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Regulation of Metabolism in Working Muscle in Vivo

II. CONCENTRATIONS OF ADENINE NUCLEOTIDES, ARGININE PHOSPHATE, AND INORGANIC PHOSPHATE IN INSECT FLIGHT MUSCLE DURING FLIGHT

From the ¹ From the Physiology Division, Directorate of Medical Research, United States Army Edgewood Arsenal Chemical Research and Development Laboratories, Edgewood Arsenal, Maryland 21010, and the Department of Pathobiology, School of Hygiene and Public Health, The Johns Hopkins University, Baltimore, Maryland 21205

The concentrations of adenosine mono-, di-, and triphosphates, arginine phosphate, and inorganic phosphate in flight muscle of the blowfly, Phormia regina, were measured concurrently after periods of flight ranging from 5 sec to 1 hour. At the onset of contraction, the concentrations of ATP and arginine-P decreased, whereas those of ADP, P_i, and especially AMP, increased. The pattern of changes in these phosphates is in accord with the postulated mechanism of glycolytic regulation at the phosphofructokinase step. Possible oscillatory responses induced by the initiation of active contraction in vivo are suggested.

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