alexa Proline can be utilized as an energy substrate during flight of Aedes aegypti females.
Biochemistry

Biochemistry

Biochemistry & Physiology: Open Access

Author(s): Scaraffia PY, Wells MA

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Abstract In order to determine whether proline can be utilized as fuel during flight of Aedes aegypti, proline, alanine, and glutamine concentrations were monitored at 0, 30 and 60 min after flight using sugar-fed males and females, and blood meal-fed females. In sugar-fed and blood meal-fed females, flight lead to a significant decrease in proline and a significant increase in glutamine concentration in both hemolymph and thorax. Only during flight after a blood meal was a significant increase in the alanine concentration observed in hemolymph. After flight, the proline alanine and glutamine levels in the hemolymph and thorax from males did not change significantly. In addition, activities of enzymes related to amino acid metabolism were assayed in homogenates of cephalothorax and thorax from both sexes, and in fat body and midgut from females. In both sexes, the activities of all the enzymes studied were significantly higher in thorax than in cephalothorax. The levels of the enzymes involved in proline oxidation were higher in thorax than in fat body and midgut. These results suggest that proline can be used as an energy substrate for flight muscle of Ae. aegypti females. However, the elevation in glutamine levels observed in hemolymph and thorax after flight has not been reported in other insects that fuel flight using proline and may suggest an additional mechanism for shuttling ammonia between flight muscle and fat body is present in mosquitoes.
This article was published in J Insect Physiol and referenced in Biochemistry & Physiology: Open Access

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