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Effect of TRPV1 channel on proliferation and apoptosis of airway smooth muscle cells of rats

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Summary

Airway remodeling is an important pathological feature of asthma and the basis of severe asthma. Proliferation of airway smooth muscle cells (ASMCs) is a major contributor to airway remodeling. As an important Ca2+ channel, transient receptor potential vanilloid 1 (TRPV1) plays the key role in the cell pathological and physiological processes. This study investigated the expression and activity of TRPV1 channel, and further clarified the effect of TRPV1 channel on the ASMCs proliferation and apoptosis in order to provide the scientific basis to treat asthmatic airway remodeling in clinical practice. Immunofluorescence staining and reverse transcription polymerase chain reaction (RT-PCR) were used to detect the expression of TRPV1 in rat ASMCs. Intracellular Ca2+ was detected using the single cell confocal fluorescence microscopy measurement loaded with Fluo-4/AM. The cell cycles were observed by flow cytometry. MTT assay and Hoechst 33258 staining were used to detect the proliferation and apoptosis of ASMCs in rats respectively. The data showed that: (1) TRPV1 channel was present in rat ASMCs. (2) TRPV1 channel agonist, capsaicin, increased the Ca2+ influx in a concentration-dependent manner (EC50=284.3±58 nmol/L). TRPV1 channel antagonist, capsazepine, inhibited Ca2+ influx in rat ASMCs. (3) Capsaicin significantly increased the percentage of S+G2M ASMCs and the absorbance of MTT assay. Capsazepine had the opposite effect. (4) Capsaicin significantly inhibited the apoptosis, whereas capsazepine had the opposite effect. These results suggest that TRPV1 is present and mediates Ca2+ influx in rat ASMCs. TRPV1 activity stimulates proliferation of ASMCs in rats.

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Authors and Affiliations

  1. Department of Respiratory and Critical Care Medicine, Zhengzhou University People’s Hospital, Zhengzhou, 450003, China

    Li-min Zhao  (赵丽敏), Hong-yan Kuang  (况红艳), Luo-xian Zhang  (张罗献), Ji-zhen Wu  (吴纪珍), Xian-liang Chen  (陈献亮), Xiao-yu Zhang  (张晓宇) & Li-jun Ma  (马利军)

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  1. Li-min Zhao  (赵丽敏)
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  2. Hong-yan Kuang  (况红艳)
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  3. Luo-xian Zhang  (张罗献)
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  4. Ji-zhen Wu  (吴纪珍)
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  5. Xian-liang Chen  (陈献亮)
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  6. Xiao-yu Zhang  (张晓宇)
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  7. Li-jun Ma  (马利军)
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Correspondence to Li-jun Ma  (马利军).

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The authors contributed equally to this work.

This project was supported by the National Natural Science Foundation of China (No. 81100029).

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Zhao, Lm., Kuang, Hy., Zhang, Lx. et al. Effect of TRPV1 channel on proliferation and apoptosis of airway smooth muscle cells of rats. J. Huazhong Univ. Sci. Technol. [Med. Sci.] 34, 504–509 (2014). https://doi.org/10.1007/s11596-014-1306-0

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  • DOI: https://doi.org/10.1007/s11596-014-1306-0

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