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Published on: July 21, 2018
MAPK4 facilitates angiogenesis by inhibiting the ERK pathway in non-small cell lung cancer
Jing Chen1,2, Jing Yang1,2, Yufang Liu1,2
1Special Key Laboratory of Gene Detection & Therapy of Guizhou Province Zunyi Guizhou China.
Background:
Angiogenesis plays an important role in the occurrence and development of non-small cell lung cancer (NSCLC). The atypical mitogen-activated protein kinase 4 (MAPK4) has been shown to be involved in the pathogenesis of various diseases. However, the potential role of MAPK4 in the tumor angiogenesis of NSCLC remains unclear.
Methods:
Adult male C57BL/6 wild-type mice were randomly divided into the control group and p-siMAPK4 intervention group, respectively. The cell proliferation was analyzed with flow cytometry and immunofluorescence staining. The vascular density in tumor mass was analyzed by immunofluorescence staining. The expressions of MAPK4 and related signaling molecules were detected by western blot analysis and immunofluorescence staining, and so on.
Results:
We found that the expression of MAPK4, which was dominantly expressed in local endothelial cells (ECs), was correlated with tumor angiogenesis of NSCLC. Furthermore, MAPK4 silencing inhibited the proliferation and migration abilities of human umbilical vein ECs (HUVECs). Global gene analysis showed that MAPK4 silencing altered the expression of multiple genes related to cell cycle and angiogenesis pathways, and that MAPK4 silencing increased transduction of the extracellular regulated protein kinases 1/2 (ERK1/2) pathway but not Akt and c-Jun n-terminal kinase pathways. Further analysis showed that MAPK4 silencing inhibited the proliferation and migration abilities of HUVECs cultured in tumor cell supernatant, which was accompanied with increased transduction of the ERK1/2 pathway. Clinical data analysis suggested that the higher expression of MAPK4 and CD34 were associated with poor prognosis of patients with NSCLC. Targeted silencing of MAPK4 in ECs using small interfering RNA driven by the CD34 promoter effectively inhibited tumor angiogenesis and growth of NSCLC in vivo.
Conclusion:
Our results reveal that MAPK4 plays an important role in the angiogenesis and development of NSCLC. MAPK4 may thus represent a new target for NSCLC.
Insights
Mitogen-activated protein kinase 4 (MAPK4) promotes non-small cell lung cancer (NSCLC) angiogenesis. Silencing MAPK4 inhibits tumor growth and may offer a new therapeutic target for NSCLC patients.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Research
Background:
- Angiogenesis is crucial for non-small cell lung cancer (NSCLC) development.
- The role of atypical mitogen-activated protein kinase 4 (MAPK4) in NSCLC tumor angiogenesis is not well understood.
Purpose of the Study:
- To investigate the role of MAPK4 in NSCLC angiogenesis.
- To explore MAPK4 as a potential therapeutic target for NSCLC.
Main Methods:
- Mice models and human umbilical vein endothelial cells (HUVECs) were used.
- MAPK4 expression and its effects on cell proliferation, migration, and angiogenesis-related pathways were analyzed.
- Western blot, immunofluorescence, and flow cytometry were employed.
Main Results:
- MAPK4 expression in endothelial cells correlated with NSCLC tumor angiogenesis.
- MAPK4 silencing inhibited HUVEC proliferation and migration, affecting cell cycle and angiogenesis pathways.
- Higher MAPK4 and CD34 expression indicated poor prognosis in NSCLC patients.
Conclusions:
- MAPK4 plays a significant role in NSCLC angiogenesis and development.
- Targeted silencing of MAPK4 effectively inhibited tumor growth in vivo.
- MAPK4 presents a promising new therapeutic target for NSCLC.
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