Vol 61, No 1 (2023)
Original paper
Published online: 2023-03-06
HDAC6 inhibition alleviates acute pulmonary embolism: a possible future therapeutic option
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Abstract
Introduction. Acute pulmonary embolism (APE) is a clinical syndrome of pulmonary circulation disorder caused by obstruction of the pulmonary artery or its branches. Histone deacetylase 6 (HDAC6) has been reported to play an important role in lung-related diseases. However, the functional role of HDAC6 in APE remains unclear.
Material and methods. Male Sprague Dawley rats were used. The APE model was constructed by inserting an intravenous cannula into the right femoral vein and injecting Sephadex G-50 microspheres (12 mg/kg; 300 μm in diameter). After 1 h, the control and APE rats were intraperitoneally injected with tubastatin A (TubA) (40 mg/kg, an inhibitor of HDAC6) and sampled at 24 h after modeling. H&E staining, arterial blood gas analysis, and wet/dry (W/D) weight ratio were used to evaluate the histopathological changes and pulmonary function in APE rats. ELISA, Western blot, and immunohistochemistry were used to explore the potential mechanism of HDAC6-mediated inflammation in APE.
Results. The results indicated that HDAC6 expression was significantly increased in lungs of APE rats. TubA treatment in vivo decreased HDAC6 expression in lung tissues. HDAC6 inhibition alleviated histopathological damage and pulmonary dysfunction, as evidenced by decreased PaO2/FiO2 ratio and W/D weight ratio in APE rats. Furthermore, HDAC6 inhibition alleviated APE-induced inflammatory response. Specifically, APE rats exhibited increased production of pro-inflammatory cytokines, including tumor necrosis factor-alpha (TNF-α), interleukin (IL)-1β, IL-6, and IL-18, however, this increase was reversed by HDAC6 inhibition. Meanwhile, the activation of the NLRP3 inflammasome was also observed in lungs of APE rats, while HDAC6 inhibition blocked this activation. Mechanically, we demonstrated that HDAC6 inhibition blocked the activation of the protein kinase B (AKT)/extracellular signal-regulated protein kinase (ERK) signaling pathway, a classic pathway promoting inflammation.
Conclusions. These findings demonstrate that the inhibition of HDAC6 may alleviate lung dysfunction and pathological injury resulting from APE by blocking the AKT/ERK signaling pathway, providing new theoretical fundamentals for APE therapy.
Keywords: ratacute pulmonary embolismlung injuryhistone deacetylase 6 inhibitiontubastatin AAKT/ERK pathway
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