Effects of biogenic amines and hormones on butterfly Malpighian tubules: Dopamine stimulates fluid secretion |
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Authors: | SW Nicolson RP Millar |
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Institution: | 1. Department of Zoology, University of Cape Town, Rondebosch 7700 South Africa;2. Department of Chemical Pathology, University of Cape Town Medical School, Observatory 7925, South Africa |
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Abstract: | Isolated Malpighian tubules of Papilio demodocus, the citrus swallowtail butterfly, were stimulated by biogenic amines as well as by cyclic AMP and the naturally occuring diuretic hormone. The greatest secretory response was obtained with 5-hydroxytryptamine, and smaller responses with dopamine and noradrenaline, but none of these amines could induce the maximal secretion rates obtained with cyclic AMP and diuretic hormone. Various other biogenic amines, hormones and pharmacological agents, including adrenaline, had no effect on Papilio tubules. The blocking agents cyproheptadine, phentolamine and propranolol did not alter the tubule response to biogenic amines. |
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Keywords: | Malpighian tubules diuretic hormone biogenic amines dopamine blocking agents |
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