title: Effect of siRNA targeting HIF-1alpha combined L-ascorbate on biological behavior of hypoxic MiaPaCa2 cells.
abstract: The aim of the study was to observe the effect of small interference RNA (siRNA) targeting hypoxia-inducible factor 1alpha (HIF-1alpha) combined L-ascorbate on proliferation, migration, and apoptosis of hypoxic MiaPaCa2 human pancreatic cancer cells. A cassette encoding siRNA targeting HIF-1alpha mediated by recombinant adeno-associated virus (rAAV) was constructed, giving rAAV-siHIF. rAAV-siHIF and L-ascorbate, which were used alone or in combination, were delivered to exponentially growing MiaPaCa2 cells under hypoxic conditions. Then, we observed the expression of HIF-1alpha mRNA and protein, the proliferation, apoptosis, and migration of MiaPaCa2 cells by real-time PCR, Western blot, MTT, TUNEL, and Transwell assay, respectively. Under hypoxic conditions, rAAV-siHIF inhibited the expression of HIF-1alpha mRNA in MiaPaCa2 cells but L-ascorbate did not. However, rAAV-siHIF and L-ascorbate both inhibited the expression of HIF-1alpha protein and the proliferation and migration of MiaPaCa2 cells and induced MiaPaCa2 cell apoptosis. The effect in the combined group was more efficient than that seen when rAAV-siHIF or L-ascorbate was used separately. rAAV-siHIF and L-ascorbate both affect biological behavior of hypoxic MiaPaCa2 cells through modulating HIF-1alpha protein expression and rAAV-siHIF and L-ascorbate have synergy under hypoxic conditions.
authors.affiliation: Department of Esophageal Cancer, TianJin Medical University, Cancer Institute and Hospital, TianJin 300060, China.
authors.forename: C
authors.initials: C
authors.lastname: Chen
authors.forename: P
authors.initials: P
authors.lastname: Tang
authors.forename: J
authors.initials: J
authors.lastname: Yue
authors.forename: P
authors.initials: P
authors.lastname: Ren
authors.forename: X
authors.initials: X
authors.lastname: Liu
authors.forename: X
authors.initials: X
authors.lastname: Zhao
authors.forename: Z
authors.initials: Z
authors.lastname: Yu
mesh_terms: D017209:Apoptosis; D001205:Ascorbic Acid / Q000494:pharmacology*; D015687:Cell Hypoxia; D002465:Cell Movement; D049109:Cell Proliferation; D000229:Dependovirus / Q000235:genetics; D006801:Humans; D051795:Hypoxia-Inducible Factor 1, alpha Subunit / Q000037:antagonists & inhibitors / Q000235:genetics / Q000502:physiology*; D010190:Pancreatic Neoplasms / Q000473:pathology*; D034741:RNA, Small Interfering / Q000235:genetics*; D014407:Tumor Cells, Cultured
chemical_list: C497442:HIF1A protein, human; D051795:Hypoxia-Inducible Factor 1, alpha Subunit; D034741:RNA, Small Interfering; D001205:Ascorbic Acid