Modeling of Hyperparathyroidism-Jaw Tumor Syndrome by Targeted Deletion of Hrpt2

通过靶向删除 Hrpt2 来模拟甲状旁腺功能亢进症-颌骨肿瘤综合征

• 批准号: 8003519
• 负责人: Jessica Costa
• 金额: $ 4.84万
• 依托单位: UNIVERSITY OF CONNECTICUT SCH OF MED/DNT
• 依托单位国家: 美国
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-08-01 至 2012-09-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8003519
• 关键词: Address; Affect; Animals; Benign; Body part; Bone neoplasms; Cancer Etiology; Cancerous; Cystic kidney; Development; Endocrine System Diseases; Genes; Genetic; Genetically Engineered Mouse; Hamartoma; Human; Hyperparathyroidism; In Vitro; Individual; Intervention; Jaw; Kidney; Kidney Neoplasms; Knock-out; Lesion; Malignant - descriptor; Malignant Neoplasms; Mandible; Maxilla; Modeling; Molecular; Mouse Strains; Mutation; Neoplasms; Nephroblastoma; Ossifying Fibroma; Parathyroid Gland Adenocarcinoma; Parathyroid Neoplasms; Parathyroid gland; Patients; Research; Research Design; Site; Somatic Mutation; Syndrome; Testing; Transgenic Mice; Tumor Suppressor Genes; Uterine Cancer; Uterus; base; cancer type; fibroma; insight; kindred; malignant parathyroid gland tumor; mouse model; novel diagnostics; offspring; public health relevance; treatment strategy; tumor

DESCRIPTION (provided by applicant): Hyperparathyroidism jaw-tumor syndrome (HPT-JT) is a syndrome that predisposes individuals to the development of one or more benign or malignant parathyroid tumors, ossifying fibromas of the mandible and/or maxilla, benign or malignant uterine tumors and, less commonly, cystic kidney lesions, renal hamartomas or Wilm's tumors. Affected individuals may develop multiple primary parathyroid, jaw, uterine and/or kidney tumors over the course of their lifetime. Inactivating mutations of theHRPT2 tumor suppressor gene (also called CDC73), encoding parafibromin, were identified as the genetic cause of HPT-JT in the majority of affected kindreds. Subsequently, screens of sporadic parathyroid carcinomas, ossifying fibromas of the mandible and renal tumors revealed both germline and somatic mutations of HRPT2. The proposed studies are designed to address the mechanisms through which loss of Hrpt2/parafibromin promotes neoplasia in the parathyroid glands and jaws, in the pathophysiologically relevant experimental context of an intact animal. To study the pathophysiological consequences of knockout of Hrpt2 in vitro, genetically- engineered mice in which the Hrpt2 gene is flanked by two loxP sites have been generated and will be crossed with two different transgenic mouse strains, PTH-Cre and Wnt1-Cre. These crosses will result in offspring with Hrpt2 deletion in the parathyroid glands or mandible, respectively. Development of these two mouse models will provide a means for dissecting the molecular basis of HPT-JT, sporadic parathyroid tumors and ossifying jaw fibromas and may ultimately enable the development of new diagnostic and treatment strategies. PUBLIC HEALTH RELEVANCE: This research will examine important molecular mechanisms causing hyperparathyroidism, a common human endocrine disorder, and ossifying fibroma, a type of non-cancerous bone tumor, through the study of the Hrpt2 gene. Individuals with an abnormal copy of HRPT2 may develop one or more cancerous or non-cancerous tumors in the parathyroid glands, jaws, uterus and/or kidneys over the course of their lifetime. This research will help us to understand how changes in the HRPT2 gene cause cancer, will allow for insight into the progression from a benign (non-cancerous) tumor to a malignant cancer, capable of spreading into other parts of the body, and also to test cancer-preventative strategies and treatment interventions that may ultimately be beneficial to human patients suffering from a wide variety of cancer types.

描述（由申请人提供）：甲状旁腺增生性颌骨肿瘤综合征（HPT-JT）是一种综合征，易使个体发生一种或多种良性或恶性甲状旁腺肿瘤、下颌骨和/或上颌骨骨化性纤维瘤、良性或恶性子宫肿瘤，以及较不常见的囊性肾病变、肾错构瘤或Wilm肿瘤。受影响的个体可能在其一生中发展多个原发性甲状旁腺，颌骨，子宫和/或肾脏肿瘤。编码parafibromin的HRPT 2肿瘤抑制基因（也称为CDC 73）的失活突变被确定为大多数受影响的激酶中HPT-JT的遗传原因。随后，散发性甲状旁腺癌，骨化性纤维瘤的下颌骨和肾肿瘤的屏幕显示两个生殖细胞和体细胞突变的HRPT 2。拟定的研究旨在解决在完整动物的病理生理学相关实验背景下，Hrpt 2/副纤维蛋白缺失促进甲状旁腺和颌骨肿瘤形成的机制。为了研究体外敲除Hrpt 2的病理生理学后果，已经产生了其中Hrpt 2基因侧接两个loxP位点的遗传工程小鼠，并将其与两种不同的转基因小鼠品系PTH-Cre和Wnt 1-Cre杂交。这些杂交将导致后代在甲状旁腺或下颌骨中分别具有Hrpt 2缺失。这两种小鼠模型的开发将为解剖HPT-JT、散发性甲状旁腺肿瘤和骨化性颌骨纤维瘤的分子基础提供一种手段，并最终能够开发新的诊断和治疗策略。 公共卫生关系：本研究将通过对Hrpt 2基因的研究，探讨引起甲状旁腺功能亢进（一种常见的人类内分泌疾病）和骨化性纤维瘤（一种非癌性骨肿瘤）的重要分子机制。HRPT 2拷贝异常的个体可能在其一生中在甲状旁腺、颌、子宫和/或肾脏中发展一种或多种癌性或非癌性肿瘤。这项研究将帮助我们了解HRPT 2基因的变化如何导致癌症，将允许深入了解从良性（非癌性）肿瘤到恶性癌症的进展，能够扩散到身体的其他部位，并测试癌症预防策略和治疗干预措施，最终可能有益于患有各种癌症类型的人类患者。