RESUMEN
Radiationinduced lung tissue injury is an important reason for the limited application of radiotherapy on thoracic malignancies. Previously, we reported that administration of JiaweiMaxingShigan decoction (JMSD) attenuated the radiationinduced epithelialmesenchymal transition (EMT) in alveolar epithelial cells (AECs) via TGFß/Smad signaling. The present study aimed to examine the role of protein phosphatase Mg2+/Mn2+dependent 1A (PPM1A) in the antiEMT activity of JMSD on AECs. The components in the aqueous extract of JMSD were identified by highperformance liquid chromatography coupled with electrospray mass spectrometry. Primary rat type II AECs were treated with radiation (60Co γray at 8 Gy) and JMSDmedicated serum. PPM1A was overexpressed and knocked down in the AECs via lentivirus transduction and the effects of JMSD administration on the key proteins related to TGFß1/Smad signaling were measured by western blotting. It was found that radiation decreased the PPM1A expression in the AECs and JMSDmedicated serum upregulated the PPM1A expressions in the radiationinduced AECs. PPM1A overexpression increased the Ecadherin level but decreased the phosphorylated (p)Smad2/3, vimentin and αsmooth muscle actin (αSMA) levels in the AECs. By contrast, the PPM1A knockdown decreased the Ecadherin level and increased the pSmad2/3, vimentin and αSMA levels in the AECs and these effects could be blocked by SB431542 (TGFß1/Smad signaling inhibitor). JMSD administration increased the Ecadherin level and decreased the pSmad2/3, vimentin and αSMA levels in the AECs; however, these effects could be blocked by siPPM1A2. In conclusion, PPM1A is a key target of JMSD administration for the attenuation of the radiationinduced EMT in primary type II AECs via the TGFß1/Smad pathway.
Asunto(s)
Células Epiteliales Alveolares/efectos de los fármacos , Células Epiteliales Alveolares/metabolismo , Medicamentos Herbarios Chinos/química , Medicamentos Herbarios Chinos/farmacología , Transición Epitelial-Mesenquimal/efectos de los fármacos , Transición Epitelial-Mesenquimal/efectos de la radiación , Proteína Fosfatasa 2C/metabolismo , Células Epiteliales Alveolares/efectos de la radiación , Animales , Cromatografía Líquida de Alta Presión , Regulación de la Expresión Génica/efectos de los fármacos , Regulación de la Expresión Génica/efectos de la radiación , Proteína Fosfatasa 2C/genética , Ratas , Proteínas Smad/genética , Proteínas Smad/metabolismo , Espectrometría de Masa por Ionización de ElectrosprayRESUMEN
Irinotecan (CPT-11) is used for therapy of various cancers. However, it has several serious adverse reactions such as diarrhea which is caused by SN-38, the active form of CPT-11. This study aimed to evaluate the effectiveness of Jiawei xianglian decoction (JWXLD), which has been widely used for the treatment of diarrhea in China. In this study, a mouse model with delayed diarrhea was generated by CPT-11. Real-time PCR and enzyme-linked immunosorbent assay (ELISA) were performed to explore intestinal microflora and inflammatory cytokine. Hematoxylin and eosin (H&E) staining was used to analyze tissue morphology. We found that 0.12, 0.23, and 0.46 g JWXLD significantly reduced the severity of CPT-11-induced diarrhea. The levels of Lactobacillus (Lacto) and Bifidobacterium (Bifid) were significantly downregulated by CPT-11, and these effects can be reversed by JWXLD treatment. Furthermore, JWXLD was observed to decrease the activity of ß-glucuronidase (ß-GD). Histopathological data showed that CPT-11 induced severe intestinal mucosal injury, which was characterized as grade 6, and JWXLD significantly alleviated the injury. In addition, CPT-11 increased the productions of tumor necrosis factor-alpha (TNF-α), tumor necrosis factor-beta (TNF-ß), interleukin-6 (IL-6), and interleukin-1 (IL-1), but decreased interleukin-15 (IL-15), interleukin-7 (IL-7), and uridine diphosphate-glucuronosyltransferase 1A1 (UGT1A1). In conclusion, JWXLD can counteract these effects caused by CPT-11 treatment. JWXLD could alleviate CPT-11-induced diarrhea.