Comparative excretion and tissue distribution of selenium in mice and rats following treatment with the chemopreventive agent 1,4-phenylenebis(methylene)selenocyanate.

Abstract:

:In a previous preliminary investigation, we reported on the excretion, tissue disposition and metabolism of the chemopreventive agent 1,4-phenylenebis(methylene)selenocyanate (p-XSC) in the rat, but similar studies in the mouse have not been explored. Following the oral administration of p-XSC (50 micromol/kg body weight), selenium excretion in feces was comparable to that in urine in mice, but in rats, feces was the major route of excretion. Tetraselenocyclophane (TSC) was the major metabolite detected in mouse and rat feces. In both species, levels of selenium in exhaled air were negligible. At termination, in the mouse, the stomach had the highest selenium content followed by liver and blood, but lung and kidney contained negligible levels of selenium; in the rat, the selenium level in liver was the highest followed by kidney, stomach, blood and lung. The identification of TSC as a fecal metabolite in both species let us to postulate the following metabolic pathway: p-XSC-->glutathione conjugate (p-XSeSG)-->a selenol (p-XSeH)-->TSC. Since the glutathione conjugate appears to be the proximal precursor for the selenol metabolite that may be an important intermediate in cancer chemoprevention, we report for the first time the synthesis of p-XSeSG and its other potential metabolites, namely the cysteine- and N-acetylcysteine-conjugates of p-XSC. HPLC analysis of the urine and bile showed a few metabolites of p-XSC; none of which eluted with the synthetic standards described above. When we examined the conversion of p-XSC and p-XSeSG in vitro using rat cecal microflora, TSC was formed from p-XSeSG but not from p-XSC. The formation of TSC from p-XSC in vivo but not in vitro suggests that p-XSC needs to be metabolized to p-XSeSG or an intermediate derived from its further metabolism. Thus, p-XSeSG was given orally to rats and the results showed that the pattern of selenium excretion after p-XSeSG treatment was similar to that of p-XSC; TSC was also identified as a fecal metabolite of p-XSeSG. It may be that the conversion of p-XSeSG to TSC is too facile, or the mere conjugation of p-XSC with glutathione does not occur in rats and mice.

journal_name

Chem Biol Interact

authors

Sohn OS,Desai DH,Das A,Rodriguez JG,Amin SG,El-Bayoumy K

doi

10.1016/j.cbi.2004.10.007

subject

Has Abstract

pub_date

2005-02-10 00:00:00

pages

193-202

issue

3

eissn

0009-2797

issn

1872-7786

pii

S0009-2797(04)00181-4

journal_volume

151

pub_type

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