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Involvement of TRPC channels in lung cancer cell differentiation and the correlation analysis in human non-small cell
Hong-Ni Jiang1, Bo Zeng, Yi Zhang
1Department of Pulmonary Medicine, Zhongshan Hospital, School of Medicine, Fudan University, Shanghai, China.
Abstract:
The canonical transient receptor potential (TRPC) channels are Ca(2+)-permeable cationic channels controlling the Ca(2+) influx evoked by G protein-coupled receptor activation and/or by Ca(2+) store depletion. Here we investigate the involvement of TRPCs in the cell differentiation of lung cancer. The expression of TRPCs and the correlation to cancer differentiation grade in non-small cell lung cancer (NSCLC) were analyzed by real-time PCR and immunostaining using tissue microarrays from 28 patient lung cancer samples. The association of TRPCs with cell differentiation was also investigated in the lung cancer cell line A549 by PCR and Western blotting. The channel activity was monitored by Ca(2+) imaging and patch recording after treatment with all-trans-retinoic acid (ATRA). The expression of TRPC1, 3, 4 and 6 was correlated to the differentiation grade of NSCLC in patients, but there was no correlation to age, sex, smoking history and lung cancer cell type. ATRA upregulated TRPC3, TRPC4 and TRPC6 expression and enhanced Ca(2+) influx in A549 cells, however, ATRA showed no direct effect on TRPC channels. Inhibition of TRPC channels by pore-blocking antibodies decreased the cell mitosis, which was counteracted by chronic treatment with ATRA. Blockade of TRPC channels inhibited A549 cell proliferation, while overexpression of TRPCs increased the proliferation. We conclude that TRPC expression correlates to lung cancer differentiation. TRPCs mediate the pharmacological effect of ATRA and play important roles in regulating lung cancer cell differentiation and proliferation, which gives a new understanding of lung cancer biology and potential anti-cancer therapy.
Insights
Canonical transient receptor potential (TRPC) channels are linked to lung cancer differentiation. TRPC expression influences cell proliferation and mediates therapeutic effects, offering new insights into lung cancer biology and treatment.
Area of Science:
- Molecular Biology
- Oncology
- Ion Channel Physiology
Background:
- Canonical transient receptor potential (TRPC) channels regulate calcium (Ca2+) influx, crucial for cellular processes.
- TRPC channels are implicated in various cellular functions, but their role in lung cancer differentiation remains underexplored.
Purpose of the Study:
- To investigate the involvement of TRPC channels in non-small cell lung cancer (NSCLC) cell differentiation.
- To analyze the correlation between TRPC expression and NSCLC differentiation grade.
- To explore the role of TRPC channels in mediating the effects of all-trans-retinoic acid (ATRA) on lung cancer cells.
Main Methods:
- Real-time PCR and immunostaining on patient tissue microarrays (n=28) to assess TRPC expression and correlate with differentiation grade.
- PCR and Western blotting in A549 lung cancer cell line to study TRPC expression.
- Calcium imaging and patch recording to monitor TRPC channel activity after ATRA treatment.
- Functional assays involving TRPC channel inhibition and overexpression to assess effects on cell proliferation and mitosis.
Main Results:
- TRPC1, TRPC3, TRPC4, and TRPC6 expression levels correlated significantly with NSCLC differentiation grade.
- No correlation was found between TRPC expression and patient age, sex, smoking history, or lung cancer cell type.
- ATRA upregulated TRPC3, TRPC4, and TRPC6 expression and enhanced Ca2+ influx in A549 cells, without directly affecting TRPC channels.
- TRPC channel inhibition decreased cell mitosis and proliferation, effects counteracted by ATRA; conversely, TRPC overexpression increased proliferation.
Conclusions:
- TRPC channel expression is significantly correlated with the differentiation status of non-small cell lung cancer.
- TRPC channels are key mediators of ATRA's pharmacological effects on lung cancer cells.
- TRPC channels play critical roles in regulating lung cancer cell differentiation and proliferation, presenting potential therapeutic targets.
