title: Interleukin-1RN gene polymorphisms in elderly patients with rheumatic inflammatory chronic conditions: Association of IL-1RN*2/2 genotype with polymyalgia rheumatica.
abstract: The objective of this study was to investigate whether there is an association between IL1RN polymorphism and disease susceptibility for three age-related inflammatory conditions: polymyalgia rheumatica (PMR), giant cell arteritis (GCA), and elderly-onset rheumatoid arthritis (EORA). A tandem-repeat polymorphism within IL1RN intron 2 was analyzed in 139 PMR, 69 GCA, and 156 RA patients (75 with EORA) as well as in 437 healthy subjects, together with the in vitro production of IL-1beta. Our results showed that the IL1RN*2/2 genotype was more frequent in PMR patients compared with controls (p = 0.032, odds ratio = 1.785, 95% confidence interval = 1.047-3.044) and GCA patients (p = 0.008, odds ratio = 4.661, 95% confidence interval = 1.352-16.065). We found no difference in the distribution of genotypes between PMR and EORA or between EORA and controls. However, the frequency of the IL-1RN*2/2 genotype had a tendency to be higher in patients with EORA compared with young onset RA. The presence of IL1RN*1 or IL1RN*2 allele was not associated with severity of the disease in PMR and GCA patients and did not influence the production of IL-1beta. In conclusion, the IL1RN*2 polymorphism in a homozygous state was associated with an increased susceptibility to PMR and may give some clues for a differential therapy with GCA.
authors.affiliation: Hospital Universitario Marqués de Valdecilla, Universidad de Cantabria, Santander, Fundación Marqués de Valdecilla-Instituto de Formación e Investigación Margués de Valdecilla, Spain.
authors.forename: Lorena
authors.initials: L
authors.lastname: Alvarez-Rodriguez
authors.forename: Eugenio
authors.initials: E
authors.lastname: Carrasco-Marin
authors.forename: Marcos
authors.initials: M
authors.lastname: Lopez-Hoyos
authors.forename: Cristina
authors.initials: C
authors.lastname: Mata
authors.forename: Lorena
authors.initials: L
authors.lastname: Fernandez-Prieto
authors.forename: Maria
authors.initials: M
authors.lastname: Ruiz-Soto
authors.forename: Jaime
authors.initials: J
authors.lastname: Calvo
authors.forename: Vicente
authors.initials: V
authors.lastname: Rodriguez-Valverde
authors.forename: Teresa
authors.initials: T
authors.lastname: Ruiz
authors.forename: Ricardo
authors.initials: R
authors.lastname: Blanco
authors.forename: Alfonso
authors.initials: A
authors.lastname: Corrales
authors.forename: Victor Manuel
authors.initials: VM
authors.lastname: Martinez-Taboada
mesh_terms: D000368:Aged; D000375:Aging / Q000502:physiology*; D001172:Arthritis, Rheumatoid / Q000235:genetics*; D002908:Chronic Disease; D005260:Female; D020022:Genetic Predisposition to Disease; D005838:Genotype; D013700:Giant Cell Arteritis / Q000235:genetics*; D006720:Homozygote; D006801:Humans; D053590:Interleukin 1 Receptor Antagonist Protein / Q000235:genetics*; D053583:Interleukin-1beta / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D011110:Polymorphism, Genetic; D011111:Polymyalgia Rheumatica / Q000235:genetics*
chemical_list: C507763:IL1RN protein, human; D053590:Interleukin 1 Receptor Antagonist Protein; D053583:Interleukin-1beta