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Vol. 26, Issue 6, 598-604, June 1998
Environmental Health and Occupational Medicine Center, Department
of Pharmacology, Toxicology and Therapeutics, University of Kansas
Medical Center
The present study examined the tissue distribution of rat
sulfotransferase (SULT) mRNAs to assess the relative contribution of
each tissue to the process of sulfation. The SULT isoforms examined
were male-dominant SULTs (SULT1A1, SULT1C1, and SULT1E2), female-dominant SULTs (SULT20/21, SULT40/41, and SULT60), and the
recently cloned, non sex-dependent SULT (SULT1B1). SULTs fall into two
distinct classes based on substrate preference: phenol SULTs (SULT1A1,
SULT1B1, SULT1C1, and SULT1E2) and hydroxysteroid SULTs (SULT20/21,
SULT40/41, and SULT60). The following tissues were analyzed for SULT
mRNA expression: liver, brain, lung, heart, intestine, kidney, adrenal,
prostate, testes, ovary, uterus, and spleen by Northern blot analysis
with [
-32P]dATP-labeled oligonucleotide
probes specific for individual SULT mRNAs. Tissue expression levels of
each SULT were quantified and compared with liver expression by
phosphor-autoradiographic analysis. Male-dominant SULT expression was
observed in many organs, where SULT1A1 was expressed in liver, brain,
lung, heart, intestine, kidney, adrenal, testes, and spleen; SULT1C1
expression was observed in liver, kidney, and spleen; and SULT1E2
expression was observed only in liver and heart. The female-dominant
SULTs exhibited a more limited tissue distribution. Expression of
SULT20/21 and SULT60 was observed only in liver and adrenal gland,
whereas SULT40/41 expression was observed only in liver. SULT1B1 was
expressed to a similar extent in tissues of male and female rats and
was detected in liver, intestine, and kidney. Expression of SULT mRNAs
in liver was much higher than in other tissues, except for SULT1A1,
which exhibited substantial expression in lung, and SULT1B1, which was expressed at relatively high levels in intestine. These studies indicate that liver is the most diverse organ with respect to expression of multiple SULT enzymes and is therefore the most significant organ involved in sulfation. In contrast to liver, extrahepatic tissues express specific SULT mRNAs, and this may be
important for the physiological role of each tissue.
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