White Tea Reduced Bone Loss by Suppressing the TRAP/CTX Pathway in Ovariectomy-Induced Osteoporosis Model Rats

Abstract

Osteoporosis is an important skeletal disease characterized by bone weakness and high risk of fracture in postmenopausal women. Tea consumption is known to play an important role in the prevention or alleviation of osteoporosis. However, the therapeutic effects of aqueous extracts of white tea (WT) have not been evaluated in osteoporosis rat models. The aim of this study was to investigate the potential anti-osteoporotic role of WT in ovariectomized (OVX) rats. WT was given orally at 0.5% w/v doses for 12 weeks in OVX rats. Biochemical parameters in blood samples, bone tartrate-resistant acid phosphatase (TRAP), C-terminal telopeptide of type 1 collagen (CTX) and estradiol levels were evaluated. Bone mineral density and bone mineral content values were measured in the left femur. In addition to histopathological examination, osteolcalcin, osteopontin and TU-NEL levels were determined. OVX group data demonstrated that bone loss occurred by thinning of the metaphyseal growth plates of the femur. Similarly, the levels of TRAP and CTX, markers of osteoclastic activity, were found to be high concurrently with a decrease in femoral bone mineral density. In addition, increased osteolcalcin and osteopontin levels were present in the metaphyseal growth zones. On the other hand, while TRAP and CTX levels were suppressed in the OVX-WT group, bone mineral content increased. In addition, TUNEL, osteocalcin and osteopontin positivity decreased in the right femoral metaphysis growth zones, proliferating zone and resting zone cells. These results showed that chronic WT consumption has a protective effect by reducing bone resorption in OVX-induced osteoporotic rats.

GC–MS and LC-TOF–MS profiles, toxicity, and macrophage-dependent in vitro anti-osteoporosis activity of Prunus africana (Hook f.) Kalkman Bark

“…Therefore, as a measure of osteoclast number and bone resorption, TRAP plays a vital role in osteoporosis diagnosis and prognosis 23 . And as evidenced in the previous study, the suppressing of TRAP pathway prevented ovariectomy-induced osteoporosis in vivo 26 . Therefore, the significant ( p < 0.001) inhibition compared to the control at concentrations of 6.25, 12.5, 25, and 50 µg/ml methanolic P. africana stem bark extracts is an indication of P. africana anti-osteoporosis effects.…”

A Novel Peptide, CK2.3, Improved Bone Formation in Ovariectomized Sprague Dawley Rats

“…In our study, OVX rats had about 20% decreased BMD in the femur compared to SHAM rats at week 4-16 post OVX. Other researchers have also reported similar loss of femoral BMD (about 20% loss at week 4-20 post OVX) in their OVX rat model [ 47 , 48 , 49 , 50 , 51 ]. Therefore, we did not investigate the atrophy of the uterus to confirm the successful rate of the OVX surgery.…”

Potential mechanism of tea for treating osteoporosis, osteoarthritis, and rheumatoid arthritis

“…Furthermore, it can increase the production of bone formation markers and improve bone turnover rates (12). In particular, the intake of active ingredients such as tea water extracts and tea polyphenols leads to significant improvements in bone mineral density, microstructure deterioration, and biological properties in ovariectomized or orchiectomized rats (32)(33)(34)(35).…”