RESUMEN
OBJECTIVE: To establish a molecular marking method to identify Pinellia ternata and Typhonium flagelliforme. METHODS: Twenty-two random oligonucleotide primers were used in RAPD analysis on the genomic DNA of two types of Pinellia ternata in Sichuan and two types of Typhonium flagelliforme in Guangxi. The special fragments were sequenced, marked as probes and then conducted Southern blot. RESULTS: A great deal of special bands was found between Pinellia ternata and Typhonium flagelliforme. A Pinellia ternata specific molecule was screened. CONCLUSION: RAPD analysis and specific DNA probes show potential value in the identification of Pinellia ternata and Typhonium flagelliforme.
Asunto(s)
Sondas de ADN , ADN de Plantas/genética , Pinellia/genética , Plantas Medicinales/genética , Técnica del ADN Polimorfo Amplificado Aleatorio , China , Genoma de Planta , Pinellia/clasificación , Hojas de la Planta/genética , Raíces de Plantas/genética , Reacción en Cadena de la Polimerasa , Polimorfismo Genético , Análisis de Secuencia de ADN , Especificidad de la EspecieRESUMEN
AIM: To determine the inhibitory effect of the vector-generated small interfering RNAs (siRNAs) on the expression of the Bcl-X(L) gene in established human esophageal cancer cells, and to investigate the effect of the Bcl-X(L) siRNAs on cell growth and apoptosis in esophageal cancer cells. METHODS: Three siRNA-expressing vectors targeting different sites of the Bcl-X(L) gene were constructed from pTZ-U6+1 vector. Cultured esophageal cancer cells were transfected with the siRNA-expressing vector (or the control vector) using lipofectamine 2000. Bcl-X(L) gene expression was determined with semiquantitative RT-PCR assay and Western blotting. Among the three siRNA-expressing vectors, the most highly functional vector and its effect on cell growth and apoptosis in esophageal cancer cells was further analyzed. RESULTS: Of the three siRNA-expressing vectors, siRNA-expressing vector No.1 was the most potent one which suppressed Bcl-X(L) mRNA production to 32.5% of that in the untreated esophageal cancer cells. Western blotting analysis showed that siRNA-expressing vector No.1 markedly down-regulated the expression of Bcl-X(L) in human esophageal cancer cells. Treatment of esophageal cancer cells with siRNA-expressing vector No.1 resulted in inhibition of cell growth and induction of apoptosis. CONCLUSION: Down-regulation of Bcl-X(L) by vector-generated small interfering RNAs can suppress cell growth and induce apoptosis in human esophageal cancer cells.