Abstract
Everted rectal sacs of Schistocerca gregaria absorb 14C-acetate from the lumen side at high rates against large electrical and often small concentration differences. Most of the 14C-activity in the absorbed fluid remains as acetate, but small amounts serve as substrate for aerobic respiration within this tissue. When acetate is substituted for SO 4 −2 or Cl − in external salines, both short-circuit current ( I sc) and the open-circuit transepithelial potential ( PD) increase by as much as 2- to 3-fold. The stimulatory effect of acetate on I sc and PD exhibits saturation kinetics. The ‘steady-state’ influx of 14C-acetate from lumen (L) to haemocoel (H) side greatly exceeds efflux (haemocoel to lumen) across short-circuited recta. Over the whole range of acetate concentrations tested, the resulting net flux of acetate is sufficient to explain all of the increase in I sc caused by this organic anion. Acetate was detected in moderate concentrations in body fluids of locusts. The possible significance of acetate transport in vivo is discussed.
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