GENE REGULATION OF RAT DENTIN SIALOPROTEIN

虽然涉及牙本质形成的机制尚不清楚，但它是 很明显，一组独特的细胞外基质（ECM）蛋白 参与前牙本质的形成及其随后的 矿化形成牙本质。成熟的成牙本质细胞分泌胶原蛋白， 矿化处的细胞边界和非胶原蛋白（NCPs） 前（可能通过成牙本质细胞过程）。在这里， 与胶原蛋白复合。形成碳酸磷灰石晶体， 晶体起始和生长位置特异性过程被认为是 由胶原蛋白-NCP复合物控制。 为了阐明细节 牙本质发生，与NCP相关的额外信息， 需要代谢和基因调控。特别感兴趣的是 牙本质ECM中特有的蛋白质。一种牙本质特异性蛋白， 牙本质涎蛋白（DSP）是一种分子量为53 kDa的蛋白质， 与细胞附着蛋白质骨的总体特性相似的蛋白质 唾液酸蛋白（BSP）和骨桥蛋白（OPN）。 然而，DSP是合成的， 仅通过成牙本质细胞和牙髓，而不通过成骨细胞或其它细胞 类型从其cDNA推导的DSP序列与那些 BSP、OPN和其他蛋白质。DSP含有N- 和O-糖基化位点，以及酪蛋白激酶和11 磷酸化位点。北方印迹检测到多个转录本 大约4.6kb和1.5kb。基因组Southern印迹分析 克隆强烈表明存在两个相关的DSP基因。 我们推测DSP的合成和分泌对肿瘤的发生和发展起着至关重要的作用。 形成健康的牙本质。为了验证这个假设，我们将 利用分子生物学技术阐明基因结构， 他们的规则。我们提出以下具体目标：一。以确定 DSP基因的基因组结构。 2. 表征多个 DSP转录本和检查的空间和时间表达 这些成绩单3.表征DSP基因的启动子 包括DNA序列、最小调控序列和核 转录因子和4.研究DSP的潜在调节作用 基因通过信号转导分子。本文中概述的研究 这项提案将为理解重要的 控制牙本质形成的调节事件。

Although the mechanisms involved in dentinogenesis are unknown, it is clear that a unique set of extracellular matrix (ECM) proteins participates in the formation of predentin and its subsequent mineralization to form dentin. Mature odontoblasts secrete collagen at the cell border and non-collagenous proteins (NCPs) at the mineralization front (possibly through odontoblastic processes). Here NCPs form complexes with collagen. Carbonate apatite crystals are formed and this site-specific process of crystal initiation and growth is believed to be controlled by the collagen-NCP complex. In order to elucidate details of dentinogenesis, additional information relative to the NCPs, their metabolism and gene regulation is needed. Of particular interest are proteins found uniquely in dentin ECM. One dentin specific protein, dentin sialoprotein (DSP), a 53 kDa protein, is a sialic acid-rich protein similar in overall properties to cell attachment proteins bone sialoprotein (BSP) and osteopontin (OPN). However, DSP is synthesized only by odontoblasts and dental pulp and not by osteoblasts or other cell types. The sequence of DSP deduced from its cDNA is dissimilar to those of BSP, OPN and other proteins. DSP contains consensus sequences for N- and O-glycosylation sites, as well as casein kinase and 11 phosphorylation sites. Northern blots detected multiple transcripts of approximately 4.6 kb and 1.5 kb. Recent Southern blot analysis of genomic clones strongly suggests the presence of two related DSP genes. We hypothesize that the synthesis and secretion of DSP is crucial to the formation of healthy dentin. In order to test this hypothesis, we will employ molecular biological techniques to elucidate gene structures and their regulation. We propose the following Specific Aims: i. To determine the genomic organization of DSP gene(s). 2. To characterize multiple DSP transcripts and to examine the spatial and temporal expression of these transcripts. 3. To characterize the promoter(s) of DSP gene(s) including DNA sequence, minimal regulatory sequences and nuclear transcription factors and 4. To study the potential regulation of the DSP gene(s) by signal transducing molecules. The studies outlined in this proposal will provide a solid molecular basis for understanding important regulatory events controlling dentinogenesis.