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. 1998 Feb 15;330(Pt 1):405–411. doi: 10.1042/bj3300405

Possible role for gp160 in constitutive but not insulin-stimulated GLUT4 trafficking: dissociation of gp160 and GLUT4 localization.

A Filippis 1, S Clark 1, J Proietto 1
PMCID: PMC1219154  PMID: 9461537

Abstract

GLUT4-containing vesicles are constantly cycling in both basal and insulin-stimulated states. Our previous studies have shown that basal cycling of GLUT4 is impaired under conditions of high glucose or glucosamine and, as a consequence, GLUT4 is retained intracellularly in low-density microsomes [Filippis A., Clark, S., and Proietto, J. (1997) Biochem. J. 324, 981-985]. In addition to GLUT4 itself, a major protein component of GLUT4-containing vesicles is a glycoprotein of Mr 160000 (gp160). In all studies so far published gp160 has been co-localized with GLUT4 under all conditions. In this study, we show that retention of GLUT4 in low-density microsomes (enriched in Golgi apparatus) is associated with a decrease in gp160 levels in this compartment. A concomitant increase of gp160 in high-density microsomes (enriched in endoplasmic reticulum), demonstrates for the first time a dissociation in the localization of gp160 and GLUT4. Despite the marked decrease in gp160 levels in the GLUT4-containing compartment, insulin-stimulated translocation was normal, while little gp160 appeared in the plasma membrane in response to insulin. The retention of gp160 in the high-density microsomes is apparently not due to a change in the glycosylation state of gp160 as measured by [3H]mannose incorporation. It is concluded that, in rat adipocytes, gp160 is not required for insulin-stimulated translocation, but may be necessary for constitutive trafficking of the GLUT4-containing vesicle.

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