Insulin-like growth factor-I and insulin-like growth factor binding protein-3 in Alzheimer's disease. Duron, E., Funalot, B., Brunel, N., Coste, J., Quinquis, L., Viollet, C., Belmin, J., Jouanny, P., Pasquier, F., Treluyer, J., Epelbaum, J., le Bouc, Y., & Hanon, O. The Journal of Clinical Endocrinology and Metabolism, 97(12):4673–4681, December, 2012.
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CONTEXT: Few large studies have been conducted to assess the relationship between circulating IGF and late-life cognition. OBJECTIVE: The aim of the study was to assess the relationship between IGF-I and IGF binding protein-3 (IGFBP-3) serum levels and cognitive impairment, including Alzheimer's disease (AD). METHODS: In this multicentric cross-sectional study, 694 elderly subjects (218 men, 476 women; 78.6 ± 6.7 yr old) were included; 481 had memory complaints and were diagnosed, after comprehensive cognitive assessment, with AD (n = 224) or mild cognitive impairment (MCI) (n = 257). The control group was comprised of 213 subjects without memory complaint and with normal cognition (recruited among patients' caregivers). IGF-I and IGFBP-3 serum levels were determined by ELISA. RESULTS: IGF-I and IGFBP-3 serum levels were significantly associated with cognitive status in men (IGF-I, 137 ± 69 ng/ml for AD vs. 178 ± 88 ng/ml for MCI and 172 ± 91 ng/ml for controls, P = 0.01; IGFBP-3, 3675 ± 1542 ng/ml for AD vs. 4143 ± 1828 ng/ml for MCI and 4488 ± 1893 ng/ml for controls, P = 0.04). In women, IGFBP-3 was significantly associated with cognitive status (3781 ± 1351 ng/ml for AD vs. 4190 ± 1408 ng/ml for MCI and 4390 ± 1552 ng/ml for controls; P \textless 0.001), but no significant differences between groups for IGF-I occurred. After adjustment for confounding variables (age, educational level, body mass index, diabetes, apolipoprotein E ε4 status), logistic regression indicated that IGF-I [odds ratio (95% confidence interval) = 0.48 (0.26-0.88)] and IGFBP-3 [odds ratio (95% confidence interval) = 0.71 (0.52-0.97)] serum levels were independently associated with AD in men, but not in women. CONCLUSIONS: We report a significant association between low IGF-I and IGFBP-3 serum levels and AD in men, but not in women.
@article{duron_insulin-like_2012,
	title = {Insulin-like growth factor-{I} and insulin-like growth factor binding protein-3 in {Alzheimer}'s disease},
	volume = {97},
	issn = {1945-7197},
	doi = {10.1210/jc.2012-2063},
	abstract = {CONTEXT: Few large studies have been conducted to assess the relationship between circulating IGF and late-life cognition.
OBJECTIVE: The aim of the study was to assess the relationship between IGF-I and IGF binding protein-3 (IGFBP-3) serum levels and cognitive impairment, including Alzheimer's disease (AD).
METHODS: In this multicentric cross-sectional study, 694 elderly subjects (218 men, 476 women; 78.6 ± 6.7 yr old) were included; 481 had memory complaints and were diagnosed, after comprehensive cognitive assessment, with AD (n = 224) or mild cognitive impairment (MCI) (n = 257). The control group was comprised of 213 subjects without memory complaint and with normal cognition (recruited among patients' caregivers). IGF-I and IGFBP-3 serum levels were determined by ELISA.
RESULTS: IGF-I and IGFBP-3 serum levels were significantly associated with cognitive status in men (IGF-I, 137 ± 69 ng/ml for AD vs. 178 ± 88 ng/ml for MCI and 172 ± 91 ng/ml for controls, P = 0.01; IGFBP-3, 3675 ± 1542 ng/ml for AD vs. 4143 ± 1828 ng/ml for MCI and 4488 ± 1893 ng/ml for controls, P = 0.04). In women, IGFBP-3 was significantly associated with cognitive status (3781 ± 1351 ng/ml for AD vs. 4190 ± 1408 ng/ml for MCI and 4390 ± 1552 ng/ml for controls; P {\textless} 0.001), but no significant differences between groups for IGF-I occurred. After adjustment for confounding variables (age, educational level, body mass index, diabetes, apolipoprotein E ε4 status), logistic regression indicated that IGF-I [odds ratio (95\% confidence interval) = 0.48 (0.26-0.88)] and IGFBP-3 [odds ratio (95\% confidence interval) = 0.71 (0.52-0.97)] serum levels were independently associated with AD in men, but not in women.
CONCLUSIONS: We report a significant association between low IGF-I and IGFBP-3 serum levels and AD in men, but not in women.},
	language = {eng},
	number = {12},
	journal = {The Journal of Clinical Endocrinology and Metabolism},
	author = {Duron, Emmanuelle and Funalot, Benoît and Brunel, Nadège and Coste, Joel and Quinquis, Laurent and Viollet, Cécile and Belmin, Joel and Jouanny, Pierre and Pasquier, Florence and Treluyer, Jean-Marc and Epelbaum, Jacques and le Bouc, Yves and Hanon, Olivier},
	month = dec,
	year = {2012},
	pmid = {23015654},
	keywords = {Aged, Alzheimer Disease, Humans, Cognition, Female, Male, Neuropsychological Tests, Cross-Sectional Studies, Aged, 80 and over, Apolipoproteins E, Genotype, Memory, Insulin-Like Growth Factor Binding Protein 3, Insulin-Like Growth Factor I},
	pages = {4673--4681}
}

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