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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

Expressão de genes e de proteínas envolvidos na biossíntese da matriz extracelular no tecido vaginal de mulheres com e sem prolapso de órgãos pélvicos / Expression of genes and proteins related to the extracellular matrix biogenesis in vaginal tissue of women with and without pelvic organ prolapse

Bortolini, Maria Augusta Tezelli [UNIFESP] 25 May 2011 (has links) (PDF)
Made available in DSpace on 2015-07-22T20:50:12Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-05-25. Added 1 bitstream(s) on 2015-08-11T03:26:12Z : No. of bitstreams: 1 Publico-12837a.pdf: 1258726 bytes, checksum: a7e0f280ec3b88f2f775c2b325704cd7 (MD5). Added 1 bitstream(s) on 2015-08-11T03:26:12Z : No. of bitstreams: 2 Publico-12837a.pdf: 1258726 bytes, checksum: a7e0f280ec3b88f2f775c2b325704cd7 (MD5) Publico-12837b.pdf: 2043061 bytes, checksum: 4edc37b57c73112ae7353868a78233ca (MD5). Added 1 bitstream(s) on 2015-08-11T03:26:12Z : No. of bitstreams: 3 Publico-12837a.pdf: 1258726 bytes, checksum: a7e0f280ec3b88f2f775c2b325704cd7 (MD5) Publico-12837b.pdf: 2043061 bytes, checksum: 4edc37b57c73112ae7353868a78233ca (MD5) Publico-12837c.pdf: 1773766 bytes, checksum: 56addbd5601cb4e7336afb640ed56fe8 (MD5) / Objetivo: O prolapso de órgãos pélvicos (POP) resulta da falha na sustentação do assoalho pélvico, e anormalidades do tecido conjuntivo podem estar envolvidas na etiologia e/ou na progressão da disfunção. Analisar-se-á a expressão diferencial de genes e de proteínas que participam da biossíntese do colágeno e da elastina: lisil oxidases (LOXs), fibulina-5, fibrilinas-1 e -2 e pró-colágeno C proteinase (PCP/BMP1), no tecido vaginal de mulheres sem e com POP acentuado consoante seu estado hormonal. Casuística e Métodos: Durante a histerectomia total, biópsias de parede vaginal anterior foram obtidas de mulheres caucasianas na pré-menopausa (fase proliferativa do ciclo menstrual) e na pós-menopausa com POP acentuado (POPQ estadio III e IV), e de controles assintomáticas (POPQ 0). RNAm e proteínas totais foram extraídos usando Trizol e RIPA Buffer, e os genes e proteínas de interesse quantificados por RT-PCR em tempo real e Imunobloting, respectivamente. As seguintes análises comparativas foram realizadas: (1) expressão dos genes e das proteínas da família LOX (LOX e LOXL1-4), fibulina-5 e fibrilinas- 1 e -2 em pacientes na pré-menopausa com e sem POP; (2) expressão do gene e da proteína PCP/BMP1 em pacientes na pré- e pós-menopausa com POP, e respectivos controles. Os testes de Wilcoxon signed-rank e Fisher foram usados para as análises estatísticas (p<0.05). Resultados: Obtivemos amostras de 15 pacientes e 11 controles na pré-menopausa para o estudo (1), e 39 pacientes na pré-menopausa (POP=23 e Controle=16) e 18 na pósmenopausa (POP=13 e Controle=5) para o estudo (2). A partir das análises, observamos (1) diminuição significativa na expressão dos genes LOX, LOXL1 e LOXL3, bem como nas proteínas LOX e LOXL3 no tecido vaginal de pacientes POP na pré-menopausa comparadas com mulheres assintomáticas (p<0.05); (2) hipoexpressão do gene PCP/BMP1 nos tecidos vaginais de mulheres com POP acentuado comparadas com controles, tanto na prémenopausa como na pós-menopausa (ambos p=0.01); redução significativa das isoformas 130kDa, 92,5kDa e 82,5kDa da PCP/BMP1 no tecido vaginal de pacientes na pósmenopausa (p=0.01), bem como hiperexpressão da isoforma 130kDa nas mulheres com POP acentuado na pré-menopausa (p=0.009), comparadas com as respectivas controles. Conclusão: As expressões das enzimas LOXs e pró-colágeno C proteinase estão alteradas no tecido vaginal de mulheres com POP, e são moduladas pelo estado hormonal. A alteração na regulação destas enzimas, envolvidas na biossíntese da matriz extracelular, pode contribuir para deficiente síntese do tecido conjuntivo e do suporte vaginal, e estar envolvida no desenvolvimento do POP. / Objective: Pelvic organ prolapse (POP) results from the failure of pelvic floor support, and connective tissue abnormalities may be involved in the etiology and/or progression of the dysfunction. We aimed to analyze the differential expression of genes and proteins related to the collagen and elastin biogenesis: lysyl oxidases (LOXs), fibulin-5, fibrillin -1 and -2, and procollagen C proteinase (PCP/BMP1) in vaginal tissue of women without and with advanced POP controlled by hormonal status. Materials and Methods: During total hysterectomy, anterior vaginal wall biopsies were obtained from Caucasian premenopausal women (proliferative phase of menstrual cycle) and postmenopausal women with severe POP (POPQ stage III and IV) and asymptomatic controls (POPQ 0). Total mRNA and protein were extracted using Trizol and RIPA buffer, and the genes and proteins of interest were quantified by real-time RT-PCR and Immunoblotting, respectively. The following analysis were performed: (1) expression of LOX family genes and proteins (LOX and LOXL1-4), fibulin-5, fibrillin-1 and -2 in premenopausal women with and without POP; (2) PCP/BMP1 gene and protein expression in vaginal tissue of pre- and postmenopausal POP women, and respective controls. Wilcoxon signed-rank and Fisher tests were used for statistical analysis (p<0.05). Results: Samples from 15 premenopausal patients and 11 controls were obtained for study (1); 39 premenopausal (POP=23 and Control=16) and 18 postmenopausal women samples (POP=13 and Control=5) for study (2). We observed: (1) significant decrease in expression of LOX, LOXL1 and LOXL3 genes, as well as LOX and LOXL3 proteins in vaginal tissue of premenopausal POP patients compared with asymptomatic women (p<0.05); (2) PCP/BMP1 gene downregulation in the vagina of women with severe POP compared with controls, in both premenopausal and postmenopausal phase (both p=0.01); significant reduction of 130 kDa, 92.5 kDa and 82.5 kDa PCP/BMP1 isoforms in vaginal tissue of postmenopausal patients (p=0.01), and 130 kDa isoform upregulation in premenopausal women with severe POP (p=0.009), compared with their respective controls. Conclusion: The expression of LOXs enzymes and PCP/BMP1 are altered in vaginal tissue of women with severe POP, and are modulated by hormonal status. Dysregulation of these enzymes involved in the extracellular matrix biogenesis may contribute to impaired tissue and vaginal support, and may be involved in POP development. / TEDE / BV UNIFESP: Teses e dissertações

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