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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ftdoajarticles:oai:doaj.org/article:be199568dc6d4fe2a6bc3f412e226bf9 2023-05-15T18:34:49+02:00 Associations of age with serum insulin, proinsulin and the proinsulin-to-insulin ratio: a cross-sectional study Arnesen Egil Bryhni Bente Jenssen Trond G 2010-12-01T00:00:00Z https://doi.org/10.1186/1472-6823-10-21 https://doaj.org/article/be199568dc6d4fe2a6bc3f412e226bf9 EN eng BMC http://www.biomedcentral.com/1472-6823/10/21 https://doaj.org/toc/1472-6823 doi:10.1186/1472-6823-10-21 1472-6823 https://doaj.org/article/be199568dc6d4fe2a6bc3f412e226bf9 BMC Endocrine Disorders, Vol 10, Iss 1, p 21 (2010) Diseases of the endocrine glands. Clinical endocrinology RC648-665 article 2010 ftdoajarticles https://doi.org/10.1186/1472-6823-10-21 2022-12-31T08:55:25Z 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 Directory of Open Access Journals: DOAJ Articles Tromsø BMC Endocrine Disorders 10 1 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Diseases of the endocrine glands. Clinical endocrinology RC648-665 |
spellingShingle |
Diseases of the endocrine glands. Clinical endocrinology RC648-665 Arnesen Egil Bryhni Bente Jenssen Trond G Associations of age with serum insulin, proinsulin and the proinsulin-to-insulin ratio: a cross-sectional study |
topic_facet |
Diseases of the endocrine glands. Clinical endocrinology RC648-665 |
description |
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 |
Arnesen Egil Bryhni Bente Jenssen Trond G |
author_facet |
Arnesen Egil Bryhni Bente Jenssen Trond G |
author_sort |
Arnesen Egil |
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 |
BMC |
publishDate |
2010 |
url |
https://doi.org/10.1186/1472-6823-10-21 https://doaj.org/article/be199568dc6d4fe2a6bc3f412e226bf9 |
geographic |
Tromsø |
geographic_facet |
Tromsø |
genre |
Tromsø |
genre_facet |
Tromsø |
op_source |
BMC Endocrine Disorders, Vol 10, Iss 1, p 21 (2010) |
op_relation |
http://www.biomedcentral.com/1472-6823/10/21 https://doaj.org/toc/1472-6823 doi:10.1186/1472-6823-10-21 1472-6823 https://doaj.org/article/be199568dc6d4fe2a6bc3f412e226bf9 |
op_doi |
https://doi.org/10.1186/1472-6823-10-21 |
container_title |
BMC Endocrine Disorders |
container_volume |
10 |
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1 |
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1766219744955858944 |