The Vacuolar-Type H+-ATPase in Ovine Rumen Epithelium is Regulated by Metabolic Signals

Abstract EN

In this study, the effect of metabolic inhibition (MI) by glucose substitution with 2-deoxyglucose (2-DOG) and/or application of antimycin A on ovine rumen epithelial cells (REC) vacuolar-type H+-ATPase (vH+-ATPase) activity was investigated.

Using fluorescent spectroscopy, basal pHi of REC was measured to be 7.3±0.1 in HCO3−-free, glucose-containing NaCl medium.

MI induced a strong pHi reduction (−0.44±0.04 pH units) with a more pronounced effect of 2-DOG compared to antimycin A (−0.30±0.03 versus −0.21±0.03 pH units).

Treatment with foliomycin, a specific vH+-ATPase inhibitor, decreased REC pHi by 0.21±0.05 pH units.

After MI induction, this effect was nearly abolished (−0.03±0.02 pH units).

In addition, membrane-associated localization of vH+-ATPase B subunit disappeared.

Metabolic control of vH+-ATPase involving regulation of its assembly state by elements of the glycolytic pathway could provide a means to adapt REC ATP consumption according to energy availability.