Regulation of filtration rate by glomerular mesangial cells in health and diabetic renal disease

American Journal of Kidney Diseases : the Official Journal of the National Kidney Foundation
J D Stockand, S C Sansom

Abstract

The rate of renal filtration is in large part responsible for volume and electrolyte balance in an organism. Integral components of the renal glomerulus are the mesangial cells (MCs), excitable renal pericytes that regulate the glomerular filtration rate by modulating the surface area of the capillaries. Similar to vascular smooth muscle, the signal transduction pathways and ion selective channels regulating isotonic and isometric contraction of MCs are dependent on the voltage-gated Ca influx. During the response to contractile agonists, both Cl and nonselective cation channels play critical roles to depolarize the membrane potential and activate Ca channels. The relaxation pathways involve a negative-feedback mechanism that counteracts mesangial contraction by regulating voltage-dependent Ca signaling. Part of the feedback response involves the activation of plasmalemmal K channels, which hyperpolarize the membrane potential and inhibit voltage-gated Ca entry. This calcium- and voltage-activated feedback K (BKCa) channel shares biophysical, pharmacologic, and molecular properties with the BKCa channels identified in brain and muscle, and with the sio gene product as expressed in Xenopus laevis oocytes. Systemic hormones, such...Continue Reading

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