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| Silberstein,C.; Kierbel,A.; Amodeo,G.; Zotta,E.; Bigi,F.; Berkowski,D.; Ibarra,C.. |
| Water channels or aquaporins (AQPs) have been identified in a large variety of tissues. Nevertheless, their role in the human gastrointestinal tract, where their action is essential for the reabsorption and secretion of water and electrolytes, is still unclear. The purpose of the present study was to investigate the structure and function of water channels expressed in the human colon. A cDNA fragment of about 420 bp with a 98% identity to human AQP3 was amplified from human stomach, small intestine and colon by reverse transcription polymerase chain reaction (RT-PCR) and a transcript of 2.2 kb was expressed more abundantly in colon than in jejunum, ileum and stomach as indicated by Northern blots. Expression of mRNA from the colon of adults and children... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Absorptive epithelium; Human colon; Water channels; Aquaporins; AQP3. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999001000018 |
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| Bigi,F.; Taboga,O.; Romano,M.I.; Alito,A.; Fisanotti,J.C.; Cataldi,A.A.. |
| In the present study we evaluated different systems for the expression of mycobacterial antigen P36 secreted by Mycobacterium bovis. P36 was detected by Western blot using a specific antiserum. The P36 gene was initially expressed in E. coli, under the control of the T7 promoter, but severe proteolysis prevented its purification. We then tried to express P36 in M. smegmatis and insect cells. For M. smegmatis, we used three different plasmid vectors differing in copy number and in the presence of a promoter for expression of heterologous proteins. P36 was detected in the cell extract and culture supernatant in both expression systems and was recognized by sera from M. bovis-infected cattle. To compare the expression level and compartmentalization, the MPB70... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mycobacterium tuberculosis; Mycobacterium smegmatis; Insect cells; Baculovirus; Secreted proteins; P36; MPB70; Antigen. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999000100004 |
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