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收稿:2019-02-02,
纸质出版:2019-08-15
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赵岗, 张哲莹, 杜宝顺, 等. LAPTM4B在胶质瘤组织中表达及对细胞增殖和侵袭力的影响[J]. 第三军医大学学报, 2019,41(15):1431-1437.
Gang ZHAO, Zheying ZHANG, Baoshun DU, et al. Expression of LAPTM4B in glioma tissues and its effect on cell proliferation and invasion[J]. Journal of Third Military Medical University, 2019, 41(15): 1431-1437.
赵岗, 张哲莹, 杜宝顺, 等. LAPTM4B在胶质瘤组织中表达及对细胞增殖和侵袭力的影响[J]. 第三军医大学学报, 2019,41(15):1431-1437. DOI: 10.16016/j.1000-5404.201902004.
Gang ZHAO, Zheying ZHANG, Baoshun DU, et al. Expression of LAPTM4B in glioma tissues and its effect on cell proliferation and invasion[J]. Journal of Third Military Medical University, 2019, 41(15): 1431-1437. DOI: 10.16016/j.1000-5404.201902004.
Objective
2
To detect the protein expression of lysosome-associated protein transmembrane-4 beta (LAPTM4B) in glioma tissues
and to determine its effect on cell proliferation and invasiveness and its correlation with prognosis.
Methods
2
A total of 86 glioma patients who underwent surgical resection in our hospital from June 2011 to June 2015 were recruited in this study
and they were followed up till June 30
2018. In the same period
25 cases of normal brain tissues were selected. Immunohistochemical assay (SP) was used to detect LAPTM4B protein expression in gliomas and normal brain tissues. Kaplan-Meier analysis and Log-Rank test were performed for survival analysis. Cox proportional hazards model analysis was carried out for risk factors affecting prognosis. U251 cells were cultured and divided into siRNA-LAPTM4B group
siRNA-NC group and blank group. The expression of LAPTM4B in the cells was detected by real-time fluorescent quantitative PCR. Cell proliferation was detected by MTT assay and colony formation assay. Cell migration and invasion was detected by Transwell assay. The protein levels of LAPTM4B
E-cadherin
N-cadherin and Vimentin were detected by Western blotting.
Results
2
The positive rate of LAPTM4B protein was 77.91% in glioma tissues
which was higher by 28.00% than that in the normal brain tissues (
P
<
0.001). The positive expression rate of LAPTM4B protein had statistical difference with different WHO grades (
P
<
0.05). Kaplan-Meier survival analysis showed that the median survival time and cumulative survival rate were significantly lower in the LAPTM4B-positive group than the negative group (
P
=0.002). Cox proportional hazard model analysis indicated that WHO classification and LAPTM4B protein expression were risk factors for prognosis of glioma patients (
P
<
0.05). Compared with the siRNA-NC group and the blank group
the relative expression of LAPTM4B at mRNA and protein levels were decreased in the siRNA-LAPTM4B group (
P
<
0.05)
and the cell proliferation at 24
48
72 and 96 h
the numbers of cellular clone
migrated cells and invasive cells
and protein levels of N-cadherin and Vimentin were decreased
while the level of E-cadherin protein was increased in the siRNA-LAPTM4B group (all
P
<
0.05).
Conclusion
2
LAPTM4B protein is highly expressed in glioma tissues
and promotes cell proliferation and invasion
which may be associated with epithelial-mesenchymal transition. Its expression level is correlated with prognosis of the patients.
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