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    Serotonin has kinin-like activity in stimulating secretion by Malpighian tubules of the house cricket Acheta domesticus

    Coast, Geoffrey M. (2011) Serotonin has kinin-like activity in stimulating secretion by Malpighian tubules of the house cricket Acheta domesticus. Peptides 32 (3), pp. 500-508. ISSN 0196-9781.

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    Serotonin stimulates secretion by Malpighian tubules (MT) of a number of insects, and functions as a diuretic hormone in Rhodnius prolixus and in larval Aedes aegypti. Serotonin is here shown to be a potent stimulant of secretion by MT of the house cricket, Acheta domesticus, with an apparent EC(50) of 9.4 nmol L(-1), although its diuretic activity is just 25% of the maximum achievable with either the native CRF-related peptide, Achdo-DH, or a crude extract of the corpora cardiaca. In this respect, the diuretic activity of serotonin is similar to that of the cricket kinin Achdo-KI, and when tested together their actions are not additive, which suggests they target the same transport process. Consistent with this suggestion, the activity of serotonin is chloride-dependent and is associated with a non-selective stimulation of NaCl and KCl transport. In common with Achdo-KI, serotonin has no effect on cAMP production by isolated MT, and both act synergistically with exogenous 8bromo-cAMP in stimulating fluid secretion, most likely by promoting the release of Ca(2+) from intracellular stores. A number of serotonin agonists and antagonists were tested to determine the pharmacological profile of receptors on cricket MT. The results are consistent with the diuretic activity of serotonin being mediated through a 5-HT(2)-like receptor.


    Item Type: Article
    Keyword(s) / Subject(s): Animals, calcium signaling, cyclic AMP, gryllidae, kinins malpighian tubules, serotonin
    School: School of Science > Biological Sciences
    Depositing User: Administrator
    Date Deposited: 24 May 2011 09:43
    Last Modified: 17 Apr 2013 12:20


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