Combination with SN-38 on human colon cancer LoVo cells.
- Author:
Yan WANG
1
;
Jian-ming XU
;
Qin-zhi XU
;
Ping-kun ZHOU
;
San-tai SONG
Author Information
- Publication Type:Journal Article
- MeSH: Antibodies, Monoclonal; pharmacology; Antibodies, Monoclonal, Humanized; Antineoplastic Agents, Phytogenic; pharmacology; Bevacizumab; Camptothecin; analogs & derivatives; pharmacology; Cell Hypoxia; Cell Line, Tumor; Cell Proliferation; drug effects; Colonic Neoplasms; metabolism; pathology; Drug Synergism; Extracellular Signal-Regulated MAP Kinases; metabolism; Humans; Hypoxia-Inducible Factor 1, alpha Subunit; genetics; metabolism; RNA, Messenger; metabolism; Signal Transduction; Time Factors; Vascular Endothelial Growth Factor A; genetics; metabolism
- From: Chinese Journal of Oncology 2009;31(10):746-851
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVETo observe the anti-proliferation effect of bevacizumab and SN-38 (active metabolite of irinotecan), and investigate the possible mechanisms of these two agents.
METHODSHuman colon cancer LoVo cells were cultured under hypoxic conditions. Inhibition of cell proliferation was evaluated by MTT assay. The drug modulation on HIF-1alpha, VEGF, ERK and AKT were assessed by the following assays. The mRNA expression of HIF-1alpha and VEGF were measured by RT-PCR. The protein expression of HIF-1alpha, ERK and AKT were evaluated by Western blot analysis, and VEGF by ELISA assay.
RESULTSAmong different combination schedules, Bevacizumab given after SN-38 show most synergistic anti-proliferation effect. Under hypoxic conditions, the expression of HIF-1alpha and VEGF increased as time accumulated, Bevacizumab combined with SN-38 almost completely inhibited the expression of HIF-1alpha and VEGF. Moreover, the MAP kinase pathway was involved in the drug modulation of HIF-1alpha and VEGF.
CONCLUSIONThese findings suggest the anti-proliferation effect of bevacizumab and SN-38 was schedule-dependent, and the synergistic effect of Bevacizumab and SN-38 was related to drug modulation of the HIF-1alpha and MAP kinase pathway.
