Expression Profiling of Human Sulfotransferase and Sulfatase Gene Superfamilies in Epithelial Tissues and Cultured Cells

doi:10.1006/bbrc.2000.3643

Biochemical and Biophysical Research Communications

Volume 277, Issue 1, 14 October 2000, Pages 236-245

https://doi.org/10.1006/bbrc.2000.3643 Get rights and content

Abstract

The bioavailability of drugs administered topically or orally depends on their metabolism by epithelial enzymes such as the cytosolic sulfotransferases (SULT). Reverse transcriptase-polymerase chain reaction (RT-PCR) methods were established to detect expression of 8 SULT genes and 4 arylsulfatase (ARS) genes in human tissues of epithelial origin and in cultures of normal and transformed (cancer) cells. The results indicate: (i) SULT 1A1, 1A3, ARSC, and ARSD genes are ubiquitously expressed; (ii) expression is frequently similar between cell lines and corresponding tissues; (iii) SULT gene expression in normal cultured cells is generally comparable to the expression in associated transformed (cancer) cell lines; (iv) SULT 1A1 promoter usage is mainly tissue specific; however, both promoters are frequently used in SULT 1A3 expression; and (v) the expression profile of SULT 1A1, 1A3, 1E1, and 2B1a/b suggests that one or more of these isoforms may be involved in the cutaneous sulfoconjugation of minoxidil and cholesterol.

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Sulfation of 12-hydroxy-nevirapine by human SULTs and the effects of genetic polymorphisms of SULT1A1 and SULT2A1
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Nevirapine (NVP) is an effective drug for the treatment of HIV infections, but its use is limited by a high incidence of severe skin rash and liver injury. 12-Hydroxynevirapine (12-OH-NVP) is the major metabolite of nevirapine. There is strong evidence that the sulfate of 12-OH-NVP is responsible for the skin rash. While several cytosolic sulfotransferases (SULTs) have been shown to be capable of sulfating 12-OH-NVP, the exact mechanism of sulfation in vivo is unclear. The current study aimed to clarify human SULT(s) and human organs that are capable of sulfating 12-OH-NVP and investigate the metabolic sulfation of 12-OH-NVP using cultured HepG2 human hepatoma cells. Enzymatic assays revealed that of the thirteen human SULTs, SULT1A1 and SULT2A1 displayed strong 12-OH-NVP-sulfating activity. 1-Phenyl-1-hexanol (PHHX), which applied topically prevents the skin rash in rats, inhibited 12-OH-NVP sulfation by SULT1A1 and SULT2A1, implying the involvement of these two enzymes in the sulfation of 12-OH-NVP in vivo. Among five human organ cytosols analyzed, liver cytosol displayed the strongest 12-OH-NVP-sulfating activity, while a low but significant activity was detected with skin cytosol. Cultured HepG2 cells were shown to be capable of sulfating 12-OH-NVP. The effects of genetic polymorphisms of SULT1A1 and SULT2A1 genes on the sulfation of 12-OH-NVP by SULT1A1 and SULT2A1 allozymes were investigated. Two SULT1A1 allozymes, Arg37Asp and Met223Val, showed no detectable 12-OH-NVP-sulfating activity, while a SULT2A1 allozyme, Met57Thr, displayed significantly higher 12-OH-NVP-sulfating activity compared with the wild-type enzyme. Collectively, these results contribute to a better understanding of the involvement of sulfation in NVP-induced skin rash and provide clues to the possible role of SULT genetic polymorphisms in the risk of this adverse reaction.
Human hepatic microsomal sulfatase catalyzes the hydrolysis of polychlorinated biphenyl sulfates: A potential mechanism for retention of hydroxylated PCBs
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Polychlorinated biphenyls (PCBs) are persistent environmental contaminants that continue to be of concern due to their varied toxicities. Upon human exposure, many PCBs with lower numbers of chlorine atoms are metabolized to hydroxylated derivatives (OH-PCBs), and cytosolic sulfotransferases can subsequently catalyze the formation of PCB sulfates. Recent studies have indicated that PCB sulfates bind reversibly with a high affinity to human serum proteins, and that they are also taken up by cells and tissues. Since PCB sulfates might be hydrolyzed to the more toxic OH-PCBs, we have investigated the ability of human hepatic microsomal sulfatase to catalyze this reaction. Twelve congeners of PCB sulfates were substrates for the microsomal sulfatase with catalytic rates exceeding that of dehydroepiandrosterone sulfate as a comparison substrate for steroid sulfatase (STS). These results are consistent with an intracellular mechanism for sulfation and de-sulfation that may contribute to retention and increased time of exposure to OH-PCBs.
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Citation Excerpt :
Finally, two isozymes of 3β-hydroxysteroid dehydrogenase may inactivate androgens to compounds that do not recognize the androgen receptor. The kidneys mainly eliminate the metabolites either by glucuronidation or by sulfation [15,16]. A number of important transferases have also been observed in skin biopsy samples or cultured skin cells.
Formestane (4-hydroxyandrost-4-ene-3,17-dione, 4OH-AED) is an aromatase inhibitor prohibited in sports. In recent years, it has been demonstrated that it can also originate endogenously by the hydroxylation in C4 position of androstenedione. Thus, the use of isotope ratio mass spectrometry (IRMS) is mandatory according to the World Antidoping Agency (WADA) to discriminate endogenous from synthetic origin.
In a previous work and after oral administrations of formestane (4OH-AED), the ratio between the main formestane metabolite (4α-hydroxyepiandrosterone; 4OH-EA) and formestane parent compound could help to identify the endogenous origin, avoiding unnecessary and costly IRMS confirmations. In the present work, we investigated whether the same criteria could also be applied after transdermal applications. Six volunteers were transdermally treated once with formestane. Urine samples were collected for 120 h postadministration and analyzed by gas chromatography coupled to mass spectrometry (GC–MS and GC–MS/MS). Formestane and its major metabolites were monitored.
The kinetic profile of formestane and its main metabolites was found different between oral and transdermal application. A shift on the excretion of the metabolites compared to formestane itself that can be observed after the oral administration, is absent after the transdermal one. This makes that a simple criteria cannot be applied to differentiate the endogenous from the synthetic origin based on metabolic ratios.
The ratio between 4-hydroxyepiandrosterone and 4-hydroxyandrosterone (4OH-A) can be used to differentiate the route of administration. Ratios higher than one (4OH-EA/4OH-A > 1) are diagnostic of an oral administration. This allows to correctly interpret the 4OH-EA/4OH-AED ratio as proposed in our previous investigation. The results of this work demonstrate that the use of appropriate biomarkers (metabolic ratios) helps to reach correct conclusions without using complex and costly instrumentation approaches.
On the sulfation of O-desmethyltramadol by human cytosolic sulfotransferases
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Therefore, both of these two cell lines are equipped with enzymes that are capable of sulfating O-DMT. Since the SULTs are differentially expressed in different organs of the human body [41,43], it is interesting to compare the O-DMT-sulfating activity of different human organ specimens. The highest activities detected for the small intestine sample (Table 3) was compatible with the high levels of expression of SULT1A3 in gastrointestinal track, particularly the small intestine [41].
Previous studies have demonstrated that sulfate conjugation is involved in the metabolism of the active metabolite of tramadol, O-desmethyltramadol (O-DMT). The current study aimed to systematically identify the human cytosolic sulfotransferases (SULTs) that are capable of mediating the sulfation of O-DMT.
The sulfation of O-DMT under metabolic conditions was demonstrated using HepG2 hepatoma cells and Caco-2 human colon carcinoma cells. O-DMT-sulfating activity of thirteen known human SULTs and four human organ specimens was examined using an established sulfotransferase assay. pH-Dependency and kinetic parameters were also analyzed using, respectively, buffers at different pHs and varying O-DMT concentrations in the assays.
Of the thirteen human SULTs tested, only SULT1A3 and SULT1C4 were found to display O-DMT-sulfating activity, with different pH-dependency profiles. Kinetic analysis revealed that SULT1C4 was 60 times more catalytically efficient in mediating the sulfation of O-DMT than SULT1A3 at respective optimal pH. Of the four human organ specimens tested, the cytosol prepared from the small intestine showed much higher O-DMT-sulfating activity than cytosols prepared from liver, lung, and kidney. Both cultured HepG2 and Caco-2 cells were shown to be capable of sulfating O-DMT and releasing sulfated O-DMT into cultured media.
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Regular ArticleExpression Profiling of Human Sulfotransferase and Sulfatase Gene Superfamilies in Epithelial Tissues and Cultured Cells

Abstract

Chemico-Biol. Interact.

Chemico-Biol. Interact.

Genomics

Biochim. Biophys. Acta

Biochem. Pharmacol.

Arch. Biochem. Biophys.

Trends Pharmacol. Sci.

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J. Invest. Dermatol.

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Genomics

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Int. J. Biochem. Cell Biol.

Mol. Cell. Endocrinol.

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Regular Article
Expression Profiling of Human Sulfotransferase and Sulfatase Gene Superfamilies in Epithelial Tissues and Cultured Cells