TY - JOUR
T1 - Regional concentrations of insulin in the rat brain
AU - Baskin, Denis G.
AU - Porte, Daniel
AU - Guest, Karen
AU - Dorsa, Daniel M.
PY - 1983/3
Y1 - 1983/3
N2 - Recent evidence that insulin receptors are concentrated in the hypothalamus and olfactory bulb suggests that insulin may have an important regulatory function in these regions. This hypothesis would be supported by finding that insulin itself is concentrated in the hypothalamus and olfactory bulb. Therefore, we extracted the hypothalamus and olfactory bulb, as well as the amygdala, hippocampus, cerebral cortex, hindbrain, midbrain, and whole brains, of fasted male Wistar rats and measured immunoreactive insulin (IRI). Recovery of insulin added to extraction volumes of 500–1000 μl was 90– 100%, whereas recovery of insulin from tissue extracts was 63%. Mean IRI concentrations were relatively uniform throughout the brain (0.19 ng/g wet wt; uncorrected for recoverv) and were significanly lower than plasma levels (1.03 ng/ml). Nevertheless, IRI concentrations were significantly higher in hypothalamus (0.39 ± 0.02 ng/g; P < 0.01) and olfactory bulb (0.37 ± 0.0 ng/g; P < 0.05) compared to those in other brain regions sampled.
AB - Recent evidence that insulin receptors are concentrated in the hypothalamus and olfactory bulb suggests that insulin may have an important regulatory function in these regions. This hypothesis would be supported by finding that insulin itself is concentrated in the hypothalamus and olfactory bulb. Therefore, we extracted the hypothalamus and olfactory bulb, as well as the amygdala, hippocampus, cerebral cortex, hindbrain, midbrain, and whole brains, of fasted male Wistar rats and measured immunoreactive insulin (IRI). Recovery of insulin added to extraction volumes of 500–1000 μl was 90– 100%, whereas recovery of insulin from tissue extracts was 63%. Mean IRI concentrations were relatively uniform throughout the brain (0.19 ng/g wet wt; uncorrected for recoverv) and were significanly lower than plasma levels (1.03 ng/ml). Nevertheless, IRI concentrations were significantly higher in hypothalamus (0.39 ± 0.02 ng/g; P < 0.01) and olfactory bulb (0.37 ± 0.0 ng/g; P < 0.05) compared to those in other brain regions sampled.
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U2 - 10.1210/endo-112-3-898
DO - 10.1210/endo-112-3-898
M3 - Article
C2 - 6337049
AN - SCOPUS:0020729686
SN - 0013-7227
VL - 112
SP - 898
EP - 903
JO - Endocrinology
JF - Endocrinology
IS - 3
ER -