L-Methionine enhances the contractile response to norepinephrine of rat vas deferens.

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Abstract
Under Ca-depleted conditions, the contractile responses of rat vas deferens in the presence of norepinephrine were not elicited until the addition of CaCl2. L-Methionine enhanced the contractile response of vas deferens in the presence of methylation blockers under these conditions. The enhancing effect of L-methionine on some other smooth muscles could not be determined because under Ca-depleted conditions, these muscles showed 60-80% of the maximal contractile response on addition of CaCl2 alone. These findings suggest that L-methionine has an enhancing effect on contraction of the rat vas deferens as it does on rat uterine muscle.