Decreases in cerebral microvasculature with age are associated with the decline in growth hormone and insulin-like growth factor 1
Abstract
Several reports have demonstrated that cerebral blood flow decreases with age and may contribute to neurodegenerative changes found in aging animals and man. Because GH and insulin-like growth factor 1 (IGF-1) decrease with age and have an important role in vascular maintenance and remodeling, we hypothesized that the decrease in cerebral blood flow is associated with a rarefaction of cerebral blood vessels resulting from a decline in GH and IGF-1. Measurements of vascular density (number of vessels/cortical surface area) in both Brown-Norway and Fisher 344/Brown-Norway rats were made at 5, 13, and 29 months of age using chronic cranial window chambers that allowed viewing of the cortical surface and its corresponding vasculature. Correlations were made with plasma levels of IGF-1. In Brown-Norway rats, arteriolar density decreased from 15.53 +/- 1.08 to 9.49 +/- 0.62 endpoints/mm2 in 7- and 29-month-old animals, respectively (P < 0.05). A decline was observed also in arteriolar anastomoses [3.05 +/- 0.21 to 1.42 +/- 0.24 connections/mm2 in 7- and 29-month-old animals (P < 0.05)]. Venular density did not decrease with age. Similar changes were observed in Fisher 344/Brown-Norway rats. The number of cortical surface arterioles was correlated with plasma IGF-1 levels at the time of vascular mapping (r = 0.772, P < 0.05), and injection of bovine GH (0.25 mg/kg, s.c., twice daily for 35 days) to 30-month-old animals increased both plasma IGF-1 and the number of cortical arterioles. These data indicate that: 1) vascular density on the surface of the cortex decreases with age; 2) vascular density is correlated with plasma levels of IGF-1; and 3) injection of GH increases cortical vascular density in older animals. We conclude that GH and IGF-1 have an important role in the decline in vascular density with age and suggest that decreases in vascular density may have important implications for the age-related decline in cerebral blood flow and brain function.
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- Authors
- Sonntag, W. E., Lynch, C. D., Cooney, P. T., & Hutchins, P. M.
- Affiliations
- Atrium Health Wake Forest Baptist (US)
- Corresponding author
- Sonntag, William E.
- ORCID
- Sonntag, William E.
- Venue
- Endocrinology
- Publisher
- The Endocrine Society
- Published
- 1997-08-01
- Volume
- 138
- Issue
- 8
- Pages
- 3515-3520
- ISSN
- 0013-7227 (ISSN-L)
- 1945-7170
- OpenAlex
- W2070645131
- Semantic Scholar
- 94e1bcedea04d71b83f8734e9cd72af42d7b93fa
- Cited by
- 307
- References
- 42
- Citations by year
- 2026: 6 · 2025: 5 · 2024: 4 · 2023: 10 · 2022: 6 · 2021: 12 · 2020: 14 · 2019: 21 · 2018: 9 · 2017: 15 · 2016: 12 · 2015: 13 · 2014: 11 · 2013: 8 · 2012: 16
- FWCI
- 6.67
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Endocrinology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institute on Aging (P01AG11370, P01AG011370)
- Topics
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Growth Hormone and Insulin-like Growth Factors
- Life Sciences › Neuroscience › Neurology › Barrier Structure and Function Studies
- Life Sciences › Neuroscience › Neurology › Neurological Disease Mechanisms and Treatments
- Keywords
- cerebral microvasculature, vessel density, aging, growth hormone, insulin-like growth factor I, cerebral blood flow, vascular remodeling, neurodegeneration, Brown Norway rats
- MeSH terms
- Aging, Analysis of Variance, Animals, Arterioles, Cattle, Cerebral Arteries, Cerebral Cortex, Cerebral Veins, Insulin-Like Growth Factor I, Male, Rats, Inbred BN, Rats, Inbred F344, Growth Hormone, Rats
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