide compelling evidence that SRIF plays a prominent role in stress-induced inhibition of GH release in the rat by blocking the response to the transient elevation of GRF and continuing to suppress GH release for 20 min." @default.
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- W2048268520 date "1991-01-01" @default.
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- W2048268520 title "Roles of Somatostatin and Growth Hormone-Releasing Factor in Ether Stress Inhibition of Growth Hormone Release" @default.
- W2048268520 doi "https://doi.org/10.1159/000125946" @default.
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