Abstract
Mastoparan, a wasp venom, was found to inhibit Na +− dependent net alpha-aminoisobutyric acid (AIB) uptake in Madin Darby Canine Kidney (MDCK) cells. Mastoparan also produced a significant increase in AIB efflux when compared to controls. Pretreatment of MDCK cells with 2 mM neomycin attenuated mastoparan's inhibition of net AIB uptake and completely suppressed mastoparan-mediated increases in AIB efflux when compared to controls. These data suggest that mastoparan's inhibition of net AIB uptake involves more than a single basic mechanism.
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