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Seasonal variability in blood platelet 3H-imipramine binding in healthy controls: age and gender effects
Insights
Seasonal variations in blood platelet imipramine binding were observed in women, with peaks in summer and troughs in spring, highlighting the need to consider gender and season in binding studies.
Area of Science:
- Pharmacology
- Neuroscience
- Chronobiology
Background:
- 3H-imipramine binding to blood platelet membranes is a biomarker.
- Seasonal variations can influence biological processes.
- Previous research has not fully explored gender-specific seasonal effects on imipramine binding.
Purpose of the Study:
- To investigate potential seasonal variations in 3H-imipramine binding to platelet membranes.
- To determine if these variations differ between genders.
- To assess the relationship between binding parameters, age, and season.
Main Methods:
- Blood platelets were collected from 26 healthy volunteers (11 men, 15 women) across four seasons over one year.
- Tritiated imipramine (3H-imipramine) binding assays were performed on platelet membranes.
- Statistical analyses were used to identify seasonal and gender-specific differences.
Main Results:
- Significant seasonal variations in the maximum number of binding sites were detected in women, not men.
- Women exhibited a circannual peak in binding during summer and a nadir in spring.
- The seasonal patterns of binding differed between men and women; no age correlation was found.
Conclusions:
- Gender and season are critical factors to monitor in 3H-imipramine binding studies.
- Seasonal variations in platelet imipramine binding are gender-dependent.
- These findings suggest a potential role for seasonal influences on serotonin transporter availability.
Abstract:
Binding of 3H-imipramine to blood platelet membranes was determined four times (once each season) in 26 healthy volunteers (11 men and 15 women), over the course of 1 year to determine possible seasonal variations. Blood platelets were obtained in April-May, July-August, October-November, and January-February. Significant seasonal variations in the maximum number of binding sites were found in women but not in men, with circannual peak in summer and a nadir in spring. The pattern of seasonal variations was not the same in men and women. The present results highlight the importance of monitoring for gender and season in binding studies. We found no significant correlation between 3H-imipramine binding parameters and age.