Abstract

This study focused on the investigation of the possible effect of gender and season on the activity of the thermolabile and thermostable forms of platelet phenolsulfotransferase (PST) in a group of 23 healthy, drug-free volunteers of both sexes. The results showed a different seasonal profile of PST activity in men and women: in men, PST seasonal rhythms revealed a shallow profile with higher values in both the spring and summer than in the autumn. Conversely, in women, the PST seasonality showed a profile consisting overall of a main peak in the summer. Also, significant gender-dependent correlations were found between the photoperiod length and PST values. Our findings should stimulate further investigation into gender-dependent molecular mechanisms underlying the regulation of the metabolism of endogenous and xenobiotic agents, such as monoamines and phenols, which are the substrates of PST.

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