Effects of Acupoint Application Therapy with TianGui Powder on Osteoporosis in Ovariectomized Rats through TGF‐β1 and Smad2/3 Signaling Pathway

OBJECTIVES: To explore the effects of acupoint application therapy (AAT) with TianGui Powder (TGP) on the expressions of the transforming growth factor β1 (TGF‐β1) and Smad‐2/3 signaling pathway in ovariectomized osteoporosis rats. METHODS: Sixty rats were randomly divided into four groups: normal group (group A), model group (group B), TGP group (group C), and Western medicine group (group D). Group A had only the corresponding amount of adipose tissue around the ovary removed; rats in the other groups had bilateral ovariectomies. After 1 week, groups A and B were given 1 mL/100 mg normal saline solution by gavage, group C was treated with AAT with TGP on ShenQue acupoint (0.2 piece/rat, 6 h/time, 1 time/d) and group D was given calcium carbonate vitamin D3 (36 mg/kg/d) and alfacalcidol (0.05 μg/kg/d) tablet suspension. In this study, the bone mineral density (BMD) , the levels of BALP, TRAP‐5b, and BGP in serum and the changes in bone histomorphology was detected. For acquiring lumbar experimental data, the expression of TGF‐β1, Smad‐2/3 proteins and mRNA of TGF‐β1and Smad‐2/3 were assessed. After 12 weeks, the data were collected for analysis. RESULTS: Compared with group A, the bone trabecula was thinner and significantly reduced in other groups. The result of BMD improved significantly in both groups C and D compared to group B after intervention (P < 0.05). In contrast, compared to group B, the levels of BALP, TRAP‐5b, and BGP significantly declined in both groups C and D. In group C, the results of protein expressions in TGF‐β1, Smad‐2/3 were 2.870 ± 0.270, 1.552 ± 0.111, and 1.420 ± 0.079, respectively. In groups C and D, those indications significantly declined compared to group B (P < 0.01). In group C, the level of mRNA expressions of TGF‐β1, Smad‐2/3 were 1.872 ± 0.177, 1.672 ± 0.086, and 1.790 ± 0.136, respectively. Compared with group B, those indications had significant difference in groups C and D (P < 0.05). CONCLUSION: Acupoint application therapy with TGP could significantly improve the BMD. The TGF‐β1 and Smad‐2/3 signaling pathway could be a therapeutic target of TGP in postmenopausal osteoporosis rats.