Abstract
As compared with the pre-separated thymic lymphocyte (TL) population, a marked reduction of insulin binding was found in the two fractions [supernatant lymphocytes (SL) and precipitate lymphocytes (PL)] separated by low-speed differential centrifugation from the TL population. The reduction in insulin binding to SL or PL appeared to be due to a decrease in the affinity rather than a decrease in the number of insulin receptors. The reduced insulin binding was enhanced to near the level of the TL population when SL and PL were mixed and then incubated for 90 min at 37 degrees C. Moreover, when the cell-free supernatant from the mixed and incubated fraction was added to SL and PL respectively, the insulin binding to each fraction was found to be enhanced.
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