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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Differential effects on active avoidance performance and locomotor activity of two major enkephalin metabolites, tyr-gly-gly and des-tyr-[leu]enkephalin.

We examined the effects of two enkephalin metabolites, des-tyr-[leu]enkephalin and tyr-gly-gly, on one-way active avoidance conditioning in mice. These metabolites are products of the two major enkephalin hydrolyzing enzymes in plasma, aminopeptidase and angiotensin converting enzyme. Like [leu]enkephalin from which it may be formed, tyr-gly-gly impaired avoidance acquisition, and its dose-response function for this effect was U-shaped. Also like [leu]enkephalin, tyr-gly-gly did not alter locomotor activity. On the other hand, des-tyr-[leu]enkephalin, at the doses tested, was without effect on avoidance conditioning but produced decreased locomotion. These data suggest that the tyrosine end of the enkephalin molecule may be important for its effects on conditioning. Because of their low opioid potencies, it is unlikely that the behavioral actions of tyr-gly-gly and des-tyr-[leu]enkephalin are mediated through opioid receptors.[1]

References

  1. Differential effects on active avoidance performance and locomotor activity of two major enkephalin metabolites, tyr-gly-gly and des-tyr-[leu]enkephalin. Weinberger, S.B., Martinez, J.L. Life Sci. (1988) [Pubmed]
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