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Am J Physiol Renal Physiol 280: F283-F290, 2001;
0363-6127/01 $5.00
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Vol. 280, Issue 2, F283-F290, February 2001

NHE3 activity and trafficking depend on the state of actin organization in proximal tubule

C. Chalumeau1, D. Du Cheyron1, N. Defontaine1, O. Kellermann3, M. Paillard1,2, and J. Poggioli1

1 Institut National de la Santé et de la Recherche Médicale Unité 356, Institut Fédératif de Recherche 58; 2 Université Paris VI, Hôpital Broussais, Assistance Publique; and 3 Institut Pasteur, Laboratoire de Différenciation Cellulaire, Paris, France

The present study was addressed to define the contribution of cytoskeleton elements in the kidney proximal tubule Na+/H+ exchanger 3 (NHE3) activity under basal conditions. We used luminal membrane vesicles (LMV) isolated from suspensions of rat cortical tubules pretreated with either colchicine (Colch) or cytochalasin D (Cyto D). Colch pretreatment of suspensions (200 µM for 60 min) moderately decreased LMV NHE3 activity. Cyto D pretreatment (1 µM for 60 min) elicited an increase in LMV NHE3 transport activity but did not increase Na-glucose cotransport activity. Cyto D pretreatment of suspensions did not change the apparent affinity of NHE3 for internal H+. In contrast, after Cyto D pretreatment of the suspensions, NHE3 protein abundance was increased in LMV and remained unchanged in cortical cell homogenates. The effect of Cyto D on NHE3 was further assessed with cultures of murine cortical cells. The amount of surface biotinylated NHE3 increased on Cyto D treatment, whereas NHE3 protein abundance was unchanged in cell homogenates. In conclusion, under basal conditions NHE3 activity depends on the state of actin organization possibly involved in trafficking processes between luminal membrane and intracellular compartment.

kidney; sodium/hydrogen exchanger 3 antiporter; protein trafficking


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