Estradiol inhibits the activity of proton-coupled amino acid transporter PAT1 expressed in Xenopus oocytes

2012 ◽  
Vol 695 (1-3) ◽  
pp. 34-39
Author(s):  
Linlin Shan ◽  
Yujie Yang ◽  
Jin Wang ◽  
Ji Zuo ◽  
Xianhong Dong ◽  
...  
Keyword(s):  
Amino Acid ◽  
Xenopus Oocytes ◽  
Amino Acid Transporter ◽  
Acid Transporter

scholarly journals Multiple components of arginine and phenylalanine transport induced in neutral and basic amino acid transporter-cRNA-injected Xenopus oocytes

1996 ◽  
Vol 318 (3) ◽  
pp. 915-922 ◽  
Author(s):  
George J PETER ◽  
Iain G. DAVIDSON ◽  
Aamir AHMED ◽  
Lynn McILROY ◽  
Alexander R. FORRESTER ◽  
...  
Keyword(s):  
Amino Acid ◽  
Xenopus Oocytes ◽  
Competitive Inhibition ◽  
Protein Complexes ◽  
Basic Amino Acid ◽  
Amino Acid Transporter ◽  
Transport Processes ◽  
Arginine Transport ◽  
Acid Transporter ◽  
Phenylalanine Transport

The induced uptakes of l-[3H]phenylalanine and l-[3H]arginine in oocytes injected with clonal NBAT (neutral and basic amino acid transporter) cRNA show differential inactivation by pre-treatment with N-ethylmaleimide (NEM), revealing at least two distinct transport processes. NEM-resistant arginine transport is inhibited by leucine and phenylalanine but not by alanine or valine; mutual competitive inhibition of NEM-resistant uptake of arginine and phenylalanine indicates that the two amino acids share a single transporter. NEM-senstive arginine transport is inhibited by leucine, phenylalanine, alanine and valine. At least two NEM-sensitive transporters may be expressed because we have been unable to confirm mutual competitive inhibition between arginine and phenylalanine transport. The NEM-resistant transport mechanism appears to involve distinct but overlapping binding sites for cationic and zwitterionic substrates. NBAT is known to form oligomeric protein complexes in cell membranes, and its functional roles when expressed in Xenopus oocytes may include interaction with oocyte proteins, leading to increased native amino acid transport activities; these resemble NBAT-expressed activities in terms of NEM-sensitivity and apparent substrate range (including an unusual inhibition by β-phenylalanine).

scholarly journals Cloning, functional expression and dietary regulation of the mouse neutral and basic amino acid transporter (NBAT)

1997 ◽  
Vol 328 (2) ◽  
pp. 657-664 ◽  
Author(s):  
Hiroko SEGAWA ◽  
Ken-ichi MIYAMOTO ◽  
Yoshio OGURA ◽  
Hiromi HAGA ◽  
Kyoko MORITA ◽  
...  
Keyword(s):  
Amino Acid ◽  
Xenopus Oocytes ◽  
Physiological Role ◽  
Basic Amino Acid ◽  
Functional Expression ◽  
Amino Acid Transporter ◽  
Amino Acid Transporters ◽  
Transport Activity ◽  
Acid Transporter ◽  
Mouse Ileum

The Na+-independent dibasic and neutral amino acid transporter NBAT is among the least hydrophobic of mammalian amino acid transporters. The transporter contains one to four transmembrane domains and induces amino acid transport activity via a b0,+-like system when expressed in Xenopus oocytes. However, the physiological role of NBAT remains unclear. Complementary DNA clones encoding mouse NBAT have now been isolated. The expression of mouse NBAT in Xenopus oocytes also induced an obligatory amino acid exchange activity similar to that of the b0,+-like system. The amount of NBAT mRNA in mouse kidney increased during postnatal development, consistent with the increase in renal cystine and dibasic transport activity. Dietary aspartate induced a marked increase in cystine transport via the b0,+ system in mouse ileum. A high-aspartate diet also increased the amount of NBAT mRNA in mouse ileum. In the ileum of mice fed on the aspartate diet, the extent of cystine transport was further increased by preloading brush border membrane vesicles with lysine. Hybrid depletion of NBAT mRNA from ileal polyadenylated RNA revealed that the increase in cystine transport activity induced by the high-aspartate diet, as measured in Xenopus oocytes, was attributable to NBAT. These results demonstrate that mouse NBAT has an important role in cystine transport.

scholarly journals Expression of the mammalian system A neutral amino acid transporter in Xenopus oocytes.

1990 ◽  
Vol 265 (23) ◽  
pp. 13914-13917
Author(s):  
R.W. Tarnuzzer ◽  
M.J. Campa ◽  
N.X. Qian ◽  
E. Englesberg ◽  
M.S. Kilberg
Keyword(s):  
Amino Acid ◽  
Xenopus Oocytes ◽  
Amino Acid Transporter ◽  
Neutral Amino Acid ◽  
System A ◽  
Neutral Amino Acid Transporter ◽  
Acid Transporter ◽  
Mammalian System

scholarly journals Transport of Methylmercury through the Epithelial Type Amino Acid Transporter System B0

2019 ◽  
Vol 5 (2) ◽  
pp. 127-136
Author(s):  
Rafiqul Islam ◽  
Naohiko Anzai ◽  
Nesar Ahmed ◽  
Mohammad Ahtashamul Haque ◽  
Shamima Ferdous ◽  
...  
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Molecular Mechanism ◽  
Xenopus Oocytes ◽  
Critical Role ◽  
Amino Acid Transporter ◽  
Intestinal Lumen ◽  
Dependent Manner ◽  
Sodium Dependent ◽  
Acid Transporter

Background: System B0 is a sodium dependent transporter that transports wide variety of neutral amino acids in the intestinal and renal proximal tubular epithelial cells. Methylmercury (MeHg) readily and non-enzymatically reacts with cysteine to form conjugate structurally similar to the amino acid methionine. Objective: In this study, we investigated the molecular mechanism of absorptive transport of MeHg in intestine using Xenopus oocytes expressing hB0AT1 and the uptake of metylmercry-Cys (MeHg-Cys) by heterodimeric amino acids transporter. Methodology: We confirmed the uptake of [14C] L-Leucine a potent substrate for the hB0AT1 amino acids transporter. The uptake of [14C] L-leucine by hB0AT1 was inhibited by MeHg-Cys conjugate, leucine, cysteine, methinine and phenylalanine in concentration–dependent manner. The IC50 of MeHg-Cys conjugate was significantly lower than that of leucine, cysteine, methinine and phenylalanine, indicating that hB0AT1 is a high affinity MeHg transporter. To assess MeHg-Cys conjugate transport, we measured [14C] MeHg uptake in Xenopus oocytes expressing hB0AT1 in presence or absence of sodium. The [14C] MeHg was transport only in the presence of cysteine and the transport was significantly sodium dependent and inhibited by a system B0 inhibitor 2-aminobicyclo-[2,21]- haptane-2-carboxylic acid (BCH). Result: The current findings indicate that hB0AT1 and heterodimeric amino acids absorb MeHg in the form of cysteine conjugate from the intestinal lumen across the brush-border membrane in to the cells and is supposed to be plays a critical role in the pathogenesis of Minamata disease and present results descried a major molecular mechanism by which MeHg is transported across cell membranes and indicate that metal complexes may form a novel class of substrates for amino acid carriers. Conclusion: In this experiment the results also suggest that uptake of Methionine and MeHg-Cys by heterodimeric amino acid transporter is significantly correlated where the uptake of Methionine and MeHg-Cys between heterodimeric amino acid transporter and hB0AT1 is not correlated. Journal of National Institute of Neurosciences Bangladesh, 2019;5(2): 127-136

Ondansetron attenuates the activity of excitatory amino acid transporter type 3 expressed in Xenopus oocytes

2014 ◽  
Vol 733 ◽  
pp. 7-12 ◽  
Author(s):  
Wonseok Hur ◽  
Mi Kyoung Lee ◽  
Hee-Pyeong Park ◽  
Chong-Sung Kim ◽  
Hea-Jo Yoon ◽  
...  
Keyword(s):  
Amino Acid ◽  
Xenopus Oocytes ◽  
Excitatory Amino Acid ◽  
Amino Acid Transporter ◽  
Excitatory Amino Acid Transporter ◽  
Acid Transporter ◽  
Type 3

Increased expression of an amino acid transporter LAT1 in healing of acetic acid-induced chronic gastric ulcer in rats

2001 ◽  
Vol 120 (5) ◽  
pp. A153-A153
Author(s):  
S MIYAMOTO ◽  
K KATO ◽  
Y ISHII ◽  
S ASAI ◽  
T NAGAISHI ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Gastric Ulcer ◽  
Amino Acid ◽  
Amino Acid Transporter ◽  
Chronic Gastric Ulcer ◽  
Acid Transporter
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