Ignite Creation Date:
2025-12-25 @ 1:03 AM
Ignite Modification Date:
2025-12-30 @ 5:54 PM
Study NCT ID:
NCT00498693
Status:
UNKNOWN
Last Update Posted:
2009-01-14
First Post:
2007-07-08
Is NOT Gene Therapy:
True
Has Adverse Events:
False
Brief Title:
Hypoxia Inducible factor1-Alpha Genetic Polymorphism of Obstructive Sleep Apnea
Sponsor:
Organization:
Raw JSON
{'hasResults': False, 'derivedSection': {'miscInfoModule': {'versionHolder': '2025-12-24'}, 'conditionBrowseModule': {'meshes': [{'id': 'D020181', 'term': 'Sleep Apnea, Obstructive'}], 'ancestors': [{'id': 'D012891', 'term': 'Sleep Apnea Syndromes'}, {'id': 'D001049', 'term': 'Apnea'}, {'id': 'D012120', 'term': 'Respiration Disorders'}, {'id': 'D012140', 'term': 'Respiratory Tract Diseases'}, {'id': 'D020919', 'term': 'Sleep Disorders, Intrinsic'}, {'id': 'D020920', 'term': 'Dyssomnias'}, {'id': 'D012893', 'term': 'Sleep Wake Disorders'}, {'id': 'D009422', 'term': 'Nervous System Diseases'}]}}, 'protocolSection': {'designModule': {'studyType': 'OBSERVATIONAL', 'designInfo': {'timePerspective': 'PROSPECTIVE', 'observationalModel': 'CASE_CONTROL'}, 'enrollmentInfo': {'type': 'ESTIMATED', 'count': 1000}}, 'statusModule': {'overallStatus': 'UNKNOWN', 'lastKnownStatus': 'RECRUITING', 'startDateStruct': {'date': '2006-03'}, 'expandedAccessInfo': {'hasExpandedAccess': False}, 'statusVerifiedDate': '2009-01', 'lastUpdateSubmitDate': '2009-01-12', 'studyFirstSubmitDate': '2007-07-08', 'studyFirstSubmitQcDate': '2007-07-08', 'lastUpdatePostDateStruct': {'date': '2009-01-14', 'type': 'ESTIMATED'}, 'studyFirstPostDateStruct': {'date': '2007-07-10', 'type': 'ESTIMATED'}}, 'oversightModule': {'oversightHasDmc': True}, 'conditionsModule': {'conditions': ['Sleep Apnea, Obstructive']}, 'referencesModule': {'references': [{'pmid': '18583924', 'type': 'DERIVED', 'citation': 'Pandit JJ. Structure-function relationships: a breath of fresh air--or just more hot air--in sleep apnoea research? Respiration. 2008;76(1):16-8. doi: 10.1159/000127578. Epub 2008 May 8. No abstract available.'}]}, 'descriptionModule': {'briefSummary': 'Specific Aim\n\n1. To identify specific SNPs of HIF-1 gene related to cardiovascular disease in OSA patients (CVD-OSA)\n2. To assay the functional activity of high risk SNPs of HIF-1 on the transcription of VEGF gene\n3. To confirm that the serum level of VEGF in CVD-OSA patients with high risk SNPs of HIF-1 are higher than CVD-OSA patients without', 'detailedDescription': 'Obstructive sleep apnea syndrome(OSAS) is characterized with recurrent collapse of upper airway during sleep and results in hypoxia and sleep fragmentation. The repeated episodes of hypoxia and sympathetic hyperactivity result in cardiovascular complications, including atherosclerosis, hypertension, coronary artery disease and heart failure. Our data showed among 309 consecutively-admitted OSA patients, 54% patients had cardiovascular diseases.\n\nThe hypoxia in OSA is characterized as chronic and intermittent, which leads to sophisticated adaptive mechanisms, like activations of transcriptional factors and critical signaling pathways. HIF-1 is a central component of transcriptional factors involved in hypoxia-induced transcription of specific genes. There are two subunits of HIF-1 transcription factor, which interact with the consensus hypoxia response element in the target genes. The HIF-1 alpha activity is regulated by proline hydroxylation modification and ubiquitination, which is oxygen-tension dependent. HIF-1 alpha target genes encode proteins that increase oxygen delivery, such as vascular endothelial growth factor(VEGF). Our oligo-microarray study showed both HIF and VEGF expression in OSA patients was 1.3 times of control group, which decreased to 46% and 57% respectively after one-month CPAP treatment.\n\nHIF-1 alpha polymorphism could result in increased HIF-1 alpha activity and microvessel density. In clinical observation, HIF-1 polymorphism has been reported to be associated with high altitude adaptation, formation of coronary collaterals in CAD and phenotype of cancer. These findings were possibly explained with effect of HIF on modulation of VEGF.\n\nSeveral genetic polymorphisms were reported to be associated with OSA, which included TNF alpha, angiotensin converting enzyme and haptoglobin. Only hepatoglobin phenotype is proved to be a risk factor for cardiovascular disease in OSA. In most studies, the patient number is less than suggested.\n\nTherefore, in this study, we hypothesized that HIF-1 gene polymorphism was associated with cardiovascular disease in OSA. And by using large-scale of study population(1000 OSA patients), we examined all regions of the HIF-1 alpha to detect single-nucleotide polymorphisms(SNPs), evaluated the pattern of linkage disequilibrium to compose haplotypes in the gene, and performed association studies in OSA patients with and without cardiovascular disease to achieve the following 3 objectives:(1)To identify specific SNPs of HIF-1 alpha gene related to cardiovascular disease in OSA patients (CVD-OSA).(2)To assay the functional activity of high risk SNPs of HIF-1 alpha on the transcription of VEGF gene.(3)To confirm that the serum level of VEGF in CVD-OSA patients with high risk SNPs of HIF-1 are higher than CVD-OSA patients without. The findings are expected to stratify the risk of OSA patients to specific outcome, or response to specific therapy.'}, 'eligibilityModule': {'sex': 'ALL', 'stdAges': ['ADULT', 'OLDER_ADULT'], 'minimumAge': '18 Years', 'samplingMethod': 'PROBABILITY_SAMPLE', 'studyPopulation': 'patients referred sleep center to rule out obstructive sleep apnea', 'healthyVolunteers': False, 'eligibilityCriteria': 'Inclusion Criteria:\n\n* Severe obstructive sleep apnea (AHI\\>=30/hr) age, sex, BMI match control subject\n\nExclusion Criteria:\n\n* Patients were excluded when: (1) refused to participate in this study, (2) had severe obstructive pulmonary disease or active neurological events, (3) enrolled in other studies at the same time'}, 'identificationModule': {'nctId': 'NCT00498693', 'briefTitle': 'Hypoxia Inducible factor1-Alpha Genetic Polymorphism of Obstructive Sleep Apnea', 'organization': {'class': 'OTHER', 'fullName': 'National Taiwan University Hospital'}, 'orgStudyIdInfo': {'id': '9561701013'}}, 'contactsLocationsModule': {'locations': [{'city': 'Taipei', 'status': 'RECRUITING', 'country': 'Taiwan', 'contacts': [{'name': 'Peilin Lee, M.D.', 'role': 'CONTACT', 'email': 'peilin1986@yahoo.com.tw', 'phone': '+886-2-23562905'}, {'name': 'Peilin Lee, M.D.', 'role': 'SUB_INVESTIGATOR'}], 'facility': 'National Taiwan Univeristy Hospital', 'geoPoint': {'lat': 25.05306, 'lon': 121.52639}}], 'centralContacts': [{'name': 'Peilin Lee, M.D.', 'role': 'CONTACT', 'email': 'peilin1986@yahoo.com.tw', 'phone': '+886-2-23562905'}], 'overallOfficials': [{'name': 'Hey-Dong Wu, M.D.', 'role': 'PRINCIPAL_INVESTIGATOR', 'affiliation': 'National Taiwan University Hospital'}]}, 'sponsorCollaboratorsModule': {'leadSponsor': {'name': 'National Taiwan University Hospital', 'class': 'OTHER'}, 'responsibleParty': {'oldNameTitle': 'Peilin Lee', 'oldOrganization': 'National Taiwan University Hospital'}}}}