Aging, physical activity, insulin-like growth factor I, and body composition in Guatemalan women

Porch, J; Jain, Kalpana; Reilly, Austin M.; Valdez, C; Mazariegos, Manolo; Ziegler, Thomas R.; Solomons, Noel W.; Smith, Robert J.

doi:10.1093/ajcn/66.4.874

Cited by 12 publications

(5 citation statements)

References 37 publications

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“…This would be another indication that the growth factors are involved in pubertal growth. Our observations of the age-and gender-associated variation in levels of IGFs and IGFBP-3 were consistent with the findings in the literature (21,(25)(26)(27)(28)(29)(30)(31). However, there were few publications describing the normal reference ranges of IGFBP-2, IGFBP-6, and ALS (32)(33)(34).…”

Section: Discussionsupporting

confidence: 91%

Insulin-like growth factors (IGF-I, free IGF-I, and IGF-II) and insulin-like growth factor binding proteins (IGFBP-2, IGFBP-3, IGFBP-6, and ALS) in blood circulation

Mistry

Nicar

et al. 1999

J. Clin. Lab. Anal.

152

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Insulin‐like growth factors (IGFs) and IGF binding proteins (IGFBPs) play an important role in cell growth and differentiation. Clinical and epidemiological studies have indicated that measuring IGFs and IGFBPs in blood has potential implications in assessing growth‐related abnormalities and risks of certain types of cancer. To facilitate the application, we reported a large collection of reference ranges of IGFs and IGFBPs in normal population and evaluations of these molecules in serum and plasma as well as the impact of freeze‐thaw cycles on the measurement. IGF‐I, IGFBP‐3 and ALS showed a similar pattern of change associated with age. Levels of these molecules were low at birth and increased with age through puberty. After puberty the levels declined slowly with age. Overall, IGF‐I, IGFBP‐3 and ALS were slightly higher in females than in males. Free IGF‐I accounted for about 1% of the total IGF‐I and its variation with age was similar to total IGF‐I. IGF‐II levels were also increased with age from birth to puberty, but became stable after puberty. There was little difference in IGF‐II levels between genders. IGFBP‐2 levels declined with age from birth to puberty. Levels of IGFBP‐6 in contrast were increased with age. These IGF binding proteins were higher in males than in females. IGFs, IGFBP‐3 and ALS were 5‐10% higher in serum than in plasma. IGFBP‐2 and IGFBP‐6 differed substantially between serum and plasma. Freeze‐thaw treatment up to five cycles had little impact on plasma levels of IGFs and IGFBP‐3. Our observations suggest that levels of IGFs and their binding proteins are varied with age, gender, and types of specimen and that these variations need to be taken into consideration when IGFs and their binding proteins are utilized in clinic and research. J. Clin. Lab. Anal. 13:166–172, 1999. © 1999 Wiley‐Liss, Inc.

show abstract

Section: Discussionsupporting

confidence: 91%

Insulin-like growth factors (IGF-I, free IGF-I, and IGF-II) and insulin-like growth factor binding proteins (IGFBP-2, IGFBP-3, IGFBP-6, and ALS) in blood circulation

Mistry

Nicar

et al. 1999

J. Clin. Lab. Anal.

152

View full text Add to dashboard Cite

show abstract

Section: Discussionsupporting

confidence: 91%

Insulin‐like growth factors (IGF‐I, free IGF‐I, and IGF‐II) and insulin‐like growth factor binding proteins (IGFBP‐2, IGFBP‐3, IGFBP‐6, and ALS) in blood circulation

Mistry

Nicar

et al. 1999

J. Clin. Lab. Anal.

View full text Add to dashboard Cite

Insulin-like growth factors (IGFs) and IGF binding proteins (IGFBPs) play an important role in cell growth and differentiation. Clinical and epidemiological studies have indicated that measuring IGFs and IGFBPs in blood has potential implications in assessing growth-related abnormalities and risks of certain types of cancer. To facilitate the application, we reported a large collection of reference ranges of IGFs and IGFBPs in normal population and evaluations of these molecules in serum and plasma as well as the impact of freeze-thaw cycles on the measurement. IGF-I, IGFBP-3 andALS showed a similar pattern of change associated with age. Levels of these molecules were low at birth and increased with age through puberty. After puberty the levels declined slowly with age. Overall, IGF-I, IGFBP-3 and ALS were slightly higher in females than in males. Free IGF-I accounted for about 1% of the total IGF-I and its variation with age was similar to total IGF-I. IGF-II levels were also increased with age from birth to puberty, but became stable after puberty. There was little difference in IGF-II levels between genders. IGFBP-2 levels declined with age from birth to puberty. Levels of IGFBP-6 in contrast were increased with age. These IGF binding proteins were higher in males than in females. IGFs, IGFBP-3 and ALS were 5-10% higher in serum than in plasma. IGFBP-2 and IGFBP-6 differed substantially between serum and plasma. Freeze-thaw treatment up to five cycles had little impact on plasma levels of IGFs and IGFBP-3. Our observations suggest that levels of IGFs and their binding proteins are varied with age, gender, and types of specimen and that these variations need to be taken into consideration when IGFs and their binding proteins are utilized in clinic and research.

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“…Previous studies of PA and IGF-I have been inconsistent. Two randomized control trials and seven cross-sectional analyses identified no relationships between PA and either IGF-I or IGFBP-3 levels among premenopausal [30,45] or postmenopausal women [46][47][48][49] or among women in general [11,50,51]. However, only three of the cross-sectional studies above [11,30,47] included more than 400 subjects.…”

Section: Discussionmentioning

confidence: 99%

Cancer risk factors associated with insulin-like growth factor (IGF)-I and IGF-binding protein-3 levels in healthy women: effect modification by menopausal status

Barnes

Chang‐Claude

Flesch-Janys

et al. 2009

Cancer Causes Control

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Insulin-like growth factor-I (IGF-I) and IGF-binding protein-3 (IGFBP-3) appear to influence breast cancer risk and are hypothesized to mediate the effects of several cancer risk factors that depend on menopausal status. We investigated associations among cancer risk factors and plasma IGF-I and IGFBP-3 in 882 healthy control women (426 premenopausal, 456 postmenopausal) from two population-based breast cancer case–control studies. Interactions with menopausal status were statistically tested. We observed associations with non-modifiable (age, benign breast disease) and modifiable factors [body mass index (BMI), physical activity, smoking habits, alcohol consumption]. Furthermore, we demonstrated statistical interactions with menopausal status. Premenopausal IGFBP-3 levels increased and postmenopausal levels decreased with age (p-interaction = 0.001). Overweight postmenopausal women had higher IGF-I (p = 0.049) and IGFBP-3 (p = 0.005) levels than women with lower BMI. Postmenopausal IGF-I levels were positively associated with physical activity (p-trend = 0.012, p-interaction = 0.050). Postmenopausal current smokers had lower IGF-I (p = 0.014) and IGFBP-3 levels (p = 0.011). Increasing alcohol consumption was associated with lower premenopausal IGF-I (p-trend = 0.002, p-interaction = 0.004) and higher postmenopausal IGFBP-3 levels (p = 0.019). Benign breast disease was associated with higher premenopausal (p = 0.044) and postmenopausal (p = 0.002) IGF-I levels. IGF-I and/or IGFBP-3 potentially mediate changes in breast cancer risk associated with BMI, benign breast disease, and perhaps alcohol consumption. Other observed associations suggest that neither IGF-I nor IGFBP-3 alone acts as mediator. Consideration of menopausal status may help disentangle carcinogenic pathways involving IGF proteins.

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Aging, physical activity, insulin-like growth factor I, and body composition in Guatemalan women

Cited by 12 publications

References 37 publications

Insulin-like growth factors (IGF-I, free IGF-I, and IGF-II) and insulin-like growth factor binding proteins (IGFBP-2, IGFBP-3, IGFBP-6, and ALS) in blood circulation

Insulin-like growth factors (IGF-I, free IGF-I, and IGF-II) and insulin-like growth factor binding proteins (IGFBP-2, IGFBP-3, IGFBP-6, and ALS) in blood circulation

Insulin‐like growth factors (IGF‐I, free IGF‐I, and IGF‐II) and insulin‐like growth factor binding proteins (IGFBP‐2, IGFBP‐3, IGFBP‐6, and ALS) in blood circulation

Cancer risk factors associated with insulin-like growth factor (IGF)-I and IGF-binding protein-3 levels in healthy women: effect modification by menopausal status

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