Associations of age with serum insulin, proinsulin and the proinsulin-to-insulin ratio: a cross-sectional study
Abstract Background Insulin responses and insulin levels seem to decline with age. However, the question of beta cell impairment attributable to ageing has been sparsely addressed in population-based studies. Non-fasting insulin levels are determined by the ambient degree of insulin resistance toget...
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ftbiomed:oai:biomedcentral.com:1472-6823-10-21 2023-05-15T18:34:48+02:00 Associations of age with serum insulin, proinsulin and the proinsulin-to-insulin ratio: a cross-sectional study Bryhni, Bente Arnesen, Egil Jenssen, Trond G 2010-12-16 http://www.biomedcentral.com/1472-6823/10/21 en eng BioMed Central Ltd. http://www.biomedcentral.com/1472-6823/10/21 Copyright 2010 Bryhni et al; licensee BioMed Central Ltd. Research article 2010 ftbiomed 2011-01-16T00:34:24Z Abstract Background Insulin responses and insulin levels seem to decline with age. However, the question of beta cell impairment attributable to ageing has been sparsely addressed in population-based studies. Non-fasting insulin levels are determined by the ambient degree of insulin resistance together with the capacity of beta cells to compensate by insulin secretion to prevent hyperglycaemia. A raised proinsulin-to-insulin ratio (proinsulin/insulin) due to impaired processing of proinsulin is an early marker of beta cell dysfunction. We hypothesised that in a general population, signs of beta cell failure with advancing age manifest not only by decreases in random insulin, but also with a corresponding increase in its precursor proinsulin. Methods In the Tromsø Study 1994-95 we measured insulin and proinsulin concentrations in random blood samples from 6212 persons without self-reported diabetes mellitus and plotted the levels as percentiles according to age. In regression analyses we assessed the relationships between age and insulin, proinsulin, and proinsulin/insulin, while adjusting for the concomitant measurements of glucose and other metabolic variables, and the time since the last meal. Results Median insulin concentrations declined significantly with advancing age group in men, but not in women. Proinsulin levels and proinsulin/insulin increased across age groups in both genders. After adjustment, greater age was associated with lower log 10 (insulin) and higher log 10 (proinsulin) and log 10 (proinsulin/insulin) (p = 0.0001 for all). Conclusions Negative associations of age with random insulin levels, together with positive associations of age with proinsulin and proinsulin/insulin, point towards a loss of beta cell function inherent in the ageing process. Article in Journal/Newspaper Tromsø BioMed Central Tromsø |
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Abstract Background Insulin responses and insulin levels seem to decline with age. However, the question of beta cell impairment attributable to ageing has been sparsely addressed in population-based studies. Non-fasting insulin levels are determined by the ambient degree of insulin resistance together with the capacity of beta cells to compensate by insulin secretion to prevent hyperglycaemia. A raised proinsulin-to-insulin ratio (proinsulin/insulin) due to impaired processing of proinsulin is an early marker of beta cell dysfunction. We hypothesised that in a general population, signs of beta cell failure with advancing age manifest not only by decreases in random insulin, but also with a corresponding increase in its precursor proinsulin. Methods In the Tromsø Study 1994-95 we measured insulin and proinsulin concentrations in random blood samples from 6212 persons without self-reported diabetes mellitus and plotted the levels as percentiles according to age. In regression analyses we assessed the relationships between age and insulin, proinsulin, and proinsulin/insulin, while adjusting for the concomitant measurements of glucose and other metabolic variables, and the time since the last meal. Results Median insulin concentrations declined significantly with advancing age group in men, but not in women. Proinsulin levels and proinsulin/insulin increased across age groups in both genders. After adjustment, greater age was associated with lower log 10 (insulin) and higher log 10 (proinsulin) and log 10 (proinsulin/insulin) (p = 0.0001 for all). Conclusions Negative associations of age with random insulin levels, together with positive associations of age with proinsulin and proinsulin/insulin, point towards a loss of beta cell function inherent in the ageing process. |
format |
Article in Journal/Newspaper |
author |
Bryhni, Bente Arnesen, Egil Jenssen, Trond G |
spellingShingle |
Bryhni, Bente Arnesen, Egil Jenssen, Trond G Associations of age with serum insulin, proinsulin and the proinsulin-to-insulin ratio: a cross-sectional study |
author_facet |
Bryhni, Bente Arnesen, Egil Jenssen, Trond G |
author_sort |
Bryhni, Bente |
title |
Associations of age with serum insulin, proinsulin and the proinsulin-to-insulin ratio: a cross-sectional study |
title_short |
Associations of age with serum insulin, proinsulin and the proinsulin-to-insulin ratio: a cross-sectional study |
title_full |
Associations of age with serum insulin, proinsulin and the proinsulin-to-insulin ratio: a cross-sectional study |
title_fullStr |
Associations of age with serum insulin, proinsulin and the proinsulin-to-insulin ratio: a cross-sectional study |
title_full_unstemmed |
Associations of age with serum insulin, proinsulin and the proinsulin-to-insulin ratio: a cross-sectional study |
title_sort |
associations of age with serum insulin, proinsulin and the proinsulin-to-insulin ratio: a cross-sectional study |
publisher |
BioMed Central Ltd. |
publishDate |
2010 |
url |
http://www.biomedcentral.com/1472-6823/10/21 |
geographic |
Tromsø |
geographic_facet |
Tromsø |
genre |
Tromsø |
genre_facet |
Tromsø |
op_relation |
http://www.biomedcentral.com/1472-6823/10/21 |
op_rights |
Copyright 2010 Bryhni et al; licensee BioMed Central Ltd. |
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