There is plenty of literature on masticatory function and its impact on maxillofacial development. However, the influence of masticatory hypofunction on bone turnover in the alveolar bone has hardly been studied. This...There is plenty of literature on masticatory function and its impact on maxillofacial development. However, the influence of masticatory hypofunction on bone turnover in the alveolar bone has hardly been studied. This study aimed to clarify the influence of tooth loss and soft diet on the alveolar bone turnover during the growth period. Three-week-old Wistar rats were randomly divided into the following three groups: Hard diet group (rats raised on solid standard diet), Powder diet group (rats raised on powdered standard feed diet), and Extraction group (rats raised on powdered standard diet with maxillary molars extraction). BV, BMC, and BMD in the cancellous bone of M1 were measured using micro-CT analysis. To analyze the histological bone turnover, we prepared non-decalcified thin sections of alveolar cancellous bone when rats were 20 weeks old. On three-dimensional constructed images, the experimental groups (the Powder diet and Extraction groups) showed expansion of the medullary cavity of the interradicular septum of the first molar compared to controls (the Hard diet group). BV, BMC, and BMD were significantly lower in the experimental groups, with the difference from controls being greater in the Extraction group. On histomorphometric analysis, the bone mass parameters, bone formation parameters, and bone mineralization parameters were significantly lower in the experimental groups compared to controls. The bone resorption parameters were significantly higher in the experimental groups. From this study, we found that soft diet and tooth loss might worsen the bone microstructure, reduce osteogenesis, and promote bone resorption in alveolar bone.展开更多
Objective: To clarify whether the acupoints of Zusanli (ST36) and Sanyinjiao (SP6) have specific actions other than non-acupoints to bone. Methods: Forty Sprague-Dawley female rats were divided into five groups...Objective: To clarify whether the acupoints of Zusanli (ST36) and Sanyinjiao (SP6) have specific actions other than non-acupoints to bone. Methods: Forty Sprague-Dawley female rats were divided into five groups: Sham operated (sham) group; Ovariectomized (OVX, model) group; non-acupuncture group; OVX, needling on Zusanli and Sanyinjiao (Acp-A) group; OVX, needling on the reverse sides of Zusanli and Sanyinjiao (Acp-B) group; OVX, periostineal stimulation on the same height as points of Zusanli and Sanyinjiao (Acp-C) group. The experiment was continued for 23 weeks and then all animals were sacrificied. Results: OVX had a significantly higher body weight and lower bone mineral density (BMD) on the lumbar vertebrae, total femora and tibiae than sham rats, however, Acp-A showed a higher BMD compared with the other OVX groups. On the other hand, bone weights, bone strength and bone morphometry such as trabecular volume, trabecular separation, labeled width and bone formation rate also showed the same improvements in Acp-A as compared to the other OVX rats. Conclusion: The stimulation on Zusanli and Sanyinjiao specifically prevented the development of osteopenic rats compared with non-acupoints.展开更多
Objective: To observe the effects of Bushen Zhuanggu Formul on intedeukin 6 (IL-6) level and bone metabolism of the ovariectomized rats, and to explore the possible mechanism of preventing and treating postmenopaus...Objective: To observe the effects of Bushen Zhuanggu Formul on intedeukin 6 (IL-6) level and bone metabolism of the ovariectomized rats, and to explore the possible mechanism of preventing and treating postmenopausal osteo porosis by traditional Chinese Formul. Methods: SD rats were randomly divided into 4 groups: normal control group (N), ovariectomized control group (OVX), estrogen-treated group (OVX+E) traditional and Chinese medicine-treated group (OVX+ CM). After treaanent, IL-6 levels in rat bone tissue media and serum were examined by ELISA. The proximal tibias(PTM) of rats were undecalcified for quantitative bone histomorphometry. Results: Compared with OVX group, both Bushen Zhuanggu medicine and estrogen decreased IL-6 level in rat bone tissue media. However, the effects of Bushen Zhuanggu Formul were weaker than those of estrogen. Furthermore, Bushen Zhuanggu Formul and estrogen produced a reduction in bone turnover by inhibiting bone formation and bone resorption at the same time. Conclusion: Bushen Zhuanggu Formul prevents ovariectomic bone loss by inhibiting IL-6 production in rat bone tissues.展开更多
Objective:To investigate the effects of chronic sleep deprivation(CSD)on bone microstructure and peak bone mass(PBM)in SD rats.Methods:Twenty-four SD rats were randomly divided into CSD group and control group.In the ...Objective:To investigate the effects of chronic sleep deprivation(CSD)on bone microstructure and peak bone mass(PBM)in SD rats.Methods:Twenty-four SD rats were randomly divided into CSD group and control group.In the CSD group,a CSD model was established using a new sleep deprivation instrument for rats and mice,and intervened for 5 weeks.Bone turnover markers including P1NP and CTX-1 before and after the experiment were observed.After the experiment,the left femur were scanned by Micro-CT,and the cortical bone and bone trabecula were three-dimensionally reconstructed,respectively.The bone mineral density(BMD)and relevant parameters were detected.Results:CT images of the femur(proximal ends)showed significant trabecular loss in CSD rats.Trabecular parameters including bone volume fraction(BV/TV),trabecular number(Tb.N)and trabecular separation(Tb.Sp)in the CSD group were all lower than those in the control group.The bone cortex of the middle segment of the femur and tibia in CSD rats was also lower than that in the control group.The parameters of bone cortex including total tissue area(Tt.Ar),cortical bone area(Ct.Ar)and cortical bone thickness(Ct.Th)in the CSD group were significantly lower than those in the control group(P<0.01).After chronic CSD,BMD of both bone trabecula and bone cortex of the femur was lower,while the corresponding P1NP and CTX-1 were significantly higher than those in the control group.Conclusion:Sleep plays an important role in PBM formation.CSD accelerates bone turnover and thus significantly reducing PBM in SD rats.展开更多
1960年,美国骨整形外科医生Harold Frost提出一种定量研究骨微结构和骨量的技术——骨组织形态计量学(BHMT),其采用不脱钙硬包埋法和活体荧光标记法进行骨组织标本制作,更好地保留了骨组织微细结构。50多年来的实践证实BHMT是目前评价...1960年,美国骨整形外科医生Harold Frost提出一种定量研究骨微结构和骨量的技术——骨组织形态计量学(BHMT),其采用不脱钙硬包埋法和活体荧光标记法进行骨组织标本制作,更好地保留了骨组织微细结构。50多年来的实践证实BHMT是目前评价骨转换与骨矿化最常用和有效的实验手段,至今仍是骨代谢和矿化评价的金标准。目前国际上有两套常用的标准骨组织形态计量学方法:一是Harold Frost与美国犹他大学医学院放射生物系Webster S.S.Jee教授及Sun Valley Hard Tissue Workshops一起发展并提出的BHMT标准命名法,下文简称Dr.Frost and Jee教授团队命名法。二是在美国医生A.Michael Parfitt于1980年提出的一套强调骨组织微结构研究重要性的体视学测量方法基础上,由美国骨矿研究协会(ASBMR)综合提出的标准命名法(1987年第一版和2012年第二版)。上述两种系统命名法均使用广泛,每套系统的指标都很多且各有侧重,使用时可按具体实验需要选择最为适用的系统。本文将讨论2种方法的异同点及其在BHMT研究中的应用。展开更多
文摘There is plenty of literature on masticatory function and its impact on maxillofacial development. However, the influence of masticatory hypofunction on bone turnover in the alveolar bone has hardly been studied. This study aimed to clarify the influence of tooth loss and soft diet on the alveolar bone turnover during the growth period. Three-week-old Wistar rats were randomly divided into the following three groups: Hard diet group (rats raised on solid standard diet), Powder diet group (rats raised on powdered standard feed diet), and Extraction group (rats raised on powdered standard diet with maxillary molars extraction). BV, BMC, and BMD in the cancellous bone of M1 were measured using micro-CT analysis. To analyze the histological bone turnover, we prepared non-decalcified thin sections of alveolar cancellous bone when rats were 20 weeks old. On three-dimensional constructed images, the experimental groups (the Powder diet and Extraction groups) showed expansion of the medullary cavity of the interradicular septum of the first molar compared to controls (the Hard diet group). BV, BMC, and BMD were significantly lower in the experimental groups, with the difference from controls being greater in the Extraction group. On histomorphometric analysis, the bone mass parameters, bone formation parameters, and bone mineralization parameters were significantly lower in the experimental groups compared to controls. The bone resorption parameters were significantly higher in the experimental groups. From this study, we found that soft diet and tooth loss might worsen the bone microstructure, reduce osteogenesis, and promote bone resorption in alveolar bone.
文摘Objective: To clarify whether the acupoints of Zusanli (ST36) and Sanyinjiao (SP6) have specific actions other than non-acupoints to bone. Methods: Forty Sprague-Dawley female rats were divided into five groups: Sham operated (sham) group; Ovariectomized (OVX, model) group; non-acupuncture group; OVX, needling on Zusanli and Sanyinjiao (Acp-A) group; OVX, needling on the reverse sides of Zusanli and Sanyinjiao (Acp-B) group; OVX, periostineal stimulation on the same height as points of Zusanli and Sanyinjiao (Acp-C) group. The experiment was continued for 23 weeks and then all animals were sacrificied. Results: OVX had a significantly higher body weight and lower bone mineral density (BMD) on the lumbar vertebrae, total femora and tibiae than sham rats, however, Acp-A showed a higher BMD compared with the other OVX groups. On the other hand, bone weights, bone strength and bone morphometry such as trabecular volume, trabecular separation, labeled width and bone formation rate also showed the same improvements in Acp-A as compared to the other OVX rats. Conclusion: The stimulation on Zusanli and Sanyinjiao specifically prevented the development of osteopenic rats compared with non-acupoints.
基金National Natural Science Foundation of China(39770930)
文摘Objective: To observe the effects of Bushen Zhuanggu Formul on intedeukin 6 (IL-6) level and bone metabolism of the ovariectomized rats, and to explore the possible mechanism of preventing and treating postmenopausal osteo porosis by traditional Chinese Formul. Methods: SD rats were randomly divided into 4 groups: normal control group (N), ovariectomized control group (OVX), estrogen-treated group (OVX+E) traditional and Chinese medicine-treated group (OVX+ CM). After treaanent, IL-6 levels in rat bone tissue media and serum were examined by ELISA. The proximal tibias(PTM) of rats were undecalcified for quantitative bone histomorphometry. Results: Compared with OVX group, both Bushen Zhuanggu medicine and estrogen decreased IL-6 level in rat bone tissue media. However, the effects of Bushen Zhuanggu Formul were weaker than those of estrogen. Furthermore, Bushen Zhuanggu Formul and estrogen produced a reduction in bone turnover by inhibiting bone formation and bone resorption at the same time. Conclusion: Bushen Zhuanggu Formul prevents ovariectomic bone loss by inhibiting IL-6 production in rat bone tissues.
基金2020 Youth Training Fund Project of the First Affiliated Hospital of Hainan Medical University(No.202010)
文摘Objective:To investigate the effects of chronic sleep deprivation(CSD)on bone microstructure and peak bone mass(PBM)in SD rats.Methods:Twenty-four SD rats were randomly divided into CSD group and control group.In the CSD group,a CSD model was established using a new sleep deprivation instrument for rats and mice,and intervened for 5 weeks.Bone turnover markers including P1NP and CTX-1 before and after the experiment were observed.After the experiment,the left femur were scanned by Micro-CT,and the cortical bone and bone trabecula were three-dimensionally reconstructed,respectively.The bone mineral density(BMD)and relevant parameters were detected.Results:CT images of the femur(proximal ends)showed significant trabecular loss in CSD rats.Trabecular parameters including bone volume fraction(BV/TV),trabecular number(Tb.N)and trabecular separation(Tb.Sp)in the CSD group were all lower than those in the control group.The bone cortex of the middle segment of the femur and tibia in CSD rats was also lower than that in the control group.The parameters of bone cortex including total tissue area(Tt.Ar),cortical bone area(Ct.Ar)and cortical bone thickness(Ct.Th)in the CSD group were significantly lower than those in the control group(P<0.01).After chronic CSD,BMD of both bone trabecula and bone cortex of the femur was lower,while the corresponding P1NP and CTX-1 were significantly higher than those in the control group.Conclusion:Sleep plays an important role in PBM formation.CSD accelerates bone turnover and thus significantly reducing PBM in SD rats.
文摘1960年,美国骨整形外科医生Harold Frost提出一种定量研究骨微结构和骨量的技术——骨组织形态计量学(BHMT),其采用不脱钙硬包埋法和活体荧光标记法进行骨组织标本制作,更好地保留了骨组织微细结构。50多年来的实践证实BHMT是目前评价骨转换与骨矿化最常用和有效的实验手段,至今仍是骨代谢和矿化评价的金标准。目前国际上有两套常用的标准骨组织形态计量学方法:一是Harold Frost与美国犹他大学医学院放射生物系Webster S.S.Jee教授及Sun Valley Hard Tissue Workshops一起发展并提出的BHMT标准命名法,下文简称Dr.Frost and Jee教授团队命名法。二是在美国医生A.Michael Parfitt于1980年提出的一套强调骨组织微结构研究重要性的体视学测量方法基础上,由美国骨矿研究协会(ASBMR)综合提出的标准命名法(1987年第一版和2012年第二版)。上述两种系统命名法均使用广泛,每套系统的指标都很多且各有侧重,使用时可按具体实验需要选择最为适用的系统。本文将讨论2种方法的异同点及其在BHMT研究中的应用。