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Wen X, Wu P, Li F, Pi G. Study on the relationship between tea polyphenols alleviating osteoporosis and the changes of microorganism-metabolite-intestinal barrier. Microb Pathog 2024; 188:106564. [PMID: 38307369 DOI: 10.1016/j.micpath.2024.106564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2023] [Revised: 01/29/2024] [Accepted: 01/31/2024] [Indexed: 02/04/2024]
Abstract
Tea polyphenols are known to alleviate osteoporosis; however, the role of intestinal flora in this process has not been studied. This research employed 16s rRNA sequencing and non-targeted metabonomics to investigate the potential link between osteoporosis mitigation and changes in intestinal flora. MicroCT and tissue staining results demonstrated that tea polyphenols improved bone microstructure, modulated bone metabolism, and significantly alleviated osteoporosis. The administration of tea polyphenols led to alterations in the intestinal flora's composition, marked by increased abundance of Firmicutes and Lactobacillus and decreased prevalence of Bacteroidetes and Bacteroides. Concurrently, the levels of serum metabolites such as Spermidine and 5,6-Dihydrouracil, associated with intestinal microorganisms, underwent significant changes. These variations in intestinal flora and metabolites are closely linked to bone metabolism. Furthermore, tea polyphenols partially repaired intestinal barrier damage, potentially due to shifts in intestinal flora and their metabolites. Overall, our findings suggest that tea polyphenol intervention modifies the intestinal flora and serum metabolites in osteoporotic mice, which could contribute to the repair of intestinal barrier damage and thereby mitigate osteoporosis. This discovery aids in elucidating the mechanism behind tea polyphenols' osteoporosis-relieving effects.
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Affiliation(s)
- Xin Wen
- Department of Orthopedics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China.
| | - Panyang Wu
- Department of Orthopedics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China.
| | - Feng Li
- Department of Orthopedics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China.
| | - Guofu Pi
- Department of Orthopedics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China.
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Huang HT, Cheng TL, Lin SY, Ho CJ, Chyu JY, Yang RS, Chen CH, Shen CL. Osteoprotective Roles of Green Tea Catechins. Antioxidants (Basel) 2020; 9:E1136. [PMID: 33207822 PMCID: PMC7696448 DOI: 10.3390/antiox9111136] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2020] [Revised: 11/08/2020] [Accepted: 11/12/2020] [Indexed: 02/07/2023] Open
Abstract
Osteoporosis is the second most common disease only secondary to cardiovascular disease, with the risk of fracture increasing with age. Osteoporosis is caused by an imbalance between osteoblastogenesis and osteoclastogenesis processes. Osteoclastogenesis may be enhanced, osteoblastogenesis may be reduced, or both may be evident. Inflammation and high reactive oxygen enhance osteoclastogenesis while reducing osteoblastogenesis by inducing osteoblast apoptosis and suppressing osteoblastic proliferation and differentiation. Catechins, the main polyphenols found in green tea with potent anti-oxidant and anti-inflammatory properties, can counteract the deleterious effects of the imbalance of osteoblastogenesis and osteoclastogenesis caused by osteoporosis. Green tea catechins can attenuate osteoclastogenesis by enhancing apoptosis of osteoclasts, hampering osteoclastogenesis, and prohibiting bone resorption in vitro. Catechin effects can be directly exerted on pre-osteoclasts/osteoclasts or indirectly exerted via the modulation of mesenchymal stem cells (MSCs)/stromal cell regulation of pre-osteoclasts through activation of the nuclear factor kB (RANK)/RANK ligand (RANKL)/osteoprotegerin (OPG) system. Catechins also can enhance osteoblastogenesis by enhancing osteogenic differentiation of MSCs and increasing osteoblastic survival, proliferation, differentiation, and mineralization. The in vitro effects of catechins on osteogenesis have been confirmed in several animal models, as well as in epidemiological observational studies on human subjects. Even though randomized control trials have not shown that catechins provide anti-fracture efficacy, safety data in the trials are promising. A large-scale, placebo-controlled, long-term randomized trial with a tea regimen intervention of optimal duration is required to determine anti-fracture efficacy.
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Affiliation(s)
- Hsuan-Ti Huang
- Orthopaedic Research Center, Kaohsiung Medical University, Kaohsiung 80701, Taiwan; (H.-T.H.); (T.-L.C.); (S.-Y.L.); (C.-J.H.)
- Department of Orthopedics, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung 80701, Taiwan
- Departments of Orthopedics, College of Medicine, Kaohsiung Medical University, Kaohsiung 80701, Taiwan
- Department of Orthopedics, Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung 80145, Taiwan
- Regeneration Medicine and Cell Therapy Research Center, Kaohsiung Medical University, Kaohsiung 80701, Taiwan
| | - Tsung-Lin Cheng
- Orthopaedic Research Center, Kaohsiung Medical University, Kaohsiung 80701, Taiwan; (H.-T.H.); (T.-L.C.); (S.-Y.L.); (C.-J.H.)
- Regeneration Medicine and Cell Therapy Research Center, Kaohsiung Medical University, Kaohsiung 80701, Taiwan
- Department of Physiology, College of Medicine, Kaohsiung Medical University, Kaohsiung 80701, Taiwan
| | - Sung-Yen Lin
- Orthopaedic Research Center, Kaohsiung Medical University, Kaohsiung 80701, Taiwan; (H.-T.H.); (T.-L.C.); (S.-Y.L.); (C.-J.H.)
- Department of Orthopedics, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung 80701, Taiwan
- Departments of Orthopedics, College of Medicine, Kaohsiung Medical University, Kaohsiung 80701, Taiwan
- Department of Orthopedics, Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung 80145, Taiwan
| | - Cheng-Jung Ho
- Orthopaedic Research Center, Kaohsiung Medical University, Kaohsiung 80701, Taiwan; (H.-T.H.); (T.-L.C.); (S.-Y.L.); (C.-J.H.)
- Department of Orthopedics, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung 80701, Taiwan
- Departments of Orthopedics, College of Medicine, Kaohsiung Medical University, Kaohsiung 80701, Taiwan
| | - Joanna Y. Chyu
- School of Medicine, University of Texas Medical Branch, Galveston, TX 77555, USA;
| | - Rong-Sen Yang
- Department of Orthopedics, National Taiwan University Hospital, Taipei 100229, Taiwan;
| | - Chung-Hwan Chen
- Orthopaedic Research Center, Kaohsiung Medical University, Kaohsiung 80701, Taiwan; (H.-T.H.); (T.-L.C.); (S.-Y.L.); (C.-J.H.)
- Department of Orthopedics, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung 80701, Taiwan
- Departments of Orthopedics, College of Medicine, Kaohsiung Medical University, Kaohsiung 80701, Taiwan
- Department of Orthopedics, Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung 80145, Taiwan
- Regeneration Medicine and Cell Therapy Research Center, Kaohsiung Medical University, Kaohsiung 80701, Taiwan
- Institute of Medical Science and Technology, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan
- Department of Healthcare Administration and Medical Informatics, Kaohsiung Medical University, Kaohsiung 80701, Taiwan
| | - Chwan-Li Shen
- Department of Pathology, Texas Tech University Health Sciences Center, Lubbock, TX 79430, USA
- Center of Excellence for Integrative Health, Texas Tech University Health Sciences Center, Lubbock, TX 79430, USA
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Lin SY, Kang L, Wang CZ, Huang HH, Cheng TL, Huang HT, Lee MJ, Lin YS, Ho ML, Wang GJ, Chen CH. (-)-Epigallocatechin-3-Gallate (EGCG) Enhances Osteogenic Differentiation of Human Bone Marrow Mesenchymal Stem Cells. Molecules 2018; 23:E3221. [PMID: 30563251 PMCID: PMC6321548 DOI: 10.3390/molecules23123221] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2018] [Revised: 11/08/2018] [Accepted: 11/14/2018] [Indexed: 01/08/2023] Open
Abstract
Osteoporosis is the second most-prevalent epidemiologic disease in the aging population worldwide. Cross-sectional and retrospective evidence indicates that tea consumption can mitigate bone loss and reduce risk of osteoporotic fractures. Tea polyphenols enhance osteoblastogenesis and suppress osteoclastogenesis in vitro. Previously, we showed that (-)-epigallocatechin-3-gallate (EGCG), one of the green tea polyphenols, increased osteogenic differentiation of murine bone marrow mesenchymal stem cells (BMSCs) by increasing the mRNA expression of osteogenesis-related genes, alkaline phosphatase activity and, eventually, mineralization. We also found that EGCG could mitigate bone loss and improve bone microarchitecture in ovariectomy-induced osteopenic rats, as well as enhancing bone defect healing partially via bone morphogenetic protein 2 (BMP2). The present study investigated the effects of EGCG in human BMSCs. We found that EGCG, at concentrations of both 1 and 10 µmol/L, can increase mRNA expression of BMP2, Runx2, alkaline phosphatase (ALP), osteonectin and osteocalcin 48 h after treatment. EGCG increased ALP activity both 7 and 14 days after treatment. Furthermore, EGCG can also enhance mineralization two weeks after treatment. EGCG without antioxidants also can enhance mineralization. In conclusion, EGCG can increase mRNA expression of BMP2 and subsequent osteogenic-related genes including Runx2, ALP, osteonectin and osteocalcin. EGCG further increased ALP activity and mineralization. Loss of antioxidant activity can still enhance mineralization of human BMSCs (hBMSCs).
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Affiliation(s)
- Sung-Yen Lin
- Orthopaedic Research Center, Kaohsiung Medical University, Kaohsiung 80701, Taiwan.
- Department of Orthopedics, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung 80701, Taiwan.
- Departments of Orthopedics, College of Medicine, Kaohsiung Medical University, Kaohsiung 80701, Taiwan.
- Department of Orthopedics, Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung 80415, Taiwan.
- Graduate Institute of Medicine, Kaohsiung Medical University, Kaohsiung 80701, Taiwan.
| | - Lin Kang
- Department of Obstetrics and Gynecology, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan 70403, Taiwan.
| | - Chau-Zen Wang
- Orthopaedic Research Center, Kaohsiung Medical University, Kaohsiung 80701, Taiwan.
- Graduate Institute of Medicine, Kaohsiung Medical University, Kaohsiung 80701, Taiwan.
- Department of Physiology, College of Medicine, Kaohsiung Medical University, Kaohsiung 80701, Taiwan.
- Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung 80701, Taiwan.
| | - Han Hsiang Huang
- Department of Veterinary Medicine, National Chiayi University, Chiayi 60054, Taiwan.
| | - Tsung-Lin Cheng
- Orthopaedic Research Center, Kaohsiung Medical University, Kaohsiung 80701, Taiwan.
- Department of Physiology, College of Medicine, Kaohsiung Medical University, Kaohsiung 80701, Taiwan.
| | - Hsuan-Ti Huang
- Orthopaedic Research Center, Kaohsiung Medical University, Kaohsiung 80701, Taiwan.
- Department of Orthopedics, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung 80701, Taiwan.
- Departments of Orthopedics, College of Medicine, Kaohsiung Medical University, Kaohsiung 80701, Taiwan.
- Department of Orthopedics, Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung 80415, Taiwan.
| | - Mon-Juan Lee
- Department of Bioscience Technology, Chang Jung Christian University, Tainan 71101, Taiwan.
- Innovative Research Center of Medicine, Chang Jung Christian University, Tainan 71101, Taiwan.
| | - Yi-Shan Lin
- Orthopaedic Research Center, Kaohsiung Medical University, Kaohsiung 80701, Taiwan.
| | - Mei-Ling Ho
- Orthopaedic Research Center, Kaohsiung Medical University, Kaohsiung 80701, Taiwan.
- Department of Physiology, College of Medicine, Kaohsiung Medical University, Kaohsiung 80701, Taiwan.
- Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung 80701, Taiwan.
- Department of Marine Biotechnology and Resources, National Sun Yat-sen University, Kaohsiung 80424, Taiwan.
| | - Gwo-Jaw Wang
- Orthopaedic Research Center, Kaohsiung Medical University, Kaohsiung 80701, Taiwan.
- Department of Orthopedics, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung 80701, Taiwan.
| | - Chung-Hwan Chen
- Orthopaedic Research Center, Kaohsiung Medical University, Kaohsiung 80701, Taiwan.
- Department of Orthopedics, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung 80701, Taiwan.
- Departments of Orthopedics, College of Medicine, Kaohsiung Medical University, Kaohsiung 80701, Taiwan.
- Department of Orthopedics, Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung 80415, Taiwan.
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Liu Q, Zhou Y, Li Z. PDGF‑BB promotes the differentiation and proliferation of MC3T3‑E1 cells through the Src/JAK2 signaling pathway. Mol Med Rep 2018; 18:3719-3726. [PMID: 30106097 PMCID: PMC6131220 DOI: 10.3892/mmr.2018.9351] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Accepted: 07/20/2018] [Indexed: 11/20/2022] Open
Abstract
Platelet-derived growth factor-BB (PDGF-BB) serves a critical function in human osteoblast differentiation and proliferation. Src and Janus kinase 2 (JAK2) are involved in these processes. In our previous study, it was identified that Src could promote the phosphorylation of JAK2. However, it has yet to be determined whether the Src/JAK2 signaling pathway affects PDGF-BB-mediated osteoblast differentiation and proliferation. In the present study, western blotting, polymerase chain reaction, alizarin red staining, alkaline phosphatase and Cell Counting kit-8 were employed to explore these questions. Firstly, it was demonstrated that PDGF-BB activates the Src/JAK2 signaling pathway in MC3T3-E1 cells in a time-dependent manner. Furthermore, it was demonstrated that PDGF-BB expression promoted MC3T3-E1 cell differentiation and proliferation; this process was suppressed by AG1295, SU6656 and AG490, which are inhibitors of PDGFR-β, Src and JAK2, respectively. SU6656 downregulated the activity of Src and JAK2, while AG490 only downregulated JAK2 activity. Therefore, it was concluded that Src is upstream of JAK2. PDGF-BB also upregulated the expression of osteogenesis-associated genes, and the formation of mineral nodules. However, these effects were markedly inhibited by treatment with SU6656. This indicated that PDGF-BB promoted MC3T3-E1 cell differentiation and proliferation by activating the Src/JAK2 signaling pathway. These results suggested that PDGF-BB may have potential applications in the treatment of osteoporosis and bone fractures.
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Affiliation(s)
- Qi Liu
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei‑MOST) and Key Laboratory of Oral Biomedicine Ministry of Education, Wuhan University, Wuhan, Hubei 430079, P.R. China
| | - Yunfeng Zhou
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei‑MOST) and Key Laboratory of Oral Biomedicine Ministry of Education, Wuhan University, Wuhan, Hubei 430079, P.R. China
| | - Zubing Li
- Department of Oral and Maxillofacial Surgery, School and Hospital of Stomatology, Wuhan University, Wuhan, Hubei 430079, P.R. China
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Torre E. Molecular signaling mechanisms behind polyphenol-induced bone anabolism. PHYTOCHEMISTRY REVIEWS : PROCEEDINGS OF THE PHYTOCHEMICAL SOCIETY OF EUROPE 2017; 16:1183-1226. [PMID: 29200988 PMCID: PMC5696504 DOI: 10.1007/s11101-017-9529-x] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Accepted: 08/20/2017] [Indexed: 05/08/2023]
Abstract
For millennia, in the different cultures all over the world, plants have been extensively used as a source of therapeutic agents with wide-ranging medicinal applications, thus becoming part of a rational clinical and pharmacological investigation over the years. As bioactive molecules, plant-derived polyphenols have been demonstrated to exert many effects on human health by acting on different biological systems, thus their therapeutic potential would represent a novel approach on which natural product-based drug discovery and development could be based in the future. Many reports have provided evidence for the benefits derived from the dietary supplementation of polyphenols in the prevention and treatment of osteoporosis. Polyphenols are able to protect the bone, thanks to their antioxidant properties, as well as their anti-inflammatory actions by involving diverse signaling pathways, thus leading to bone anabolic effects and decreased bone resorption. This review is meant to summarize the research works performed so far, by elucidating the molecular mechanisms of action of polyphenols in a bone regeneration context, aiming at a better understanding of a possible application in the development of medical devices for bone tissue regeneration.
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Affiliation(s)
- Elisa Torre
- Nobil Bio Ricerche srl, Via Valcastellana, 26, 14037 Portacomaro, AT Italy
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Sakai G, Otsuka T, Fujita K, Kainuma S, Kuroyanagi G, Kawabata T, Matsushima-Nishiwaki R, Kozawa O, Tokuda H. Amplification by (−)-epigallocatechin gallate of prostaglandin F2α-stimulated synthesis of osteoprotegerin in osteoblasts. Mol Med Rep 2017; 16:6376-6381. [DOI: 10.3892/mmr.2017.7354] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Accepted: 08/16/2017] [Indexed: 11/06/2022] Open
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Alghadir AH, Gabr SA, Al-Eisa ES. Green tea and exercise interventions as nondrug remedies in geriatric patients with rheumatoid arthritis. J Phys Ther Sci 2016; 28:2820-2829. [PMID: 27821943 PMCID: PMC5088134 DOI: 10.1589/jpts.28.2820] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Accepted: 06/16/2016] [Indexed: 12/13/2022] Open
Abstract
This study aimed to evaluate the effects of green tea and supervised exercise training
interventions on improvement of disease activity and bone metabolism markers in rheumatoid
arthritis patients. [Subjects and Methods] One-hundred and twenty subjects who had a mean
age of (60.7 ± 2.53 years) and had been diagnosed with rheumatoid arthritis at least ten
years previously were randomly included in this study. Patients were treated with
infliximab, green tea, or a supervised exercise program for six months. Disease activity
markers as well as antioxidant activity of green tea extracts were estimated before
supplementation using in vitro assays. [Results] Rheumatoid arthritis patients treated
with green tea for 6 months alone or in combination with infliximab or an exercise program
showed significant improvement in disease activity parameters, including C-reactive
protein, and erythrocyte sedimentation rate, swollen and tender joints counts, and
modified Stanford Health Assessment Questionnaire score, along with an increase in serum
levels of bone resorption markers, i.e., deoxypyridinoline, amino-terminal telopeptide of
type 1 collagen, and bone alkaline phosphatase, at 6 months of after initial treatment.
The European League Against Rheumatism and American College of Rheumatology scores
revealed more clinical improvement in the disease activity of rheumatoid arthritis
patients treated with green tea along with exercise compared with rheumatoid arthritis
patients treated with infliximab or exercise combinations. This may have been due to the
higher potential antioxidant activity of green tea (89.6% to 96.5%). [Conclusion] Both
exercise and green tea interventions appeared to be beneficial as nondrug modulates for
rheumatoid arthritis disorders.
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Affiliation(s)
- Ahmad H Alghadir
- Rehabilitation Research Chair, College of Applied Medical Sciences, King Saud University: Riyadh 11433, Saudi Arabia
| | - Sami A Gabr
- Rehabilitation Research Chair, College of Applied Medical Sciences, King Saud University: Riyadh 11433, Saudi Arabia; Department of Anatomy, Faculty of Medicine, Mansoura University, Egypt
| | - Einas S Al-Eisa
- Rehabilitation Research Chair, College of Applied Medical Sciences, King Saud University: Riyadh 11433, Saudi Arabia
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Paulis G, Barletta D, Turchi P, Vitarelli A, Dachille G, Fabiani A, Gennaro R. Efficacy and safety evaluation of pentoxifylline associated with other antioxidants in medical treatment of Peyronie's disease: a case-control study. Res Rep Urol 2015; 8:1-10. [PMID: 26770906 PMCID: PMC4706125 DOI: 10.2147/rru.s97194] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Peyronie's disease (PD) is a chronic disorder involving the tunica albuginea surrounding the corpora cavernosa of the penis. A conservative treatment is indicated in the first stage of disease. The aim of this study was to assess the therapeutic impact and possible side effects of treatment with pentoxifylline (PTX) in combination with other antioxidants in 307 patients with early-stage PD. Patients were subdivided into three groups: A, B, and C. Both groups, A and B, comprising of 206 patients, underwent treatment, whereas Group C was the control group (n=101). Treatment lasted 6 months and included the following: Group A: PTX 400 mg twice a day + propolis 600 mg/d + blueberry 160 mg/d + vitamin E 600 mg/d + diclofenac 4% gel twice/a day + PTX 100 mg via perilesional penile injection/every other week (12 injections in all); Group B: the same treatment as Group A except for the penile PTX injections. After the 6-month treatment course, we obtained the following results: actual mean decrease in plaque volume -46.9% and -24.8% in Group A and B, respectively (P<0.0001); mean curvature reduction -10.1° and -4.8°, respectively (P,0.0001); resolution of pain in 67.6% and 67.2% of cases, respectively (P=0.961); recovery of normal penile rigidity in 56.09% and 23.5% of cases, respectively (P=0.005). After 6 months, progression of disease was observed in all patients belonging to Group C: plaque volume +123.3%; curvature +15.7°; no recovery of penile rigidity. The statistically significant results of our study show that multimodal treatment with PTX in association with other antioxidants and topical diclofenac is efficacious in treating early-stage PD. Furthermore, treatment proved to be more effective when PTX was administered both orally and by penile injection. No serious adverse effects occurred.
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Affiliation(s)
- Gianni Paulis
- Regina Apostolorum Hospital, Andrology Center, Albano L, Italy
- Castelfidardo Medical Team, Peyronie’s Disease Care Center, Rome, Italy
| | - Davide Barletta
- Department of Urology, Andrology Center, San Matteo Hospital, Pavia, Italy
| | - Paolo Turchi
- Azienda ASL 4 Prato – Andrology Service, Prato, Italy
| | | | | | - Andrea Fabiani
- Department of Surgery, Section of Urology and Andrology, Macerata, Italy
| | - Romano Gennaro
- Department of Urologic Oncology, Section of Avellino, Italian League Against Cancer, Avellino, Italy
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Application of Green Tea Catechin for Inducing the Osteogenic Differentiation of Human Dedifferentiated Fat Cells in Vitro. Int J Mol Sci 2015; 16:27988-8000. [PMID: 26602917 PMCID: PMC4691028 DOI: 10.3390/ijms161226081] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2015] [Revised: 11/16/2015] [Accepted: 11/18/2015] [Indexed: 12/21/2022] Open
Abstract
Despite advances in stem cell biology, there are few effective techniques to promote the osteogenic differentiation of human primary dedifferentiated fat (DFAT) cells. We attempted to investigate whether epigallocatechin-3-gallate (EGCG), the main component of green tea catechin, facilitates early osteogenic differentiation and mineralization on DFAT cells in vitro. DFAT cells were treated with EGCG (1.25-10 μM) in osteogenic medium (OM) with or without 100 nM dexamethasone (Dex) for 12 days (hereafter two osteogenic media were designated as OM(Dex) and OM). Supplementation of 1.25 μM EGCG to both the media effectively increased the mRNA expression of collagen 1 (COL1A1) and runt-related transcription factor 2 (RUNX2) and also increased proliferation and mineralization. Compared to OM(Dex) with EGCG, OM with EGCG induced earlier expression for COL1A1 and RUNX2 at day 1 and higher mineralization level at day 12. OM(Dex) with 10 μM EGCG remarkably hampered the proliferation of the DFAT cells. These results suggest that OM(without Dex) with EGCG might be a preferable medium to promote proliferation and to induce osteoblast differentiation of DFAT cells. Our findings provide an insight for the combinatory use of EGCG and DFAT cells for bone regeneration and stem cell-based therapy.
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Yamamoto N, Tokuda H, Kuroyanagi G, Kainuma S, Ohguchi R, Fujita K, Matsushima-Nishiwaki R, Kozawa O, Otsuka T. Amplification by (-)-epigallocatechin gallate and chlorogenic acid of TNF-α-stimulated interleukin-6 synthesis in osteoblasts. Int J Mol Med 2015; 36:1707-12. [PMID: 26496857 DOI: 10.3892/ijmm.2015.2381] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Accepted: 10/14/2015] [Indexed: 11/05/2022] Open
Abstract
Polyphenolic compounds in foods and beverages have beneficial effects on human health. (-)-Epigallocatechin gallate (EGCG) and chlorogenic acid (CGA), a major flavonoid in green tea and a major phenolic acid in coffee, respectively, have potent properties, including antioxidative effects. Our previous study demonstrated that p70 S6 kinase acts as a negative regulator in tumor necrosis factor-α (TNF-α)-stimulated interleukin-6 synthesis in osteoblast-like MC3T3-E1 cells. In the present study, the effects of EGCG and CGA on the TNF-α-stimulated interleukin‑6 synthesis were investigated in MC3T3‑E1 cells. EGCG and CGA significantly enhanced TNF-α-stimulated interleukin-6 release. In addition, the interleukin-6 mRNA expression levels induced by TNF‑α were supported by EGCG, as well as CGA. EGCG markedly attenuated the TNF-α-induced phosphorylation of p70 S6 kinase whereas CGA failed to affect the phosphorylation. These results strongly suggest that EGCG and CGA enhance the TNF-α-stimulated interleukin-6 synthesis in osteoblasts, and that the amplifying effect of EGCG, but not CGA, is exerted via inhibiting p70 S6 kinase.
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Affiliation(s)
- Naohiro Yamamoto
- Department of Orthopedic Surgery, Nagoya City University Graduate School of Medical Sciences, Nagoya 467‑8601, Japan
| | - Haruhiko Tokuda
- Department of Pharmacology, Gifu University Graduate School of Medicine, Gifu 501‑1194, Japan
| | - Gen Kuroyanagi
- Department of Orthopedic Surgery, Nagoya City University Graduate School of Medical Sciences, Nagoya 467‑8601, Japan
| | - Shingo Kainuma
- Department of Orthopedic Surgery, Nagoya City University Graduate School of Medical Sciences, Nagoya 467‑8601, Japan
| | - Reou Ohguchi
- Department of Orthopedic Surgery, Nagoya City University Graduate School of Medical Sciences, Nagoya 467‑8601, Japan
| | - Kazuhiko Fujita
- Department of Orthopedic Surgery, Nagoya City University Graduate School of Medical Sciences, Nagoya 467‑8601, Japan
| | | | - Osamu Kozawa
- Department of Pharmacology, Gifu University Graduate School of Medicine, Gifu 501‑1194, Japan
| | - Takanobu Otsuka
- Department of Orthopedic Surgery, Nagoya City University Graduate School of Medical Sciences, Nagoya 467‑8601, Japan
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Gennaro G, Claudino M, Cestari TM, Ceolin D, Germino P, Garlet GP, de Assis GF. Green Tea Modulates Cytokine Expression in the Periodontium and Attenuates Alveolar Bone Resorption in Type 1 Diabetic Rats. PLoS One 2015; 10:e0134784. [PMID: 26270535 PMCID: PMC4535908 DOI: 10.1371/journal.pone.0134784] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2014] [Accepted: 07/14/2015] [Indexed: 12/13/2022] Open
Abstract
UNLABELLED Diabetes mellitus comprises a heterogeneous group of disorders with the main feature of hyperglycemia. Chronic hyperglycemia increases the severity of periodontal disease via an exacerbated inflammatory response, activated by advanced glycation end products and their receptor, RAGE. Therefore, anti-inflammatory agents represent potential inhibitors of this pathological interaction. In particular, green tea has been shown to possess anti-inflammatory properties mediated by its polyphenol content. OBJECTIVES This study investigated the mechanisms by which green tea attenuates the spontaneous onset of diabetes-induced periodontitis. METHODS Diabetes was induced in rats via a single intraperitoneal injection of streptozotocin (STZ). Diabetic and control animals were divided into water-treated and green tea-treated subgroups and were analyzed at 15, 30, 60 and 90 days after diabetes induction. Immunohistochemistry was performed to quantitatively evaluate tumor necrosis factor-α (TNF-α), receptor activator of nuclear factor kappa-B ligand (RANKL), osteoprotegerin (OPG), interleukin-10 (IL-10) and runt-related transcription factor 2 (RUNX-2) expression in serial sections of each hemimaxilla. Morphometric measurements of the distance from the cementum-enamel junction (CEJ) of the superior distal root of the first molar to the alveolar bone crest (ABC) were performed to assess bone loss. RESULTS Diabetes resulted in significant bone loss and alterations in the number of cells that stained positive for inflammatory mediators. In the diabetic rats treated with green tea, we observed a decreased number of cells expressing RANKL and TNF-α compared with that observed in the diabetic rats treated with water. Additionally, green tea increased the numbers of cells that stained positive for OPG, RUNX-2 and IL-10 in the diabetic rats. CONCLUSION Green tea intake reduces expression of the pro-inflammatory cytokine TNF-α and the osteoclastogenic mediator RANKL to normal levels while increasing expression of the anti-inflammatory cytokine IL-10, the osteogenesis-related factor RUNX-2 and the anti-osteoclastogenic factor OPG. Therefore, green tea represents a potential therapeutic agent for the treatment of diabetes-related periodontal disease.
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Affiliation(s)
- Gabriela Gennaro
- Department of Biological Sciences, School of Dentistry of Bauru, São Paulo University, Bauru, São Paulo, Brazil
- * E-mail:
| | - Marcela Claudino
- Department of Biological Sciences, School of Dentistry of Bauru, São Paulo University, Bauru, São Paulo, Brazil
| | - Tania Mary Cestari
- Department of Biological Sciences, School of Dentistry of Bauru, São Paulo University, Bauru, São Paulo, Brazil
| | - Daniele Ceolin
- Department of Biological Sciences, School of Dentistry of Bauru, São Paulo University, Bauru, São Paulo, Brazil
| | - Patrícia Germino
- Department of Biological Sciences, School of Dentistry of Bauru, São Paulo University, Bauru, São Paulo, Brazil
| | - Gustavo Pompermaier Garlet
- Department of Biological Sciences, School of Dentistry of Bauru, São Paulo University, Bauru, São Paulo, Brazil
| | - Gerson Francisco de Assis
- Department of Biological Sciences, School of Dentistry of Bauru, São Paulo University, Bauru, São Paulo, Brazil
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12
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Zink A, Traidl-Hoffmann C. Grüner Tee in der Dermatologie - Mythen und Fakten. J Dtsch Dermatol Ges 2015. [DOI: 10.1111/ddg.20_12737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Alexander Zink
- Klinik und Poliklinik für Dermatologie und Allergologie am Biederstein; Technische Universität München; München Deutschland
- Institut für Umweltmedizin; UNIKA-T, Technische Universität München; München Deutschland
| | - Claudia Traidl-Hoffmann
- Institut für Umweltmedizin; UNIKA-T, Technische Universität München; München Deutschland
- CK-CARE; Christine Kühne Center for Allergy Research and Education; Davos Schweiz
- Ambulanz für Umweltmedizin; Klinikum Augsburg; Augsburg Deutschland
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13
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Abstract
Green tea consumption has a long tradition in Asian countries--especially China. The epidemiologically and experimentally observed anticarcinogenic and antiinflammatory effects of green tea have led to the implementation of green tea extracts in multiple therapeutic applications - both in dermatological and cosmeceutical preparations. The most abundant evidence exists for the anticarcinogenic and chemopreventive effect of green tea or its major constituent epigallocatechin-3-gallate. Almost equally evident is the effect in infectious diseases such as cutaneous viral infections. For external genital warts, a topical ointment with green tea extracts was licensed in the USA in 2010, and recently also in Europe. Experimental evidence pinpointing the block of central signal transduction factors in inflammatory mechanisms has led to the evaluation of catechins in inflammatory disorders such as atopic dermatitis. The belief of green tea as a "wonder weapon" against diseases dates back thousands of years. According to a Chinese legend, ancient Emperor Shen Nung noted a delightful aroma after some leaves of a nearby tree had fallen into boiling water. He immediately proclaimed the new "drink" as "heaven-sent", starting the belief - persisting until today - of green tea as a medication from nature against many different diseases. This review summarizes biological effects and clinical implications of green tea.
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Affiliation(s)
- Alexander Zink
- Department of Dermatology and Allergy Biederstein, Technische Universität München, Munich, Germany.,Institute for environmental medicine, UNIKA-T, Technischen Universität München, Munich, Germany
| | - Claudia Traidl-Hoffmann
- Institute for environmental medicine, UNIKA-T, Technischen Universität München, Munich, Germany.,CK-CARE, Christine Kühne Center for Allergy Research and Education, Davos, Switzerland.,Outpatient Clinic for environmental medicine, Klinikum Augsburg, Augsburg, Germany
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14
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Honda Y, Tanaka T, Tokuda T, Kashiwagi T, Kaida K, Hieda A, Umezaki Y, Hashimoto Y, Imai K, Matsumoto N, Baba S, Shimizutani K. Local Controlled Release of Polyphenol Conjugated with Gelatin Facilitates Bone Formation. Int J Mol Sci 2015; 16:14143-57. [PMID: 26110386 PMCID: PMC4490544 DOI: 10.3390/ijms160614143] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2015] [Revised: 05/28/2015] [Accepted: 06/08/2015] [Indexed: 11/16/2022] Open
Abstract
Catechins are extensively used in health care treatments. Nevertheless, there is scarce information about the feasibility of local administration with polyphenols for bone regeneration therapy, possibly due to lack of effective delivery systems. Here we demonstrated that the epigallocatechin-3-gallate-conjugated gelatin (EGCG/Gel) prepared by an aqueous chemical synthesis using 4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-morpholinium chloride (DMT-MM) gradually disintegrated with time and facilitated bone formation in a critical size defect of a mouse calvaria. Conjugation of EGCG with the Gel generated cross-linking between the two molecules, thereby leading to a retardation of the degradation of the EGCG/Gel and to a delayed release of EGCG. The prepared EGCG/Gels represented significant osteogenic capability compared with that of the uncross-linked Gel and the cross-linked Gel with uncombined-EGCG. In vitro experiments disclosed that the EGCG/Gel induced osteoblastogenesis of a mouse mesenchymal stem cell line (D1 cells) within 14 days. Using fluorescently-labeled EGCG/Gel, we found that the fraction of EGCG/Gel adsorbed onto the cell membrane of the D1 cells possibly via a Gel-cell interaction. The interaction might confer the long-term effects of EGCG on the cells, resulting in a potent osteogenic capability of the EGCG/Gel in vivo. These results should provide insight into local controlled release of polyphenols for bone therapy.
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Affiliation(s)
- Yoshitomo Honda
- Institute of Dental Research, Osaka Dental University, 8-1 Kuzuhahanazonocho, Hirakata, Osaka 573-1121, Japan.
| | - Tomonari Tanaka
- Graduate School of Science and Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan.
| | - Tomoko Tokuda
- Department of Orthodontics, Osaka Dental University, 8-1, Kuzuhahanazonocho, Hirakata, Osaka 573-1121, Japan.
| | - Takahiro Kashiwagi
- Department of Oral Implantology, Osaka Dental University; 8-1 Kuzuhahanazonocho, Hirakata, Osaka, 573-1121, Japan.
| | - Koji Kaida
- Department of Oral Implantology, Osaka Dental University; 8-1 Kuzuhahanazonocho, Hirakata, Osaka, 573-1121, Japan.
| | - Ayato Hieda
- Department of Oral Implantology, Osaka Dental University; 8-1 Kuzuhahanazonocho, Hirakata, Osaka, 573-1121, Japan.
| | - Yasuyuki Umezaki
- Department of Oral Implantology, Osaka Dental University; 8-1 Kuzuhahanazonocho, Hirakata, Osaka, 573-1121, Japan.
| | - Yoshiya Hashimoto
- Osaka Dental University; 8-1 Kuzuhahanazonocho, Hirakata, Osaka 573-1121, Japan.
| | - Koichi Imai
- Osaka Dental University; 8-1 Kuzuhahanazonocho, Hirakata, Osaka 573-1121, Japan.
| | - Naoyuki Matsumoto
- Department of Orthodontics, Osaka Dental University, 8-1, Kuzuhahanazonocho, Hirakata, Osaka 573-1121, Japan.
| | - Shunsuke Baba
- Department of Oral Implantology, Osaka Dental University; 8-1 Kuzuhahanazonocho, Hirakata, Osaka, 573-1121, Japan.
| | - Kimishige Shimizutani
- Institute of Dental Research, Osaka Dental University, 8-1 Kuzuhahanazonocho, Hirakata, Osaka 573-1121, Japan.
- Department of Oral Radiology, Osaka Dental University, 8-1 Kuzuhahanazonocho, Hirakata, Osaka 573-1121, Japan.
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15
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Shen CL, Chyu MC, Wang JS. Tea and bone health: steps forward in translational nutrition. Am J Clin Nutr 2013; 98:1694S-1699S. [PMID: 24172296 PMCID: PMC3831545 DOI: 10.3945/ajcn.113.058255] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Osteoporosis is a major health problem in the aging population worldwide. Cross-sectional and retrospective evidence indicates that tea consumption may be a promising approach in mitigating bone loss and in reducing risk of osteoporotic fractures among older adults. Tea polyphenols enhance osteoblastogenesis and suppress osteoclastogenesis in vitro. Animal studies reveal that intake of tea polyphenols have pronounced positive effects on bone as shown by higher bone mass and trabecular bone volume, number, and thickness and lower trabecular separation via increasing bone formation and inhibition of bone resorption, resulting in greater bone strength. These osteoprotective effects appear to be mediated through antioxidant or antiinflammatory pathways along with their downstream signaling mechanisms. A short-term clinical trial of green tea polyphenols has translated the findings from ovariectomized animals to postmenopausal osteopenic women through evaluation of bioavailability, safety, bone turnover markers, muscle strength, and quality of life. For future studies, preclinical animal studies to optimize the dose of tea polyphenols for maximum osteoprotective efficacy and a follow-up short-term dose-response trial in postmenopausal osteopenic women are necessary to inform the design of randomized controlled studies in at-risk populations. Advanced imaging technology should also contribute to determining the effective dose of tea polyphenols in achieving better bone mass, microarchitecture integrity, and bone strength, which are critical steps for translating the putative benefit of tea consumption in osteoporosis management into clinical practice and dietary guidelines.
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Affiliation(s)
- Chwan-Li Shen
- Department of Pathology (C-LS and M-CC) and the Laura W Bush Institute for Women's Health (C-LS), Texas Tech University Health Sciences Center, Lubbock, TX; the Department of Mechanical Engineering and the Graduate Healthcare Engineering Option, Texas Tech University, Lubbock, TX (M-CC); and the Department of Environmental Health Science, University of Georgia, Athens, GA (J-SW)
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16
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Green tea and bone health: Evidence from laboratory studies. Pharmacol Res 2011; 64:155-61. [PMID: 21473914 DOI: 10.1016/j.phrs.2011.03.012] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/10/2011] [Revised: 03/23/2011] [Accepted: 03/25/2011] [Indexed: 01/22/2023]
Abstract
Osteoporosis is a major health problem in the elderly. Epidemiological evidence has shown an association between tea consumption and the prevention of bone loss in the elderly population. Ingestion of green tea and green tea bioactive compounds may be beneficial in mitigating bone loss of this population and decreasing their risk of osteoporotic fractures. This review describes the effect of green tea with its bioactive components on bone health with an emphasis on the following: (i) the etiology of osteoporosis, (ii) evidence of osteo-protective impacts of green tea on bone mass and microarchitecture in various bone loss models in which induced by aging, sex hormone deficiency, and chronic inflammation, (iii) discussion of impacts of green tea on bone mass in two obesity models, (iv) observation of short-term green tea supplementation given to postmenopausal women with low bone mass, (v) possible mechanisms for the osteo-protective effects of green tea bioactive compounds, and (vi) a summary and future research direction of green tea and bone health.
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17
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Shen CL, Yeh JK, Cao JJ, Tatum OL, Dagda RY, Wang JS. Synergistic effects of green tea polyphenols and alphacalcidol on chronic inflammation-induced bone loss in female rats. Osteoporos Int 2010; 21:1841-52. [PMID: 20069278 PMCID: PMC2919589 DOI: 10.1007/s00198-009-1122-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/03/2009] [Accepted: 10/14/2009] [Indexed: 12/19/2022]
Abstract
UNLABELLED Studies suggest that green tea polyphenols (GTP) or alphacalcidol is promising agent for preventing bone loss. Findings that GTP supplementation plus alphacalcidol administration increased bone mass via a decrease of oxidative stress and inflammation suggest a significant role of GTP plus alphacalcidol in bone health of patients with chronic inflammation. INTRODUCTION Studies have suggested that green tea polyphenols (GTP) or alphacalcidol are promising dietary supplements for preventing bone loss in women. However, the mechanism(s) related to the possible osteo-protective role of GTP plus D(3) in chronic inflammation-induced bone loss is not well understood. METHODS This study evaluated bioavailability, efficacy, and related mechanisms of GTP in combination with alphacalcidol in conserving bone loss in rats with chronic inflammation. A 12-week study of 2 (no GTP vs. 0.5% GTP in drinking water) × 2 (no alphacalcidol vs. 0.05 μg/kg alphacalcidol, 5×/week) factorial design in lipopolysaccharide-administered female rats was performed. In addition, a group receiving placebo administration was used to compare with a group receiving lipopolysaccharide administration only to evaluate the effect of lipopolysaccharide. RESULTS Lipopolysaccharide administration resulted in lower values for bone mass, but higher values for serum tartrate-resistant acid phosphatase (TRAP), urinary 8-hydroxy-2'-deoxyguanosine, and mRNA expression of tumor necrosis factor-α and cyclooxygenase-2 in spleen. GTP supplementation increased urinary epigallocatechin and epicatechin concentrations. Both GTP supplementation and alphacalcidol administration resulted in a significant increase in bone mass, but a significant decrease in serum TRAP levels, urinary 8-hydroxydeoxyguanosine levels, and mRNA expression of tumor necrosis factor-α and cyclooxygenase-2 in spleen. A synergistic effect of GTP and alphacalcidol was observed in these parameters. Neither GTP nor alphacalcidol affected femoral bone area or serum osteocalcin. CONCLUSION We conclude that a bone-protective role of GTP plus alphacalcidol during chronic inflammation bone loss may be due to a reduction of oxidative stress damage and inflammation.
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Affiliation(s)
- C-L Shen
- Department of Pathology, Texas Tech University Health Sciences Center, BB 198, 3601 4th street, Lubbock, TX 79430-9097, USA.
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18
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Ahmed S. Green tea polyphenol epigallocatechin 3-gallate in arthritis: progress and promise. Arthritis Res Ther 2010; 12:208. [PMID: 20447316 PMCID: PMC2888220 DOI: 10.1186/ar2982] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Green tea's active ingredient, epigallocatechin 3-gallate (EGCG), has gained significant attention among scientists and has been one of the leading plant-derived molecules studied for its potential health benefits. In the present review I summarize the findings from some of the most significant preclinical studies with EGCG in arthritic diseases. The review also addresses the limitations of the dose, pharmacokinetics, and bioavailability of EGCG in experimental animals and findings related to the EGCG-drug interaction. Although these findings provide scientific evidence of the anti-rheumatic activity of EGCG, further preclinical studies are warranted before phase clinical trials could be initiated with confidence for patients with joint diseases.
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Affiliation(s)
- Salahuddin Ahmed
- Department of Pharmacology, 2232 Wolfe Hall, College of Pharmacy, 2801 W, Bancroft Street, Toledo, OH 43606, USA.
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19
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Chen DD, Dong YG, Liu D, He JG. EPIGALLOCATECHIN-3-GALLATE ATTENUATES CARDIAC HYPERTROPHY IN HYPERTENSIVE RATS IN PART BY MODULATION OF MITOGEN-ACTIVATED PROTEIN KINASE SIGNALS. Clin Exp Pharmacol Physiol 2009; 36:925-32. [DOI: 10.1111/j.1440-1681.2009.05173.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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20
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Shen CL, Yeh JK, Cao JJ, Wang JS. Green tea and bone metabolism. Nutr Res 2009; 29:437-56. [PMID: 19700031 PMCID: PMC2754215 DOI: 10.1016/j.nutres.2009.06.008] [Citation(s) in RCA: 104] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2009] [Revised: 06/18/2009] [Accepted: 06/30/2009] [Indexed: 01/01/2023]
Abstract
Osteoporosis is a major health problem in both elderly women and men. Epidemiological evidence has shown an association between tea consumption and the prevention of age-related bone loss in elderly women and men. Ingestion of green tea and green tea bioactive compounds may be beneficial in mitigating bone loss of this population and decreasing their risk of osteoporotic fractures. This review describes the effect of green tea or its bioactive components on bone health, with an emphasis on (i) the prevalence and etiology of osteoporosis; (ii) the role of oxidative stress and antioxidants in osteoporosis; (iii) green tea composition and bioavailability; (iv) the effects of green tea and its active components on osteogenesis, osteoblastogenesis, and osteoclastogenesis from human epidemiological, animal, as well as cell culture studies; (v) possible mechanisms explaining the osteoprotective effects of green tea bioactive compounds; (vi) other bioactive components in tea that benefit bone health; and (vii) a summary and future direction of green tea and bone health research and the translational aspects. In general, tea and its bioactive components might decrease the risk of fracture by improving bone mineral density and supporting osteoblastic activities while suppressing osteoclastic activities.
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Affiliation(s)
- Chwan-Li Shen
- Department of Pathology, Texas Tech University Health Sciences Center, Lubbock, TX 79430-9097, USA.
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