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Cohort Study on Associations Between Purinergic Receptor SNPs and Osteoporosis Risk (ATPBone)

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ClinicalTrials.gov Identifier: NCT00697983
Recruitment Status : Completed
First Posted : June 16, 2008
Last Update Posted : April 20, 2011
Information provided by:

Study Description
Brief Summary:

Background: Osteoporosis is a high-prevalence disease with a strong genetic component. Nucleotides, including ATP (adenosine 5'-triphosphate) and its purinergic receptors, play a role in bone physiology. Single nucleotide polymorphisms (SNPs) in the P2X7 receptor gene were recently found to be associated with fracture risk in a cohort of postmenopausal women.

Objective: To investigate associations between purinergic receptor SNPs and osteoporosis risk in humans. Genetic data from a fracture cohort in the Netherlands with high prevalence of osteoporosis will be analyzed. Furthermore, effects of aberrant purinergic receptor signalling on bone turnover markers will be assessed ex vivo.

Design: The cohort will include app. 1,000 fracture patients of 50 years and older, who will be recruited at the Maastricht University Medical Center during standard medical follow-up after a clinical fracture. The standard medical follow-up includes assessment of bone mineral density (BMD) by Dual-Energy X-ray Absorptiometry (DXA), if necessary followed by medication for osteoporosis. Prior to medication, blood samples will be collected from fracture patients to be genotyped for purinergic receptor SNPs and analyzed for biochemical markers of bone turnover. Systemic correlates of osteoporosis will be compared between osteoporotic subjects (i.e. low BMD) and non-osteoporotic controls (i.e. normal to high BMD). Subsequently, whole blood assays in patient subgroups (n=20 per subgroup), based on BMD and purinergic receptor SNPs, will be performed to evaluate ex vivo effects of ATP and related nucleotides bone markers.

Study population: Patients of 50 years and older attending an outpatient osteoporosis clinic at the Maastricht University Medical Center for standard medical follow-up after a clinical, non-pathological fracture.

Primary outcome parameters: BMD and purinergic receptor SNPs.

Secondary outcome parameters: Bone markers.

Condition or disease

Study Design

Study Type : Observational
Estimated Enrollment : 1000 participants
Observational Model: Cohort
Time Perspective: Cross-Sectional
Official Title: Purinergic Signalling in Human Osteoporosis: Evaluation of Variability in Purinergic Receptor Genes and Receptor Function
Study Start Date : August 2008
Primary Completion Date : December 2009
Study Completion Date : December 2010

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Osteoporosis
U.S. FDA Resources

Groups and Cohorts

Fracture cohort
Patients of 50 years and above with a clinical, non-pathological fracture, who attend an osteoporosis outpatient clinic at the Maastricht University Medical Center for standard medical care (including bone densitometry by DXA-scan).

Outcome Measures

Primary Outcome Measures :
  1. Purinergic receptor SNPs [ Time Frame: cross-sectional ]
  2. BMD [ Time Frame: cross-sectional ]

Secondary Outcome Measures :
  1. Biochemical markers of bone turnover [ Time Frame: cross-sectional ]

Biospecimen Retention:   Samples With DNA
Whole blood, serum, plasma

Eligibility Criteria

Information from the National Library of Medicine

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Ages Eligible for Study:   50 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
Fracture patients of 50 years and older attending an osteoporosis outpatient clinic at the Maastricht University Medical Center

Inclusion Criteria:

  • Age 50 years and older;
  • Clinical fracture;
  • Attending osteoporosis outpatient clinic for standard medical care.

Exclusion Criteria:

  • Disease of bone metabolism (e.g. bone tumours, hyperparathyroidism);
  • Unwillingness to donate blood for DNA analyses;
  • Failure of bone densitometry (DXA-scan).
Contacts and Locations

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00697983

Maastricht University Medical Center
Maastricht, Limburg, Netherlands
Sponsors and Collaborators
Maastricht University Medical Center
Copenhagen University Hospital, Research Center for Aging and Osteoporosis
European Commission
Principal Investigator: Pieter C Dagnelie, PhD Maastricht University, Dept of Epidemiology
More Information

Additional Information:
Responsible Party: dr. ir. P.C. Dagnelie, Maastricht University Medical Center
ClinicalTrials.gov Identifier: NCT00697983     History of Changes
Other Study ID Numbers: MEC 08-3-029
EU FP7, grant no. 202231
First Posted: June 16, 2008    Key Record Dates
Last Update Posted: April 20, 2011
Last Verified: April 2011

Keywords provided by Maastricht University Medical Center:
Purinergic receptors
Bone mineral density
Single nucleotide polymorphism

Additional relevant MeSH terms:
Bone Diseases, Metabolic
Bone Diseases
Musculoskeletal Diseases
Metabolic Diseases