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- W2212497913 abstract "The effects of norepinephrine and insulin on glucose transport were investigated in brown adipocytes isolated from obese nondiabetic Lister and Albany (LA/N-cp strain) rats (O-LA), obese diabetic spontaneously hypertensive (SHR/N-cp strain) rats (O-SHR), and from their lean (L) controls to test whether the decreased calorigenic response to norepinephrine of O-SHR adipocytes was specifically associated with alterations in glucose metabolism. Norepinephrine and insulin independently stimulated glucose transport in L-LA, O-LA, and L-SHR brown adipocytes, but their stimulatory effects were markedly reduced in O-SHR cells. Both insulin responsiveness and the total number of insulin receptors were significantly decreased in O-SHR adipocytes but not in O-LA cells. The number of high-affinity beta 1/beta 2-adrenoceptors was significantly increased (+70%) in O-LA adipocytes but was similar in L-SHR and O-SHR cells. These results indicate that 1) major metabolic defects are present in brown adipose tissue (BAT) of O-SHR but not of O-LA, although these two strains are homozygous for the cp allele, 2) postreceptor defects are predominantly involved in O-SHR adipocyte refractoriness to norepinephrine, and 3) a reduced mitochondrial content may represent the principal metabolic alteration explaining the decreased effects of norepinephrine on both thermogenesis and glucose transport. It is postulated that the marked insulin resistance of O-SHR leads to a decreased mitochondriogenesis in BAT, resulting in a diminished tissue thermogenic capacity and reduced glucose metabolism, thereby contributing to obesity and diabetes." @default.
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- W2212497913 date "1993-09-01" @default.
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- W2212497913 title "Norepinephrine- and insulin-resistant glucose transport in brown adipocytes from diabetic SHR/N-cp rats" @default.
- W2212497913 doi "https://doi.org/10.1152/ajpregu.1993.265.3.r577" @default.
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