TY - JOUR
T1 - Identification and characterization of novel rat and human gonad-specific organic anion transporters
AU - Suzuki, Takehiro
AU - Onogawa, Tohru
AU - Asano, Naoki
AU - Mizutamari, Hiroya
AU - Mikkaichi, Tsuyoshi
AU - Tanemoto, Masayuki
AU - Abe, Michiaki
AU - Satoh, Fumitoshi
AU - Unno, Michiaki
AU - Nunoki, Kazuo
AU - Suzuki, Masanori
AU - Hishinuma, Takanori
AU - Goto, Junichi
AU - Shimosegawa, Toru
AU - Matsuno, Seiki
AU - Ito, Sadayoshi
AU - Abe, Takaaki
PY - 2003/7/1
Y1 - 2003/7/1
N2 - We have isolated three novel organic anion transporter cDNAs designated rat GST-1 (gonad-specific transporter), rat GST-2, and human GST, expressed at high levels in the testis. Rat GST-1, GST-2, and human GST consist of 748, 702, and 719 amino acids, respectively, and all molecules possess the 12 predicted transmembrane domains, which is a common structure of organic anion transporters. Northern blot analyses and in situ hybridization revealed that both of the rat molecules are highly expressed in the testis, especially in Sertoli cells, spermatogonia, and Leydig cells. Weak signals are also detected in the epididymis and ovary in adult rat. The exclusive expression of human GST mRNA in the testis was confirmed by RT-PCR. The pharmacological experiments of Xenopus laevis oocytes injected with the respective rat GST-1- and GST-2-cRNAs revealed that both rat GST-1 and GST-2 transport taurocholic acid, dehydroepiandrosterone sulfate, and T4 with Michaelis-Menten kinetics (taurocholic acid, Km = 8.9 and 2.5 μM, dehydroepiandrosterone sulfate, Km = 25.5 and 21.μM, and T4, Km = 6.4 and 5.8 for rat GST-1 and GST-2, respectively). T3 was also transported by rat GST-1 and GST-2. These data suggest that rat GST-1 and GST-2 might be one of the molecular entities responsible for transporting dehydroepiandrosterone sulfate and thyroid hormones involved in the regulation of sex steroid transportation and spermatogenesis in the gonad.
AB - We have isolated three novel organic anion transporter cDNAs designated rat GST-1 (gonad-specific transporter), rat GST-2, and human GST, expressed at high levels in the testis. Rat GST-1, GST-2, and human GST consist of 748, 702, and 719 amino acids, respectively, and all molecules possess the 12 predicted transmembrane domains, which is a common structure of organic anion transporters. Northern blot analyses and in situ hybridization revealed that both of the rat molecules are highly expressed in the testis, especially in Sertoli cells, spermatogonia, and Leydig cells. Weak signals are also detected in the epididymis and ovary in adult rat. The exclusive expression of human GST mRNA in the testis was confirmed by RT-PCR. The pharmacological experiments of Xenopus laevis oocytes injected with the respective rat GST-1- and GST-2-cRNAs revealed that both rat GST-1 and GST-2 transport taurocholic acid, dehydroepiandrosterone sulfate, and T4 with Michaelis-Menten kinetics (taurocholic acid, Km = 8.9 and 2.5 μM, dehydroepiandrosterone sulfate, Km = 25.5 and 21.μM, and T4, Km = 6.4 and 5.8 for rat GST-1 and GST-2, respectively). T3 was also transported by rat GST-1 and GST-2. These data suggest that rat GST-1 and GST-2 might be one of the molecular entities responsible for transporting dehydroepiandrosterone sulfate and thyroid hormones involved in the regulation of sex steroid transportation and spermatogenesis in the gonad.
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U2 - 10.1210/me.2002-0304
DO - 10.1210/me.2002-0304
M3 - Article
C2 - 12677006
AN - SCOPUS:12444339784
SN - 0888-8809
VL - 17
SP - 1203
EP - 1215
JO - Molecular Endocrinology
JF - Molecular Endocrinology
IS - 7
ER -