Effects of fluorescein isothiocyanate on insulin actions in rat adipocytes.

Abstract:

:The effects of fluorescein isothiocyanate II (FITC) on the actions of insulin in rat adipocytes were studied. When adipocytes were incubated with FITC at pH 7.4 (2 mM agent, 8 min), the cells were completely deprived of their specific insulin-binding activity and rendered unresponsive to the hormone. The effect of FITC on the insulin-binding activity was milder at pH 9.0, and cAMP phosphodiesterase in cells exposed to FITC at pH 9.0 was maximally stimulated if the insulin concentration was increased to 100 nM. Under identical conditions, however, glucose transport activity was rendered not only less sensitive but also less responsive to the hormone. When FITC was added to cells after insulin at pH 9.0, the glucose transport activity that had been stimulated by the hormone was considerably reduced. This reduction was largely, but not entirely, prevented if the cells were deprived of ATP, suggesting that FITC (a) elicited the ATP-dependent reversal of the hormonal effect and, simultaneously, (b) mildly inhibited the transport activity per se. Western blot assay of GLUT-4 (a major isoform of glucose transporter in adipocytes) indicated that FITC (a) partially blocked insulin-dependent translocation of GLUT-4 from the intracellular site to the plasma membrane while it (b) induced a mild "insulin-like" effect. It is concluded that FITC at pH 9.0 (a) renders both glucose transport and phosphodiesterase activities less insulin sensitive presumably by modifying the cellular hormone receptor and (b) makes glucose transport activity less responsive to insulin presumably by (i) blocking hormone-dependent translocation of glucose transporter and (ii) mildly inhibiting intrinsic glucose transport activity.

journal_name

Arch Biochem Biophys

authors

Goto Y,Sumida Y,Flanagan JE,Robinson FW,Simpson IA,Cushman SW,Kono T

doi

10.1016/0003-9861(92)90389-e

subject

Has Abstract

pub_date

1992-03-01 00:00:00

pages

224-30

issue

2

eissn

0003-9861

issn

1096-0384

pii

0003-9861(92)90389-E

journal_volume

293

pub_type

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