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. 1988 Feb;71(2):329–335.

Circadian rhythms in circulating T lymphocyte subtypes and plasma testosterone, total and free cortisol in five healthy men

F A Lévi, Chantal Canon, Y Touitou, J Sulon, M Mechkouri, Emilie Demey Ponsart, J P Touboul, J M Vannetzel, Irène Mowzowicz, A Reinberg, G Mathe
PMCID: PMC1541435  PMID: 2964961

Abstract

Circadian variations of circulating T lymphocyte subtypes and their possible relations with those of endogenous cortisol or testosterone were investigated in five healthy young men. Venous blood (40 ml) was obtained every 4 h for 24 h from each subject in January, March, June, August and November. Leucocyte and differential counts were measured. Mononuclear cells were isolated on Ficoll-Paque gradient, and samples were incubated with OKT3, OKT4 or OKT8 monoclonal antibodies for characterizing all T, T helper and T suppressor-cytotoxic lymphocytes respectively. The proportion of labelled lymphocytes was determined under an epifluorescence microscope and the counts of circulating lymphocyte subsets (cells/mm3) computed. Total and free cortisol and testosterone were also determined in the corresponding plasma samples. Results from analysis of variance and cosinor indicated statistically significant differences (P<0·001) as a function of both individual subject and circadian sampling time for all variables. Circadian rhythms (with a period, τ≡24 h) were validated for total, T and T helper lymphocytes and for the T helper: T suppressor-cytotoxic ratio (P<0·001), with double amplitudes (2A, total extent of variation accounted for by the fitted cosine function) ranging from 25% up to 50% of the 24 h mean (M), and acrophases (Φ, time of maximum) localized near 0100 h. A rhythm with τ≡12 h characterized circulating T suppressor-cytotoxic lymphocytes (P<0·001; 2A=36% of M; Φ=0830 and 2030 h). Circadian rhythms were also found for plasma cortisol (either total or free) and testosterone (P<0·001). No correlation was found however between time-qualified data of these hormones and the immunological variables herein investigated (162 pairs of data) whether or not a 4 h or an 8 h lag time was considered to allow for hormonal actions to operate. This suggests that neither the circadian organization of the adrenal cortex nor that of the testis play a prominent role in the circadian time structure of the circulation of T lymphocytes.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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