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第44卷第4期                           南京医科大学学报(自然科学版)
                  2024年4月                   Journal of Nanjing Medical University(Natural Sciences)     ·455 ·


               ·基础研究·

                p53半剂量缺失纠正1,25(OH)D3缺乏小鼠的骨质疏松
                                                               2


                张   维 ,倪进荣 ,周       俊 ,刘 畇 ,张群虎        2*
                              2
                                               1*
                                       3
                      1
                南京医科大学康达学院基础医学部人体解剖学系,江苏                      连云港    222000;南京医科大学附属宿迁第一人民医院骨科,江
                1                                                          2
                苏 宿迁     223800;南京医科大学附属宿迁第一人民医院风湿免疫科;江苏                    宿迁 223800
                               3
               [摘   要] 目的:探索p53半剂量缺失杂合子小鼠能否通过增强抗氧化能力纠正活性维生素D(1,25(OH) 2D3)缺乏引起的骨
                质疏松。方法:取10周龄高钙高磷饮食喂养的同窝野生型(wild type,WT)小鼠、p53半剂量缺失杂合子(p53 )小鼠、1α⁃羟化酶
                                                                                                 +/-
                基因敲除[1α(OH)ase ]小鼠及p53半剂量缺失的1α羟化酶基因敲除[1α(OH)ase p53 ]小鼠的长骨,利用X线、micro⁃CT、组
                                                                               -/-
                                 -/-
                                                                                   +/-
                织病理学和分子生物学等方法,比较各组小鼠血清学、长骨骨矿化、骨形成、骨吸收以及氧化应激等表达变化。结果:与WT小
                鼠相比,p53 小鼠血清钙、磷、甲状旁腺素(parathyroid hormone,PTH)和1,25(OH) 2D3水平差异无统计学意义,骨密度、总胶原
                         +/-
               (total collagen,T⁃col)阳性面积、成骨细胞数量、碱性磷酸酶(alkaline phosphatase,ALP)和Ⅰ型胶原(collagen typeⅠ,Col⁃Ⅰ)阳
                性面积均有所增加,活性氧水平降低,抗氧化酶SOD1表达增加。与1α(OH)ase 小鼠相比,1α(OH)ase p53 小鼠血清钙、磷
                                                                                               -/-
                                                                             -/-
                                                                                                   +/-
                和PTH差异无统计学意义,血清中检测不到1,25(OH) 2D3,骨密度、T⁃col阳性面积、成骨细胞数量、ALP和Col⁃Ⅰ阳性面积均明
                显增加,破骨细胞数量减少,活性氧水平降低,抗氧化酶 SOD1 表达增加。结论:p53 半剂量缺失可通过增强抗氧化能力纠正
                1,25(OH) 2D3缺乏小鼠的骨质疏松。
               [关键词] 骨质疏松;p53;1,25(OH) 2D3;氧化应激
               [中图分类号] R591.44                   [文献标志码] A                      [文章编号] 1007⁃4368(2024)04⁃455⁃08
                doi:10.7655/NYDXBNSN230997

                p53 heterozygote attenuates osteoporosis phenotype of 1,25(OH) 2D3 deficient mice
                                     2
                           1
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                                                        1*
                ZHANG Wei ,NI Jinrong ,ZHOU Jun ,LIU Yun ,ZHANG Qunhu  2*
                1                                                                                   2
                Department of Human Anatomy,Kangda College,Nanjing Medical University,Lianyungang 222000;Department of
                Orhopedics,the Affiliated Suqian First People’s Hospital of Nanjing Medical University,Suqian 223800;Department
                                                                                                      3
                of rheumatology and immunology,the Affiliated Suqian First People’s Hospital of Nanjing Medical University,
                Suqian 223800,China
               [Abstract] Objective:To explore whether p53 heterozygote attenuates osteoporosis phenotype of 1,25(OH) 2D3 deficient mice by
                enhancing the antioxidant capacity. Methods:The long bones of 10⁃week⁃old wild type(WT)mice,p53 heterozygote(p53 )mice,
                                                                                                         +/-
                                            -/-
                                                               -/-
                1α⁃hydroxylase knockout[1α(OH)ase ]mice,and 1α(OH)ase p53 +/-  mice,fed on a high⁃calcium and high⁃phosphorus diet,were
                analyzed and compared using X⁃ray,micro⁃CT,histopathological and molecular biology methods to observe and compare changes in
                serum levels,bone mineralization,bone formation,bone absorption,and oxidative stress expression. Results:Compared with WT mice,
                  +/-
                p53 mice showed no significant differences in serum calcium,phosphorus,parathyroid hormone(PTH),and 1,25(OH) 2D3 levels,but
                had the increased bone density,total collagen(T⁃col)positive area,osteoblast number,alkaline phosphatase(ALP),and typeⅠcollagen
               (col⁃Ⅰ)positive area,along with the decreased levels of reactive oxygen species and the increased expression of the antioxidant enzyme
                                         -/-
                                                        -/-
                SOD1. Compared with 1α(OH)ase mice,1α(OH)ase p53 +/-  mice showed no significant differences in serum calcium,phosphorus,
                and PTH levels,with undetectable levels of 1,25(OH) 2D3 in the serum,but showed significantly increased bone density,T⁃col
                positive area,osteoblast number,ALP and Col⁃Ⅰ positive area,decreased osteoclast number and reactive oxygen species levels,and
                increased expression of SOD1. Conclusion:Half⁃dose deletion of p53 can attenuate osteoporosis phenotype of 1,25(OH) 2D3 deficient


               [基金项目] 江苏省高等学校基础科学(自然科学)研究面上项目(22KJB320016);南京医科大学康达学院科研人才培养计划
               (KD2021KYRC025);宿迁市科技计划资助(KY202214);宿迁市科技计划自然科学基金项目(K202001)
                ∗
                通信作者(Corresponding author),E⁃mail:zhang_9086@163.com;15195969201@163.com
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