The Lactate Dehydrogenase Inhibitor Gossypol Inhibits Radiation-Induced Pulmonary Fibrosis
| Autor: | Eric Hernady, Richard P. Phipps, Patricia J. Sime, Jennifer L. Judge, Wei-Yao Ku, Thomas H. Thatcher, Shannon H. Lacy, Jacqueline P. Williams, R. Matthew Kottmann, Kristina M. Owens |
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| Rok vydání: | 2017 |
| Předmět: |
Male
0301 basic medicine Pathology medicine.medical_specialty Pulmonary Fibrosis medicine.medical_treatment Biophysics Radiation-Protective Agents Biology Radiation Dosage Radiation Tolerance Article Extracellular matrix Mice 03 medical and health sciences chemistry.chemical_compound Radiation Protection 0302 clinical medicine Fibrosis Lactate dehydrogenase Pulmonary fibrosis medicine Extracellular Animals Radiology Nuclear Medicine and imaging Radiation Lung Dose-Response Relationship Drug L-Lactate Dehydrogenase Gossypol medicine.disease Mice Inbred C57BL Radiation Pneumonitis Treatment Outcome 030104 developmental biology medicine.anatomical_structure Cytokine chemistry 030220 oncology & carcinogenesis Cancer research Cytokines |
| Zdroj: | Radiation Research. 188:35-43 |
| ISSN: | 1938-5404 0033-7587 |
| DOI: | 10.1667/rr14620.1 |
| Popis: | Exposure of the lung to ionizing radiation that occurs in radiotherapy, as well as after accidental or intentional mass casualty incident can result in pulmonary fibrosis, which has few treatment options. Pulmonary fibrosis is characterized by an accumulation of extracellular matrix proteins that create scar tissue. Although the mechanisms leading to radiation-induced pulmonary fibrosis remain poorly understood, one frequent observation is the activation of the profibrotic cytokine transforming growth factor-beta (TGF-β). Our laboratory has shown that the metabolite lactate activates latent TGF-β by a reduction in extracellular pH. We recently demonstrated that lactate dehydrogenase-A (LDHA), the enzyme that produces lactate, is upregulated in patients with radiation-induced pulmonary fibrosis. Furthermore, genetic silencing of LDHA or pharmacologic inhibition using the LDHA inhibitor gossypol prevented radiation-induced extracellular matrix secretion in vitro through inhibition of TGF-β activation. In the current study, we hypothesized that LDHA inhibition in vivo prevents radiation-induced pulmonary fibrosis. To test this hypothesis, C57BL/6 mice received 5 Gy total-body irradiation plus 10 Gy thoracic irradiation from a 137Cs source to induce pulmonary fibrosis. Starting at 4 weeks postirradiation, mice were treated with 5 mg/kg of the LDHA inhibitor gossypol or vehicle daily until sacrifice at 26 weeks postirradiation. Exposure to radiation resulted in pulmonary fibrosis, characterized by an increase in collagen content, fibrosis area, extracellular matrix gene expression and TGF-β activation. Irradiated mice treated with gossypol had significantly reduced fibrosis outcomes, including reduced collagen content in the lungs, reduced expression of active TGF-β, LDHA and the transcription factor hypoxia-inducible factor-1 alpha (HIF-1α). These findings suggest that inhibition of LDHA protects against radiation-induced pulmonary fibrosis, and may be a novel therapeutic strategy for radiation-induced pulmonary fibrosis. |
| Databáze: | OpenAIRE |
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