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Brain water as a function of age and weight in normal rats

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  • Allan Gottschalk
  • Susanna Scafidi
  • Thomas J K Toung

Abstract

Rats are frequently used for studying water content of normal and injured brain, as well as changes in response to various osmotherapeutic regimens. Magnetic resonance imaging in humans has shown that brain water content declines with age as a result of progressive myelination and other processes. The purpose of this study was to quantify changes in brain water content during rat development and aging. Brain water content was measured by standard techniques in 129 normal male Sprague-Dawley rats that ranged in age (weight) from 13 to 149 days (18 to 759 g). Overall, the results demonstrated a decrease in water content from 85.59% to 76.56% with increasing age (weight). Nonlinear allometric functions relating brain water to age and weight were determined. These findings provide age-related context for prior rat studies of brain water, emphasize the importance of using similarly aged controls in studies of brain water, and indicate that age-related changes in brain water content are not specific to humans.

Suggested Citation

  • Allan Gottschalk & Susanna Scafidi & Thomas J K Toung, 2021. "Brain water as a function of age and weight in normal rats," PLOS ONE, Public Library of Science, vol. 16(9), pages 1-6, September.
    • Handle: RePEc:plo:pone00:0249384
    DOI: 10.1371/journal.pone.0249384
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    References listed on IDEAS

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    1. Shir Filo & Oshrat Shtangel & Noga Salamon & Adi Kol & Batsheva Weisinger & Sagiv Shifman & Aviv A. Mezer, 2019. "Disentangling molecular alterations from water-content changes in the aging human brain using quantitative MRI," Nature Communications, Nature, vol. 10(1), pages 1-16, December.
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