alexa Circadian and circannual variation of the carrageenin inflammatory effect in rat.
Molecular Biology

Molecular Biology

Journal of Cell Science & Therapy

Author(s): Loubaris N, Cros G, Serrano JJ, Boucard M

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Abstract The circadian variation of edema produced by carrageenin (carr.) administration into plantar tissue was studied in rats kept under a 12 light - 12 dark regimen. Three doses were used (125, 250 and 500 micrograms per rat) injected at different time (02.00, 08,00, 14.00 and 20.00 h). With the high doses, the level of edema for the four hour period after carr. administration was similar whatever the hour of injection. In contrast, with the lower dose (125 micrograms) a circadian rhythm in the intensity of the edema produced was observed, showing a maximum of susceptibility during the light span. Repetitive experiments performed at different periods of the year validated this finding. Comparing mean mesors, analysis of this data showed two distinct levels of inflammation, with the lower level observed in autumn and winter indicating evidence for a circannual variability.
This article was published in Life Sci and referenced in Journal of Cell Science & Therapy

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