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Critical Care

, 23:29 | Cite as

The adrenal-vitamin C axis: from fish to guinea pigs and primates

  • Michael H. Hooper
  • Anitra Carr
  • Paul E. MarikEmail author
Open Access
Letter

Keywords

Vitamin C Cortisol Stress response 

Primates and guinea pigs are unable to synthesize vitamin C. In contrast, almost all other mammals produce vitamin C in their livers with production increasing during stress. Furthermore, largely to metabolic consumption, a high percentage of critically ill patients are deficient in vitamin C. In an observational study, Carr et al. found that 75% of critically ill patients had plasma levels of vitamin C that were abnormally low [1]. The degree and incidence of deficiency were most pronounced in those patients with sepsis. Several trials have shown that administration of vitamin C to patients with sepsis is associated with better patient outcomes, suggesting a causal relationship between vitamin C deficiency and outcome. The mechanism(s) by which vitamin C administration may improve outcomes is unclear. Observations of very high vitamin C levels in the adrenal gland as well as its release in response to ACTH suggest that vitamin C plays a role in the stress response [2]. Release of cortisol in response to stress is well documented in humans and throughout the animal kingdom. However, there is marked inter-species variation in the amount of cortisol released in response to a stressor. Interestingly, there is a strong inverse correlation between the ability of an animal to endogenously produce vitamin C and the cortisol response when stressed. Barton et al. reported the baseline cortisol and response of numerous fish species to handling [3]. Those fish species which synthesized vitamin C had a 1.6-fold increase in cortisol levels after stress as compared to a 20.2-fold increase in those fish species that were unable to produce vitamin C, with the non-producers having a significantly higher baseline cortisol level. Additional evidence supports the concept of an inverse correlation between vitamin C and cortisol levels. Guinea pigs that are made deficient in vitamin C hyper-secrete cortisol [4]. Supplementation of ascorbic acid in humans and animal models is associated with a decreased cortisol response after a psychological or physical stressor [5]. High serum levels of cortisol in patients with sepsis are associated with a poor prognosis. Traditionally, this association has been explained on the assumption that higher cortisol responses are due to a more intense physiological stress and a higher severity of illness. However, the inverse relationship of cortisol levels with vitamin C status would suggest an alternative hypothesis, namely, that high levels of cortisol and the associated poorer outcomes of patients are a function of vitamin C deficiency.

Notes

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MHH drafted the original version of the manuscript. PEM and AC reviewed and revised the manuscript. All authors read and approved the final manuscript.

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References

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    Barton BA. Stress in fishes: a diversity of responses with particular reference to changes in circulating corticosteroids. Integr Comp Biol. 2002;42:517–25.CrossRefGoogle Scholar
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Copyright information

© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

Authors and Affiliations

  • Michael H. Hooper
    • 1
  • Anitra Carr
    • 2
  • Paul E. Marik
    • 1
    Email author
  1. 1.Division of Pulmonary and Critical Care MedicineEastern Virginia Medical SchoolNorfolkUSA
  2. 2.Department of PathologyUniversity of Otago, ChristchurchChristchurchNew Zealand

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