Abstract:
BACKGROUND:An attenuation of the insulin-like growth factor 1 (IGF-1) signaling has been associated with elongation of the lifespan in simple metazoan organisms and in rodents. In humans, IGF-1 level has an age-related modulation with a lower concentration in the elderly, depending on hormonal and genetic factors affecting the IGF-1 receptor gene (IGF-1R). METHODS:In an elderly population from North-eastern Italy (n = 668 subjects, age range 70-106 years) we investigated the IGF-1R polymorphism G3174A (rs2229765) and the plasma concentration of free IGF-1. Frequency distributions were compared using chi2-test "Goodness of Fit" test, and means were compared by one-way analysis of variance (ANOVA); multiple regression analysis was performed using JMP7 for SAS software (SAS Institute, USA). The limit of significance for genetic and biochemical comparison was set at alpha = 0.05. RESULTS:Males showed an age-related increase in the A-allele of rs2229765 and a change in the plasma level of IGF-1, which dropped significantly after 85 years of age (85+ group). In the male 85+ group, A/A homozygous subjects had the lowest plasma IGF-1 level. We found no clear correlation between rs2229765 genotype and IGF-1 in the females. CONCLUSION:These findings confirm the importance of the rs2229765 minor allele as a genetic predisposing factor for longevity in Italy where a sex-specific pattern for IGF-1 attenuation with ageing was found.
journal_name
BMC Geriatrjournal_title
BMC geriatricsauthors
Albani D,Batelli S,Polito L,Vittori A,Pesaresi M,Gajo GB,De Angeli S,Zanardo A,Gallucci M,Forloni Gdoi
10.1186/1471-2318-9-19subject
Has Abstractpub_date
2009-05-21 00:00:00pages
19issn
1471-2318pii
1471-2318-9-19journal_volume
9pub_type
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