Ethnopharmacological relevance: Traditional Chinese medicine Botrychium ternatum (Thunb.) Sw, also known as Sceptridium ternatum (STE) has the efficacy of relieving cough and asthma, resolving phlegm, and clearing heat and toxicity. However, the effects and mechanisms of STE on RIPF have not been reported.
Aim of the study: Radiation-induced pulmonary fibrosis (RIPF) leads to decreased survival and severely affects the quality of life of patients by irreversible destruction of lung tissue, and deterioration of lung function. In RIPF, excessive accumulation of extracellular matrix (ECM) destroys normal lung physiology.
Materials and methods: We established IR-induced RIPF model in rats, MRI showed the area of pulmonary fibrosis; we used HE staining and Masson staining to measure the damaged structure of alveoli; RESULTS: MRI showed STE significantly reduced the area of pulmonary fibrosis; HE staining and Masson staining also showed STE could improve the damaged structure of alveoli and reduce collagen and matrix deposition, significantly inhibiting RIPF; STE down-regulated the expression of α-SMA and suppress EMT. Cell Adhesion Factor CEACAM1 were significantly upregulated after IR induction and STE significantly reversed it, siRNA-CEACAM1 significantly inhibited EMT. STE and its monomeric phlorizin inhibited IR-induced EMT through regulating EGFR/p38-MAPK/NF-κB/CEACAM1 signaling pathway; CONCLUSION: Our study confirmed the significant therapeutic effect of STE on RIPF through in vivo and vitro experiments, and revealed that STE may exert anti-RIPF effect through regulating EGFR/p38-MAPK/NF-κB/CEACAM1 signaling pathway.
Ethnopharmacological relevance: Myocardial ischemia-reperfusion (I/R) injury stands as a significant contributor to cardiovascular disease. Shengmai-Yin (SMY), a traditional Chinese medicine, is widely used in myocardial infarct treatment. However, the specific mechanism of SMY in treating myocardial I/R injury is currently limited.
Aim of study: The study aimed to investigate the therapeutic efficacy of SMY in addressing myocardial I/R injury and elucidate its specific mechanisms.
Materials and methods: The active components of SMY were quantified using Ultra-high performance liquid chromatography-MS/MS (UPLC-MS/MS). Sprague-Dawley (SD) rats were treated with SMY post-I/R model establishment. Cardiac injury was assessed by heart weight to body weight ratio. Left ventricular function and infarct volume were evaluated using ultrasound cardiography and TTC staining. Tissue lesions were examined via hematoxylin-eosin (HE) and Sirius Red staining. Co-Immunoprecipitation (Co-IP) technology explored absent in melanoma 2 (AIM2) and K27 Ubiquitination Modification (K27-Ub) interactions. Immunofluorescence staining detected Apoptosis-associated Speck-like Protein containing a CARD (ASC) and AIM2 co-localization. Adeno-associated Virus (AAV) was used to upregulate AIM2 levels, while Shikonin was used to downregulate AIM2, to explore its roles in SMY's therapeutic effects on I/R injury.
Results: SMY can reduce infarct size and enhance cardiac function. Furthermore, SMY can inhibit tissue fibrosis. Fibrosis markers and proinflammatory factors were reduced after SMY treatment. Serum levels of Lactate Dehydrogenase (LDH) and Creatine Kinase -MB (CK-MB) were also decreased. Mechanistically, SMY inhibits the activation of the AIM2 inflammasome by downregulating the K27 ubiquitination of AIM2. Overexpression of AIM2 reversed the anti-I/R effect of SMY, suggesting that AIM2 plays a crucial role in I/R injury. The AIM2 inhibitor counteracts the therapeutic effect of SMY.
Conclusion: SMY inhibits the K27 ubiquitination modification of AIM2 and inhibits the activation of AIM2 inflammasomes after myocardial I/R injury.