| pubmed-article:20219951 | rdf:type | pubmed:Citation | lld:pubmed |
| pubmed-article:20219951 | lifeskim:mentions | umls-concept:C0007634 | lld:lifeskim |
| pubmed-article:20219951 | lifeskim:mentions | umls-concept:C0035820 | lld:lifeskim |
| pubmed-article:20219951 | lifeskim:mentions | umls-concept:C0002520 | lld:lifeskim |
| pubmed-article:20219951 | lifeskim:mentions | umls-concept:C1420122 | lld:lifeskim |
| pubmed-article:20219951 | lifeskim:mentions | umls-concept:C1948027 | lld:lifeskim |
| pubmed-article:20219951 | lifeskim:mentions | umls-concept:C0597484 | lld:lifeskim |
| pubmed-article:20219951 | pubmed:issue | 6 | lld:pubmed |
| pubmed-article:20219951 | pubmed:dateCreated | 2010-5-21 | lld:pubmed |
| pubmed-article:20219951 | pubmed:abstractText | The results presented here show that STC-1 cells, a model of intestinal endocrine cells, respond to a broad range of amino acids, including l-proline, l-serine, l-alanine, l-methionine, l-glycine, l-histidine, and alpha-methyl-amino-isobutyric acid (MeAIB) with a rapid increase in the intracellular Ca(2+) concentration ([Ca(2+)](i)). We sought to identify the mechanism by which amino acids induce Ca(2+) signaling in these cells. Several lines of evidence suggest that amino acid transport through the Na(+)-coupled neutral amino acid transporter 2 (SNAT2) is a major mechanism by which amino acids induced Ca(2+) signaling in STC-1 cells: 1) the amino acid efficacy profile for inducing Ca(2+) signaling in STC-1 cells closely matches the amino acid specificity of SNAT2; 2) amino acid-induced Ca(2+) signaling in STC-1 cells was suppressed by removing Na(+) from the medium; 3) the nonmetabolized synthetic substrate of amino acid transport MeAIB produced a marked increase in [Ca(2+)](i); 4) transfection of small interfering RNA targeting SNAT2 produced a marked decrease in Ca(2+) signaling in response to l-proline in STC-1 cells; 5) amino acid-induced increase in [Ca(2+)](i) was associated with membrane depolarization and mediated by Ca(2+) influx, since it depended on extracellular Ca(2+); 6) the increase in [Ca(2+)](i) in response to l-proline, l-alanine, or MeAIB was abrogated by either nifedipine (1-10 muM) or nitrendipine (1 muM), which block L-type voltage-sensitive Ca(2+) channels. We hypothesize that the inward current of Na(+) associated with the function of SNAT2 leads to membrane depolarization and activation of voltage-sensitive Ca(2+) channels that mediate Ca(2+) influx, thereby leading to an increase in the [Ca(2+)](i) in enteroendocrine STC-1 cells. | lld:pubmed |
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| pubmed-article:20219951 | pubmed:language | eng | lld:pubmed |
| pubmed-article:20219951 | pubmed:journal | http://linkedlifedata.com/r... | lld:pubmed |
| pubmed-article:20219951 | pubmed:citationSubset | IM | lld:pubmed |
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| pubmed-article:20219951 | pubmed:status | MEDLINE | lld:pubmed |
| pubmed-article:20219951 | pubmed:month | Jun | lld:pubmed |
| pubmed-article:20219951 | pubmed:issn | 1522-1563 | lld:pubmed |
| pubmed-article:20219951 | pubmed:author | pubmed-author:RozengurtEnri... | lld:pubmed |
| pubmed-article:20219951 | pubmed:author | pubmed-author:YoungSteven... | lld:pubmed |
| pubmed-article:20219951 | pubmed:author | pubmed-author:SterniniCatia... | lld:pubmed |
| pubmed-article:20219951 | pubmed:author | pubmed-author:ReyOsvaldoO | lld:pubmed |
| pubmed-article:20219951 | pubmed:issnType | Electronic | lld:pubmed |
| pubmed-article:20219951 | pubmed:volume | 298 | lld:pubmed |
| pubmed-article:20219951 | pubmed:owner | NLM | lld:pubmed |
| pubmed-article:20219951 | pubmed:authorsComplete | Y | lld:pubmed |
| pubmed-article:20219951 | pubmed:pagination | C1401-13 | lld:pubmed |
| pubmed-article:20219951 | pubmed:dateRevised | 2011-7-28 | lld:pubmed |
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