pubmed-article:17220308 | rdf:type | pubmed:Citation | lld:pubmed |
pubmed-article:17220308 | lifeskim:mentions | umls-concept:C0033809 | lld:lifeskim |
pubmed-article:17220308 | lifeskim:mentions | umls-concept:C0085080 | lld:lifeskim |
pubmed-article:17220308 | lifeskim:mentions | umls-concept:C0031308 | lld:lifeskim |
pubmed-article:17220308 | lifeskim:mentions | umls-concept:C1171362 | lld:lifeskim |
pubmed-article:17220308 | lifeskim:mentions | umls-concept:C0205419 | lld:lifeskim |
pubmed-article:17220308 | lifeskim:mentions | umls-concept:C0017262 | lld:lifeskim |
pubmed-article:17220308 | lifeskim:mentions | umls-concept:C1420003 | lld:lifeskim |
pubmed-article:17220308 | lifeskim:mentions | umls-concept:C1420002 | lld:lifeskim |
pubmed-article:17220308 | lifeskim:mentions | umls-concept:C1515670 | lld:lifeskim |
pubmed-article:17220308 | pubmed:issue | 3 | lld:pubmed |
pubmed-article:17220308 | pubmed:dateCreated | 2007-2-22 | lld:pubmed |
pubmed-article:17220308 | pubmed:abstractText | Surfactant protein A (SP-A) enhances phagocytosis of Pseudomonas aeruginosa. Two functional genes, SP-A1 and SP-A2, encode human SP-A. As we showed before, baculovirus-mediated insect cell-expressed SP-A2 enhances the association of P. aeruginosa with rat alveolar macrophages (rAMs) more than does SP-A1. However, true phagocytosis (internalization) was not shown, and insect cell derived proteins lack or are defective in certain mammalian posttranslational modifications that may be important for SP-A1 and SP-A2 activity and specificity. Here we used SP-A1 (6A(2), 6A(4)) and SP-A2 (1A(0), 1A(1)) allele variants expressed by CHO (Chinese hamster ovary) mammalian cells to study their effect on association and/or internalization of P. aeruginosa by rAMs and/or human AMs (hAMs) and to study if phagocytosis can be modulated differentially and/or more effectively by CHO cell-expressed SP-A variants than by insect-cell expressed SP-A variants. For cell association and internalization assessments, light microscopy and fluorescence-activated cell sorter analyses were used, respectively. We found the following for the first time. (i) SP-A2 variants enhanced phagocytosis (cell association and/or internalization) of P. aeruginosa more than SP-A1 variants did, and the cell association correlated with internalization. (ii) Differences in the activities of SP-A variants were observed in the following order: 1A(1)>1A(0)>6A(2)>6A(4). (iii) rAMs, although more active than hAMs, are an appropriate model, as SP-A2 variants exhibited activity higher than that seen for SP-A1 variants with either rAMs or hAMs. (iv) CHO cell-expressed SP-A was considerably more active than insect cell-expressed variants. We conclude that SP-A2 variants stimulate phagocytosis of P. aeruginosa more effectively than SP-A1 variants and that posttranslational modifications positively influence the phagocytic activity of SP-A. | lld:pubmed |
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pubmed-article:17220308 | pubmed:language | eng | lld:pubmed |
pubmed-article:17220308 | pubmed:journal | http://linkedlifedata.com/r... | lld:pubmed |
pubmed-article:17220308 | pubmed:citationSubset | IM | lld:pubmed |
pubmed-article:17220308 | pubmed:chemical | http://linkedlifedata.com/r... | lld:pubmed |
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pubmed-article:17220308 | pubmed:chemical | http://linkedlifedata.com/r... | lld:pubmed |
pubmed-article:17220308 | pubmed:status | MEDLINE | lld:pubmed |
pubmed-article:17220308 | pubmed:month | Mar | lld:pubmed |
pubmed-article:17220308 | pubmed:issn | 0019-9567 | lld:pubmed |
pubmed-article:17220308 | pubmed:author | pubmed-author:WangGuirongG | lld:pubmed |
pubmed-article:17220308 | pubmed:author | pubmed-author:UmsteadTodd... | lld:pubmed |
pubmed-article:17220308 | pubmed:author | pubmed-author:PhelpsDavid... | lld:pubmed |
pubmed-article:17220308 | pubmed:author | pubmed-author:FlorosJoannaJ | lld:pubmed |
pubmed-article:17220308 | pubmed:author | pubmed-author:ThomasNeal... | lld:pubmed |
pubmed-article:17220308 | pubmed:author | pubmed-author:ZacharatosMar... | lld:pubmed |
pubmed-article:17220308 | pubmed:author | pubmed-author:MikerovAnatol... | lld:pubmed |
pubmed-article:17220308 | pubmed:issnType | Print | lld:pubmed |
pubmed-article:17220308 | pubmed:volume | 75 | lld:pubmed |
pubmed-article:17220308 | pubmed:owner | NLM | lld:pubmed |
pubmed-article:17220308 | pubmed:authorsComplete | Y | lld:pubmed |
pubmed-article:17220308 | pubmed:pagination | 1403-12 | lld:pubmed |
pubmed-article:17220308 | pubmed:dateRevised | 2009-11-18 | lld:pubmed |
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