Key result
Danlou tablet treatment reversed the changes in lipid concentration, LPL activity, and atherosclerosis caused by chronic intermittent hypoxia in mice.
Why the study?
Danlou tablet is used for dyslipidemia and atherosclerosis, but whether it is effective against chronic intermittent hypoxia-induced vascular injury was unknown.
Does Danlou tablet alleviate vascular injury caused by chronic intermittent hypoxia in mice?
Does Danlou tablet alleviate vascular injury caused by chronic intermittent hypoxia in mice?
Danlou tablet improves vascular damage and lipid profiles induced by chronic intermittent hypoxia in mice, potentially via the FIH-1/HIF-1/Angptl4 pathway.
DLT attenuated CIH vascular injury in mice; leaves open translation to human sleep apnea therapy.
Background: Danlou tablet (DLT), the traditional Chinese medicine has been commonly used for dyslipidemia, atherosclerosis, and coronary heart disease. Whether it was effective against vascular injury caused by CIH has remained unknown. The aim of the current study was to observe the effects of DLT on chronic intermittent hypoxia (CIH)-induced vascular injury via regulation of blood lipids and to explore potential mechanisms. Methods: mice were randomly divided into four groups. The sham group was exposed to normal room air, whereas the other three groups were exposed to CIH. Mice in the CIH + normal saline (NS) group were gavaged with NS. Mice in the CIH + Angptl4-ab group were intraperitoneally injected with Angptl4-antibody. Mice in the CIH + DLT group were gavaged with DLT. After four weeks of intervention, serum lipid concentrations, and serum lipoprotein lipase (LPL) activity were detected. The changes in atherosclerosis in vascular tissue were detected by hematoxylin and eosin (H&E) staining. Quantitative real-time polymerase chain reaction (qRT-PCR) and Western blot analysis were applied to detect the expression levels of hypoxia-induciblefactor-1 (HIF-1), factor-inhibiting HIF-1 (FIH-1), angiopoietin-like 4 (Angptl4), and LPL in different tissues. Results: CIH exposure increases serum lipid levels, decreases serum LPL activity, and exacerbates atherosclerosis. Both Angptl4-ab and DLT treatment reversed the changes in lipid concentration, LPL activity, and atherosclerosis caused by CIH. In the epididymal fat pad, CIH exposure decreased the expression of FIH-1 and increased the expression of HIF-1, whereas DLT treatment increased the expression of FIH-1 and LPL and inhibited the expression of HIF-1 and Angptl4. In heart tissue, the expression levels of LPL and Angptl4 were not affected by modeling or treatment. Conclusions: DLT improved vascular damage by improving the increase in blood lipids induced by CIH, potentially by upregulating FIH-1 and downregulating HIF-1 and Angptl4 in adipose tissue. Therefore, DLT may be a promising agent for the prevention and treatment of CIH-induced vascular injury.
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Rong et al. (2022) studied Chronic intermittent hypoxia (CIH)-induced vascular injury. Danlou tablet (DLT) vs. Normal saline (NS) under CIH, and sham (normal room air) was evaluated on Serum lipid concentrations, serum LPL activity, and atherosclerosis changes. Danlou tablet treatment reversed the changes in lipid concentration, LPL activity, and atherosclerosis caused by chronic intermittent hypoxia in mice.
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