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Journal of Experimental Biology, Vol 202, Issue 11 1551-1559, Copyright © 1999 by Company of Biologists

JOURNAL ARTICLES

Salivary glands of the sand fly Phlebotomus papatasi contain pharmacologically active amounts of adenosine and 5'-AMP

JM Ribeiro, O Katz, LK Pannell, J Waitumbi and A Warburg
Laboratory of Parasitic Diseases, NIAID, National Institutes of Health, Building 4, Room 126, Bethesda, MD 20892-0425, USA. Jribeiro@Atlas.Niaid.NIH.Gov

Salivary gland homogenates of the sand fly Phlebotomus papatasi contain large amounts of adenosine and 5'-AMP, of the order of 1 nmol per pair of glands, as demonstrated by liquid chromatography, ultraviolet spectrometry, mass spectrometry and bioassays. These purines, 75-80 % of which are secreted from the glands following a blood meal, have vasodilatory and anti-platelet activities and probably help the fly to obtain a blood meal. Salivary 5'-AMP is also responsible for the previously reported protein phosphatase inhibitor in the salivary glands of P. papatasi, which is shown to be artifactual in nature as a result of allosteric modification by AMP of the phosphatase substrate used (phosphorylase a).
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