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Am J Physiol Cell Physiol (November 20, 2002). doi:10.1152/ajpcell.00359.2002
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Articles in PresS, published online ahead of print November 20, 2002
Am J Physiol Cell Physiol, 10.1152/ajpcell.00359.2002
Submitted on August 2, 2002
Accepted on November 18, 2002

Regulation of chloride permeability by endogenously produced tyramine in the Drosophila Malpighian tubule

Edward M Blumenthal1*

1 Department of Biology and NSF Center for Biological Timing, University of Virginia, Charlottesville, VA, USA

* To whom correspondence should be addressed. E-mail: eb5f{at}virginia.edu.

The Malpighian (renal) tubule of Drosophila melanogaster is a useful model for studying epithelial transport. The purpose of this study was to identify factors responsible for modulating transepithelial chloride conductance in isolated tubules. I have found that tyrosine and several of its metabolites cause an increase in chloride conductance. The most potent of these agonists is tyramine, which is active at low nanomolar concentrations; the pharmacology of this response matches that of the previously published cloned insect tyramine receptor. In addition, the tubule appears capable of synthesizing tyramine from applied tyrosine, as shown by direct measurement of tyrosine decarboxylase activity. Immunohistochemical staining of tubules with an antibody against tyramine indicates that the principal cells are the sites of tyramine production, while previous characterization of the regulation of chloride conductance suggests that tyramine acts upon the stellate cells. This is the first demonstration of a physiological role for an insect tyramine receptor.




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