Studies on Abnormal Bone From Patients With Polyostotic Fibrous Dysplasia and McCune Albright Syndrome

Studies on Tissues From Patients With Fibrous Dysplasia of Bone/McCune-Albright Syndrome and Other Disorders of Calcified Tissues

This study will investigate how a gene mutation (change in DNA) causes the abnormal bone in fibrous dysplasia-a condition in which areas of normal bone are replaced with a fibrous growth similar to a scar. The bone abnormalities in fibrous dysplasia can occur in a single bone (monostotic fibrous dysplasia), multiple bones (polyostotic fibrous dysplasia), or in McCune Albright syndrome, in which there are associated glandular abnormalities. This study will also examine calcinosis samples that have been surgically removed from patients with juvenile dermatomyositis.

Patients who are scheduled to have orthopedic surgery for treatment of polyostotic fibrous dysplasia may participate in this study. A small sample of bone tissue removed during surgery will be given to investigators in this study for research tests. DNA will be extracted from the tissue and tested for the mutation. Investigators will attempt to grow cells from the sample in the laboratory to evaluate them for their ability to grow and make proteins that normal bone cells make. These tests are designed to help scientists understand how the mutation leads to abnormal bone formation and provide information that might lead to better treatments for fibrous dysplasia. Patients with juvenile Dermatomyositis who have a calcinosis sample surgically removed are also eligible for participation. The removed tissues will be examined for their composition and microscopic appearance, to better understand the pathogenesis of dystrophic calcification in this disease.

Study Overview

• Status: Completed
• Conditions: Polyostotic Fibrous Dysplasia

Detailed Description

Polyostotic fibrous dysplasia (PFD) is a sporadic disorder in which multiple sites of bone are replaced by abnormal fibrous tissue. PFD may occur alone or as part of the McCune Albright syndrome (MAS). We have previously identified a somatic activating mutation in the gene encoding the alpha-subunit of Gs, the G protein which mediates the action of hormones that work by increasing intracellular levels of cyclic adenosine monophosphate (cAMP), in affected tissues from patients with PFD and MAS. The objectives of this study are to determine how activating mutations of the Gs alpha-subunit lead to the changes of PFD, and to determine if interventions that block the biochemical effects of the activating mutation in in vitro and in vivo animal model systems could prevent some of the cellular changes characteristic of PFD. To carry out these studies, we plan to obtain pathologic bone tissue from patients with either isolated PFD or PFD in the context of MAS. In one phase of the study, archival pathology specimens of affected bone will be retrospectively analyzed using a variety of immunohistochemical techniques. In the second phase of the study, specimens of affected bone will be obtained prospectively from patients undergoing clinically indicated orthopedic procedures. Specimens will be placed in primary culture, cultured cells will be analyzed for the Gs alpha-subunit activating mutation, and the mutant-bearing cells will be studied by a variety of cell biologic and pharmacologic techniques.

• Study Type: Observational

Contacts and Locations

Study Locations

• United States
  • Maryland
    • Bethesda, Maryland, United States, 20892
      • National Institutes of Health Clinical Center, 9000 Rockville Pike

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Child; Adult; Older Adult
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

• INCLUSION CRITERIA:

All patients who are scheduled to have orthopedic surgery for treatment of polyostotic fibrous dysplasia (PFD).

Tissue will only be obtained from those patients in whom the procedure is clinically indicated for standard reasons such as treatment of or prevention of fractures, or disfigurement resulting from abnormal growth of facial and/ or skull bones.

The diagnosis of PFD will have been established by standard radiologic criteria and in patients with McCune Albright syndrome (MAS), also by the characteristic skin and endocrine manifestations associated with that form of the disease.

Patients meeting criteria for juvenile dermatomyositis who undergo surgical removal of calcinosis are eligible. The tissue from surgery would be used in the research study.

Study Plan

How is the study designed?

Collaborators and Investigators

• Sponsor: National Institute of Dental and Craniofacial Research (NIDCR)

Study record dates

Study Major Dates

• Study Start: December 18, 1996
• Study Completion: December 12, 2008

Study Registration Dates

• First Submitted: January 18, 2000
• First Submitted That Met QC Criteria: January 18, 2000
• First Posted (Estimate): January 19, 2000

Study Record Updates

• Last Update Posted (Actual): July 2, 2017
• Last Update Submitted That Met QC Criteria: June 30, 2017
• Last Verified: December 12, 2008

More Information

Terms related to this study

• Keywords: Immunohistochemistry; PCR; Mutation; McCune-Albright Syndrome; Pathology; In Situ Hybridization; Calcinosis; Juvenile Dermatomyositis; Fibrous Dysplasia; G Protein Mutation
• Additional Relevant MeSH Terms: Pathologic Processes; Musculoskeletal Diseases; Bone Diseases; Bone Diseases, Developmental; Osteochondrodysplasias; Hyperplasia; Fibrous Dysplasia of Bone; Fibrous Dysplasia, Polyostotic
• Other Study ID Numbers: 970055; 97-D-0055