Membrane Transporters and Cytoplasmatic pH Regulation on Bovine Sertoli Cells

Membrane Transporters and Cytoplasmatic pH Regulation on Bovine Sertoli Cells Sertoli cells are responsible for regulating a wide range of processes that lead to the differentiation of male germ cells into spermatozoa. Cytoplasmic pH (pH i ) has been shown to be an important parameter in cell physiology, regulating namely cell metabolism and differentiation. However, membrane transport mechanisms involved in pH i regulation mechanisms of Sertoli cells have not yet been elucidated. In this work, pH i was determined using the pH-sensitive fluorescent probe 2′,7′-bis-(2-carboxyethyl)-5-(and-6)-carboxyfluorescein (BCECF). Addition of weak acids resulted in rapid acidification of the intracellular milieu. Sertoli cells then recovered pH i by a mechanism that was shown to be sensitive to external Na+. pH i recovery was also greatly reduced in the presence of 4,4′-diisothiocyanatostilbene-2,2′-disulfonic acid (DIDS) and amiloride. These results point toward the action of an Na+-driven HCO 3 − /Cl− exchanger and/or an Na+/HCO 3 − cotransporter and the action of the Na+/H+ exchanger on pH i regulation in the experimental conditions used. pH i recovery was only slightly affected by ouabain, suggesting that the inhibition of Na+/K+-ATPase affects recovery indirectly, possibly via the shift on the Na+ gradient. On the other hand, recovery from the acid load was independent of the presence of concanamycin A, a specific inhibitor of the V-type ATPases, suggesting that these pumps do not have a relevant action on pH i regulation in bovine Sertoli cells. The Journal of Membrane Biology Springer Journals

Membrane Transporters and Cytoplasmatic pH Regulation on Bovine Sertoli Cells

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Copyright © 2008 by Springer Science+Business Media, LLC
Life Sciences; Human Physiology ; Biochemistry, general
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