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The role of Rab5a GTPase in endocytosis and post-endocytic trafficking of the hCG-human luteinizing hormone receptor complex

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Abstract

This study examined the role of Rab5a GTPase in regulating hCG-induced internalization and trafficking of the hCG-LH receptor complex in transfected 293T cells. Coexpression of wild-type Rab5a (WT) or constitutively active Rab5a (Q79L) with LHR significantly increased hCG-induced LHR internalization. Conversely, coexpression of dominant negative Rab5a (S34N) with LHR reduced internalization. Confocal microscopy showed LHR colocalizing with Rab5a (WT) and Rab5a (Q79L) in punctuate structures. Coexpression of Rab5a (WT) and Rab5a (Q79L) with LHR significantly increased colocalization of LHR in early endosomes. Conversely, dominant negative Rab5a (S34N) decreased this colocalization. While Rab5a stimulated internalization of LHR, it significantly decreased LHR recycling to the cell surface and increased degradation. Dominant negative Rab5a (S34N) increased LHR recycling and decreased degradation. These results suggest that Rab5a plays a role in LHR trafficking by facilitating internalization and fusion to early endosomes, increasing the degradation of internalized receptor resulting in a reduction in LHR recycling.

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Acknowledgments

This work was supported by National Institutes of Health grant R37 HD06656. We are grateful to Helle Peegel and other members of the laboratory for critical reading of the manuscript and many helpful suggestions. The confocal microscopic studies described here utilized the Morphology and Image Analysis Core (MIAC) facility at the University of Michigan Diabetes Research and training center.

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Authors and Affiliations

  1. Departments of Obstetrics and Gynecology and Biological Chemistry, University of Michigan Medical School, University of Michigan, 6428 Medical Science I, 1301 Catherine Street, Ann Arbor, MI, 48109-0617, USA

    Thippeswamy Gulappa, Christine L. Clouser & K. M. J. Menon

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  1. Thippeswamy Gulappa
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  2. Christine L. Clouser
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  3. K. M. J. Menon
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Correspondence to K. M. J. Menon.

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T. Gulappa and C. L. Clouser contributed equally to this work.

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Gulappa, T., Clouser, C.L. & Menon, K.M.J. The role of Rab5a GTPase in endocytosis and post-endocytic trafficking of the hCG-human luteinizing hormone receptor complex. Cell. Mol. Life Sci. 68, 2785–2795 (2011). https://doi.org/10.1007/s00018-010-0594-1

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  • DOI: https://doi.org/10.1007/s00018-010-0594-1

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