Transforming growth factor-β1 small interfering RNA inhibits growth of human embryonic lung fibroblast HFL-I cells in vitro and defends against radiation-induced lung injury in vivo

Lu,Zhonghua; Ma,Yan; Zhang,Shuyu; Liu,Fenju; Wan,Meizhen; Luo,Judong

doi:10.3892/mmr.2014.2923

March-2015 Volume 11 Issue 3

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March-2015 Volume 11 Issue 3

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Article

Transforming growth factor-β1 small interfering RNA inhibits growth of human embryonic lung fibroblast HFL-I cells in vitro and defends against radiation-induced lung injury in vivo

Authors:
- Zhonghua Lu
- Yan Ma
- Shuyu Zhang
- Fenju Liu
- Meizhen Wan
- Judong Luo
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Affiliations: Department of Radiotherapy, Changzhou Tumor Hospital, Soochow University, Changzhou, Jiangsu 213001, P.R. China, Jiangsu Provincial Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Soochow University, Suzhou, Jiangsu 215123, P.R. China
Pages: 2055-2061
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Published online on: November 11, 2014

https://doi.org/10.3892/mmr.2014.2923
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Abstract

In the present study, a human transforming growth factor‑β1 (TGF‑β1) small interfering RNA (siRNA) plasmid vector (TGF‑β1‑siRNA) was constructed to investigate its effects on the proliferation and differentiation of human lung fibroblasts in vitro and its interference effects on radiation‑induced lung injury in vivo. Reverse transcription quantitative polymerase chain reaction and enzyme linked immunosorbent assay revealed that the mRNA and protein expression of TGF‑β1 in the HFL‑I cells were inhibited by TGF‑β1‑siRNA and ﬂow cytometry demonstrated a significant increase in apoptosis of the HFL‑I cells. Adult, female, specific‑pathogen‑free C57BL/6 mice were used in the in vivo animal investigations and were randomly divided into the four following groups: control without any treatment, radiation alone, radiation followed by empty vector transfection and radiation followed by TGF‑β1‑siRNA vector transfection. Hematoxylin and eosin and Van‑Gieson staining revealed that certain radiation‑induced histopathological changes of the lung, including inflammation, edema, the density of surface pulmonary interstitial collagen fibers in the alveolar septum, TGF‑β1‑positive reactions in alveolar epithelial cells and pulmonary interstitial macrophages were less marked in the mice transfected with TGF‑β1‑siRNA compared with the mice without transfection or those transfected with empty vectors. The serum levels of TGF‑β1 levels in the irradiated mice increased significantly at four weeks and peaked at eight weeks after radiation, compared with the control. Serum levels of TGF‑β1 in the irradiated mice transfected with TGF‑β1‑siRNA also increased gradually and a significant difference was observed compared with those irradiated without transfection. The mRNA expression levels of TGF‑β1 in the mice transfected with TGF‑β1‑siRNA were markedly lower compared with those of the other radiation groups. The present study suggested that the TGF‑β1‑siRNA vector reduced the activity of TGF‑β1 by downregulating the mRNA expression of TGF‑β1 and thereby effectively suppressing inflammatory reactions and defending against radiation‑induced lung injury.

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Journals

International Journal of Molecular Medicine

International Journal of Oncology

Molecular Medicine Reports

Oncology Reports

Experimental and Therapeutic Medicine

Oncology Letters

Biomedical Reports

Molecular and Clinical Oncology

World Academy of Sciences Journal

International Journal of Functional Nutrition

International Journal of Epigenetics

Medicine International

Transforming growth factor-β1 small interfering RNA inhibits growth of human embryonic lung fibroblast HFL-I cells in vitro and defends against radiation-induced lung injury in vivo

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