Abstract:
OBJECTIVE:Giant cell (temporal) arteritis (GCA) and polymyalgia rheumatica (PMR) are different but overlapping diseases of unknown etiology affecting the elderly. Corticotropin-releasing hormone (CRH) helps to regulate the immune response and maintain homeostasis during inflammatory stress. CRH promoter region polymorphisms in the 5'regulatory region of the CRH gene have been described. To investigate the possible implications of the CRH promoter polymorphisms in PMR and GCA susceptibility we have examined a series of patients with these conditions. METHODS:Sixty-two patients with biopsy-proven GCA, 86 patients with isolated PMR and 147 ethnically matched controls from the Lugo region of Northwest Spain were included in this study. Patients and controls were genotyped for CRH polymorphism in the 5' regulatory region of the gene at position 1273 (alleles A1 andA2) and at position 225 (alleles B1 and B2) by PCR-restriction fragment length polymorphism. Allele frequencies and genotype distribution were evaluated by the chi-square test. RESULTS:When GCA and PMR patients were examined for alleles and genotypes for each CRH polymorphism no significant differences in frequency were found compared with controls. A higher CRH-A2 allele frequency was observed in GCA patients with visual complications (21.4%) compared with controls (9.2%) and GCA cases without eye involvement [6.3%; p= 0.017, Pcorr = 0.034, O.R: 4.1 (95% CI 1.2- 13.9)], although this was based on a small sample of patients with ischemic visual complications (n = 14) and should be interpreted with caution. No differences in CRH allele or genotype frequencies were observed in isolated PMR patients stratified by relapses and recurrence of disease symptoms. CONCLUSION:Polymorphisms in the CRH gene regulatory region do not appear to be associated with increased susceptibility to PMR or GCA. The CRH-A2 allele may encode risk for the development of visual complications in GCA, although further studies to confirm this will be required.
journal_name
Clin Exp Rheumatoljournal_title
Clinical and experimental rheumatologyauthors
Gonzalez-Gay MA,Hajeer AH,Dababneh A,Garcia-Porrua C,Amoli MM,Thomson W,Ollier WEkeywords:
subject
Has Abstractpub_date
2002-03-01 00:00:00pages
133-8issue
2eissn
0392-856Xissn
1593-098Xjournal_volume
20pub_type
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journal_title:Clinical and experimental rheumatology
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