中国组织工程研究 ›› 2025, Vol. 29 ›› Issue (12): 2438-2443.doi: 10.12307/2025.371

• 骨组织构建 bone tissue construction • 上一篇    下一篇

山姜素调节cAMP/PKA/CREB信号通路促进骨质疏松性骨折大鼠骨折愈合

陆  飞1,周  静2,金  涛3   

  1. 1连云港市第一人民医院康复医学科,江苏省连云港市  222000;2南京医科大学康达学院康复医学部,江苏省连云港市  222000;3中国人民解放军东部战区总医院健康医学科,江苏省南京市  210018

  • 收稿日期:2024-03-26 接受日期:2024-05-14 出版日期:2025-04-28 发布日期:2024-09-09
  • 通讯作者: 金涛,硕士,副主任医师,中国人民解放军东部战区总医院健康医学科,江苏省南京市 210018
  • 作者简介:陆飞,男,1986年生,江苏省连云港市人,汉族,2021年苏州大学毕业,硕士,副主任技师,主要从事肌骨、肿瘤康复的研究。
  • 基金资助:
    连云港市科学技术协会项目(Lkxyb2101),项目负责人:陆飞

Alpinetin promotes fracture healing in rats with osteoporotic fracture by regulating the cAMP/PKA/CREB signaling pathway

Lu Fei1, Zhou Jing2, Jin Tao3   

  1. 1Department of Rehabilitation Medicine, The First People’s Hospital of Lianyungang, Lianyungang 222000, Jiangsu Province, China; 2Department of Rehabilitation Medicine, Kangda College of Nanjing Medical University, Lianyungang 222000, Jiangsu Province, China; 3Department of Health Medicine, General Hospital of Eastern Theater Command of Chinese PLA, Nanjing 210018, Jiangsu Province, China
  • Received:2024-03-26 Accepted:2024-05-14 Online:2025-04-28 Published:2024-09-09
  • Contact: Jin Tao, Master, Associate chief physician, Department of Health Medicine, General Hospital of Eastern Theater Command of Chinese PLA, Nanjing 210018, Jiangsu Province, China
  • About author:Lu Fei, Master, Associate chief technician, Department of Rehabilitation Medicine, The First People’s Hospital of Lianyungang, Lianyungang 222000, Jiangsu Province, China
  • Supported by:
     Lianyungang Association for Science and Technology Project, No. Lkxyb2101 (to LF)

摘要:




文题释义:
环磷酸腺苷/蛋白激酶A/环磷酸腺苷反应元件结合蛋白(cAMP/PKA/CREB)信号通路:环磷酸腺苷在各种反馈机制和细胞信号转导中是一个重要的次级信使,是下游蛋白激酶A的主要激活因子。反过来,蛋白激酶A激活环磷酸腺苷反应元件结合蛋白,环磷酸腺苷反应元件结合蛋白作为转录增强子调节基因转录,如cyclin D1和c-Jun。环磷酸腺苷/蛋白激酶A/环磷酸腺苷反应元件结合蛋白通路是一种典型的细胞内信号通路,在骨质疏松性骨折的进展中起重要作用。
山姜素:是一种从山姜科植物中分离出来的天然黄酮类化合物,具有抗炎、镇痛、抗氧化、抗肿瘤等药理活性,已被用于治疗急性胃炎、结肠炎、高血压、高脂血症和炎症相关疾病,但其在骨质疏松性骨折中的作用尚未完全阐明。

背景:山姜素具有抗炎、抗肿瘤、抗菌等作用,已被证实能够缓解骨质疏松症,但山姜素对骨质疏松性骨折的影响及机制仍不清楚。
目的:探讨山姜素调节环磷酸腺苷/蛋白激酶A/环磷酸腺苷反应元件结合蛋白信号通路对骨质疏松性骨折大鼠的改善作用。
方法:采用双侧卵巢切除手术构建骨质疏松症骨折大鼠模型,将成功造模大鼠依据随机数字表法分为山姜素低、中、高剂量组、抑制剂组和模型组,另选12只大鼠作为假手术组。骨折造模当天,山姜素低、中、高剂量组大鼠灌胃7.5,15,30 mg/kg的山姜素+腹腔注射等量的生理盐水,抑制剂组灌胃30 mg/kg的山姜素+腹腔注射5 mg/kg的H-89(通路抑制剂),模型组与假手术组给予(灌胃+腹腔注射)等量生理盐水,1次/d,连续8周。放射性检查评估大鼠骨折愈合情况并进行愈合评分;骨密度扫描仪测定骨折处骨密度;通过三点弯曲实验和压缩实验评估大鼠股骨生物力学状况;苏木精-伊红染色观察大鼠骨折处病理损伤;酶联免疫吸附(ELISA)法检测血清碱性磷酸酶、骨钙素和Ⅰ型胶原交联C-末端肽、环磷酸腺苷水平的变化;Western blot检测股骨组织中骨形态发生蛋白2和环磷酸腺苷/蛋白激酶A/环磷酸腺苷反应元件结合蛋白通路蛋白表达。
结果与结论:①相较于假手术组,模型组大鼠骨折愈合评分、骨密度、最大负荷、最大应力、碱性磷酸酶、骨钙素、环磷酸腺苷水平、骨形态发生蛋白2、磷酸化蛋白激酶A/蛋白激酶A、磷酸化环磷酸腺苷反应元件结合蛋白/环磷酸腺苷反应元件结合蛋白表达下降,Ⅰ型胶原交联羧基末端肽水平增加(P < 0.05);与模型组比较,山姜素各剂量组大鼠上述各项指标呈现相反的变化(P < 0.05);与山姜素高剂量组比较,抑制剂组大鼠上述指标变化均被逆转(P < 0.05)。②结论:山姜素可能通过激活环磷酸腺苷/蛋白激酶A/环磷酸腺苷反应元件结合蛋白信号通路加速骨质疏松症骨折大鼠的骨折愈合。

关键词: 山姜素, 环磷酸腺苷/蛋白激酶A/环磷酸腺苷反应元件结合蛋白, 骨质疏松, 骨折愈合, 大鼠

Abstract: BACKGROUND: Alpinetin has anti-inflammatory, antitumor and antibacterial effects and has been proven to alleviate osteoporosis, but the effect and mechanism of alpinetin on osteoporotic fractures are still unclear.
OBJECTIVE: To investigate the improvement effect of alpinetin in rates with osteoporotic fracture by regulating the cyclic adenosine monophosphate (cAMP)/protein kinase A (PKA)/cAMP-responsive element binding protein (CREB) signaling pathway. 
METHODS: A rat model of osteoporotic fracture was constructed using bilateral ovariectomy. The successfully modeled rats were randomly separated into model group, low-, medium-, and high-dose alpinetin group, and inhibitor group, with 12 rats per group. Another 12 rats were regarded as the sham operation group. On the day of fracture, rats in the low-, medium-, and high-dose alpinetin groups were gavaged with 7.5, 15, and 30 mg/kg alpinetin + intraperitoneally injected with an equal amount of normal saline, respectively; the inhibitor group was gavaged with 30 mg/kg alpinetin + intraperitoneally injected with 5 mg/kg 
H-89 (a pathway inhibitor); and the model and sham operation groups were given (gavaged + intraperitoneally injected) an equal amount of normal saline, once a day for 8 consecutive weeks. Radiological examination was applied to evaluate fracture healing and assess healing scores; bone mineral density scanners were used to measure bone mineral density at the fracture site; three-point bending experiment and compression experiment were conducted to evaluate the biomechanical status of the femur; pathological damage at the fracture site in rats was observed by hematoxylin-eosin staining; enzyme linked immunosorbent assay (ELISA) was used to detect changes in serum alkaline phosphatase, osteocalcin, type I collagen cross-linked C-terminal peptide, and cAMP levels; western blot was applied to detect the expression of bone morphogenetic protein 2 and cAMP/PKA/CREB pathway proteins in femoral tissue. 
RESULTS AND CONCLUSION: Compared with the sham operation group, the fracture healing score, bone mineral density, maximum load, maximum stress, alkaline phosphatase, osteocalcin, cAMP levels, bone morphogenetic protein 2, p-PKA/PKA, p-CREB/CREB expression in the model group were decreased, the level of type I collagen cross-linked C-terminal peptide was increased (P < 0.05). The above indicators showed opposite changes in all the alpinetin groups compared with the model group (P < 0.05). Compared with the high-dose alpinetin group, the changes in the above indicators were reversed in the inhibitor group (P < 0.05). To conclude, alpinetin may accelerate fracture healing in osteoporotic fracture rats, by activating the cAMP/PKA/CREB signaling pathway.

中国组织工程研究杂志出版内容重点:组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松;组织工程

Key words: alpinetin, cyclic adenosine monophosphate/protein kinase A/cyclic adenosine monophosphate-responsive element binding protein, osteoporosis, fracture healing, rat

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