Effects of different transdermal penetration enhancers applied to herbal cake-partitioned moxibustion on liver lipids,HSL and HMG-CoA reductase in hyperlipidemia rabbits

Objective:To observe the effects of laurocapram and borneol as transdermal penetration enhancers applied to herbal cake-partitioned moxibustion on liver lipids,hormone-sensitive lipase(HSL)and hydroxymethylglutaryl CoA(HMG-CoA)reductase in hyperlipidemia rabbits.Methods:Forty New-Zealand rabbits were randomly divided into 5 groups using the random number table method,with 8 rats in each group.Rabbits in the blank group were fed routinely with a normal diet;rabbits in the other groups were fed with high-fat diet for 12 weeks to establish the hyperlipidemia model.Rabbits in the blank and the model groups were not given any intervention.After the model was prepared successfully,rabbits in the non-transdermal penetration enhancer group received herbal cake-partitioned moxibustion without transdermal penetration enhancers;rabbits in the laurocapram group and the borneol group received herbal cake-partitioned moxibustion with laurocapram or borneol respectively.After 4 weeks of treatment,the serum was isolated and enzyme-linked immunosorbent assay(ELISA)was applied for the detection of HSL and HMG-CoA reductase.The liver tissues were isolated,and total cholesterol(TC)and triglycerides(TG)were measured by enzymatic methods.One-step method was applied for high-density lipoprotein cholesterol(HDL-C)and low-density lipoprotein cholesterol(LDL-C)detection,and transmission turbidimetry was for apolipoprotein A1(Apo-A1)and apolipoprotein B(Apo-B)detection.Results:The serum concentrations of the drugs in the laurocapram and the borneol groups were significantly higher than those in the non-transdermal penetration enhancer group(both P<0.05);all drug penetrations in the borneol group were significantly higher than those in the laurocapram group(both P<0.05),except for tanshinoneⅡA.Compared with the non-transdermal penetration enhancer group,the HSL was significantly increased while the HMG-CoA reductase was significantly decreased in the laurocapram and the borneol groups(both P<0.05);between groups,the HSL in the borneol group was significantly higher than that in the laurocapram group(P<0.05).Compared with the blank group,the levels of LDL-C,TG,TC and Apo-B in rabbit liver were significantly increased in the model group(P<0.05);compared with the model group,the levels of LDL-C,TG,TC and Apo-B in the non-transdermal penetration enhancer,the laurocapram,and the borneol groups were significantly decreased(all P<0.05);between groups,the TG and TC in the laurocapram group and the LDL-C,TG,TC and Apo-B in the borneol group were significantly lower than those in the non-transdermal penetration enhancer group(all P<0.05),and the TG,LDL-C and Apo-B in the borneol group were significantly lower than those in the laurocapram group(all P<0.05).Compared with the blank group,the HDL-C and Apo-A1 were significantly decreased in the model group(both P<0.05),while compared with the model group,the HDL-C and Apo-A1 were significantly increased in the non-transdermal penetration enhancer,the laurocapram,and the borneol groups(all P<0.05).Between groups,the Apo-A1 in the laurocapram group,the HDL-C and Apo-A1 in the borneol group were significantly higher than those in the non-transdermal penetration enhancer group(all P<0.05).Conclusion:The application of laurocapram and borneol,as transdermal penetration enhancers,in herbal cake-partitioned moxibustion can promote the penetration of the drugs in the herbal cake,increase the levels of HDL-C and Apo-A1,improve the metabolism of HSL and HMG-CoA reductase,and also simultaneously reduce the levels of TC,TG,LDL-C and Apo-B in the liver.The transdermal penetration enhancement effect of borneol is slightly better than or equivalent to that of laurocapram.