The neurohormone ovary ecdysteroidogenic hormone I (OEH I), originally identified from Aedes aegypti, has an effect on mosquito ecdysteroidogenesis. Would there be a similar presence and function in other flies (i.e., Phormia regina)? One pair of median neurosecretory cells (MNCs) and one pair of type-A lateral neurosecretory cells ( LNC-As) were indeed immunopositive to OEH I antiserum in the brain of sugar-fed and liver-fed female Phormia regina. In addition, two pairs of neurosecretory cells positive to this antiserum were found in the suboesophageal ganglion only in female Phormia regina at 16, 20, 23, 28, 36, 72 hours after a liver meal. In addition to the positive pairs of MNCs and LNC-As in females, there were three more pairs of positive neurons in the region between MNCs and the oesophagus foramen only in male Phormia regina. The presence of OEHI in male flies urges further attention of the function of this hormone in the Diptera. In a separate study, we also found substances positive to Drosophila melanogaster insulin receptor antiserum located between the corpus cardiacum and corpus allatum of female Phormia regina at 6 and 30 hours after the liver meal.
Species 1: Diptera Calliphoridae Phormia regina (queen blow fly)
Keywords: OEH I, insulin receptor
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