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Insulin binding and glucose uptake of adipocytes in rats adapted to hypergravitational forceRats were exposed to 4.15 g for 1 yr and weight and age matched, and lean noncentrifuged rats were used as control groups. Rats exposed to chronic hypergravity (hypergravic rats) were found to show lower ambient insulin levels, greater food intake with smaller body weight gain, and decreased size of isolated adipocytes. The ability of adipocytes from the hypergravic rats to bind insulin was increased. With Scatchard analysis, both number and affinity of receptors were increased. In contrast to the increased binding, glucose transport was found to be decreased in adipocytes from these animals. However, when the data were expressed as a percentage of maximal effect, the half maximal insulin effect for both the hypergravic and lean control groups was produced at an insulin concentration of 0.23 + or - 0.02 ng/ml, which was lower than the insulin concentration of 0.31 + or - 0.02 ng/ml for the weight-matched control group (P less than 0.05). This increased insulin sensitivity in the hypergravic group was accounted for by an increased number of receptors.
Document ID
19800051581
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kobayashi, M.
(NASA Ames Research Center Moffett Field, CA, United States)
Mondon, C. E.
(NASA Ames Research Center Moffett Field, CA, United States)
Oyama, J.
(NASA Ames Research Center Biomedical Research Div., Moffett Field; Stanford University, Palo Alto, Calif., United States)
Date Acquired
August 10, 2013
Publication Date
April 1, 1980
Publication Information
Publication: American Journal of Physiology
Volume: 238
Subject Category
Life Sciences (General)
Accession Number
80A35751
Funding Number(s)
CONTRACT_GRANT: NIH-AM-07217
Distribution Limits
Public
Copyright
Other

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