Ⅵ型成骨不全癥致病基因突變分析及成骨不全癥血清PEDF水平研究
[Abstract]:Background: The osteogenesis imperfecta, 01 is a single-gene genetic disease characterized by increased bone fragility and osteopenia. Type VI OI is an autosomal recessive inheritance, which is a rare type of OI. PEDF is a secreted glycoprotein encoded by the SERPINF1 gene. Osteoblasts and osteoclast activity may be regulated by a variety of signal pathways in bone metabolism and interact with vascular endothelial growth factor (VEGF) to affect bone mineralization. Objective: To study the phenotypic characteristics of the patients with type VI OI, to detect the mutation type of SERPINF1, and to detect the serum PEDF levels in 134 patients with different types of OI, and to analyze their value in the diagnosis and treatment of type VI OI patients. The possible role of PEDF in the pathogenesis of OI was discussed. Methods: Six patients with OI from the five non-close-of-the-kin-family system were included to assess the clinical manifestations, serum calcium and phosphorus and bone turnover index and bone X-ray performance. Bone mineral density was measured by dual energy X-ray absorption meter (DXA). the gene chip with independent design is adopted, and the pathogenic gene mutation detection is carried out by the second generation sequencing technology. Among the 94 patients with OI, 6 SERPINFl gene mutation carriers and 24 age-matched normal controls were included in 94 cases of molecular diagnosis. The serum PEDF content was detected by enzyme-linked immunosorbent assay (ELISA). The relationship between the serum PEDF level and the patient's age, sex, height, body weight, body mass index, bone turnover index, 25-hydroxyvitamin D, parathyroid hormone, bone mineral density, severity of the disease, and the efficacy of the digluconate were analyzed. The results of the study: 6 patients with infantile onset, with different degrees of skeletal deformity, no blue sclera, dentine hypoplasia, or hearing disorder. The imaging features were severe osteoporosis, and the popcorn-like changes in the long-shaft bone were observed. bone delayed union, and the like. One patient was the third exon-only mutation, c. 271 279dupGCCCTCTCG (p. Ala91 Ser93dup), one case was the third intron and the fifth exon compound hybrid mutation, c. 283 + 1GT, c. 498 _ 499de1CA (p. Arg167SerfX35), and one patient was the eighth exon-only mutation, c. 1202 _ 1203delCA (p. Thr401ArgfsX); One patient was a compound heterozygous mutation in exon 3, c. 184GA (p. Gly62Ser), c. 271 _ 279dupGCCCTCG (p. Ala91 _ Ser93dup), and finally from two patients in the same family to a fourth exon heterozygous mutation, c397CT (p. Gln133X). A new mutation of five SERPINF1 genes was detected in this study. The above-mentioned gene mutation significantly decreased the level of PEDF expression in osteoblasts (0.0001-3.93. mu.g/ ml). The serum PEDF content of 6 patients with type VI 0I was determined by the content of PEDF, and the serum PEDF content in the patients with type VI type I was significantly lower than that of the other genotypes (P0.01). The serum P-EDF content and bone turnover index before and after the treatment of the bivalate were significantly decreased (P0.01). There was no significant change in bone mineral density (P = 0.58, 0.78, 0.11, 0.37, 0.83), and the body weight was positively correlated with the serum PEDF level (PEDF = 6.48 + 0.378, body weight Z, r2 = 0.127, P = 0.003). Conclusion: This study first reported the clinical characteristics of the rare autosomal recessive VI-type OI patients with SERPINF1 gene mutation in China, and the new mutation of five SERPINF1 genes was detected in Chinese patients. The significant decrease in serum PEDF content has a unique diagnostic value for patients with type VI OI, but the role of PEDF in the pathogenesis of type VI OI is to be further studied. The fat cells can secrete PEDF in a large amount, so the body weight can be one of the factors of the serum PEDF level. The treatment of bivalate does not affect the serum PEDF level, bone turnover index and bone mineral density of the patients with type VI OI, so the novel monoclonal antibody-based biological preparation is full of prospect in the treatment of the VI-type OI.
【學位授予單位】:北京協(xié)和醫(yī)學院
【學位級別】:博士
【學位授予年份】:2016
【分類號】:R681.1
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