Regulation and mechanism of Notch signaling pathway in small cell lung cancer.
- Author:
Xiu-ming ZHANG
1
;
Jie-xin WANG
;
Xiao-guang LEI
;
Hui CHENG
;
Ling-ling WANG
;
Gen-you YAO
Author Information
- Publication Type:Journal Article
- MeSH: Basic Helix-Loop-Helix Transcription Factors; metabolism; Cell Line, Tumor; Cell Proliferation; Chromogranin A; metabolism; Homeodomain Proteins; metabolism; Humans; Lung Neoplasms; metabolism; pathology; Phosphopyruvate Hydratase; metabolism; Plasmids; Receptor, Notch1; metabolism; physiology; Recombinant Proteins; metabolism; Signal Transduction; Small Cell Lung Carcinoma; metabolism; pathology; Transcription Factor HES-1; Transfection
- From: Chinese Journal of Pathology 2010;39(2):95-99
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVETo investigate the status of Notch signaling pathway in small cell lung cancer (SCLC).
METHODSExpression plasmids of pEFBOS-NIC-MYC and pEFBOS-neo were transfected into NCI-H446 cells. Stably transfected cell lines were selected and their growth rates were examined by MTT method. Expression of downstream genes along the Notch signaling pathway were studied by RT-PCR. Protein expression of euroendocrine markers of CgA and NSE were detected by Western blot analysis and immunocytochemistry.
RESULTSThe expression of HES1 was increased in the pEFBOS-NIC-MYC group, but the expression of hASH in the pEFBOS-NIC-MYC group was decreased significantly. The transfected cells with pEFBOS-NIC-MYC plasmid showed a significantly slower growth rate compared with that of two control groups (P < 0.05, Student's t-test). Immunocytochemistry of NSE showed that PUs in the NIC transfected group, sham group and negative control group were 7.21 ± 0.59, 28.25 ± 1.46, 30.57 ± 1.31 respectively, the former one was smaller than the values of the latter two significantly (P < 0.01). Western blot analysis showed the grave scales of CgA in NIC transfected group and sham group to be 0.54 ± 0.03 and 0.99 ± 0.05 respectively (grave scales of the negative control was set as 1.00), the former one significantly smaller than that of the other two groups (P < 0.01). The grave scales of NSE in the NIC transfected group and sham group were 0.43 ± 0.02 and 1.07 ± 0.09 respectively (grave scales of the negative control was set as 1.00) and the former one was significantly smaller than the other two groups (P < 0.01).
CONCLUSIONNotch signaling pathway regulates SCLC cells through its inhibitory effect on hASH1 transcription via HES1 along with an expression inhibition of neuroendocrine markers in SCLC.