Summary
Experiments were performed to characterize arginine transport in vascular smooth muscle cells (SMCs) and the effect of angiotensin II (Ang II) on this process. In addition, the role of arginine transport in the cytokineinduced nitric oxide (NO) production was assessed. Arginine transport takes place through Na+-independent (≈60%) and Na+-dependent pathways (≈40%). The Na+-independent arginine uptake appears to be mediated by system y+ because of its sensitivity to cationic amino acids such as lysine, ornithine and homoarginine. The transport system was relatively insensitive to acidification of the extracellular medium. By contrast, the Na+-dependent pathway is consistent with system B0,+ since it was inhibited by both cationic and neutral amino acids (i.e., glutamine, phenylalanine, and asparagine), and did not accept Li+ as a Na+ replacement. Treatment of SMCs with 100nM Ang II significantly inhibited the Na+-dependent arginine transport without affecting systems y+, A, and L. This effect occurred in a dose-dependent manner (IC50 of 8.9 ± 0.9nM) and is mediated by the AT-1 receptor subtype because it was blocked by DUP 753, a non-peptide antagonist of this receptor. The inhibition of system B0,+ by Ang II is mediated by protein kinase C (PKC) because it was mimicked by phorbol esters (phorbol 12-myristate 13-acetate) and was inhibited by staurosporine. Ang II also inhibited the IL-1β induced nitrite accumulation by SMCs. This action was also inhibited by staurosporine and reproduced with phorbol esters, suggesting a coupling between arginine uptake and NO synthesis through a PKC-dependent mechanism. However, arginine supplementation in the medium (10mM) failed to prevent the inhibitory action of Ang II on NO synthesis. These findings suggest that although Ang II inhibits concomitantly arginine transport and NO synthesis in SMCs, the reduction of NO synthesis is not associated with alterations in the cellular transport of arginine.
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Abbreviations
- Arg:
-
arginine
- Orn:
-
ornithine
- HmR:
-
homoarginine
- Lys:
-
lysine
- Gln:
-
glutamine
- Asn:
-
asparagine
- His:
-
histidine
- Phe:
-
phenylalanine
- Leu:
-
leucine
- Cys:
-
Cysteine
- Ala:
-
alanine
- Ser:
-
serine
- Thr:
-
threonine
- Glu:
-
glutamate
- mAIB:
-
α-methyl-aminoisobutyric acid
- BCH:
-
bicycloaminoheptane
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Rivera-Correa, M., Altieri, P.I. & Escobales, N. Parallel regulation of arginine transport and nitric oxide synthesis by angiotensin II in vascular smooth muscle cells role of protein kinase C. Amino Acids 11, 153–170 (1996). https://doi.org/10.1007/BF00813858
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DOI: https://doi.org/10.1007/BF00813858