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The effects of testosterone on the mice pinealocytes: a quantitative study
C A Redins1, J C Novaes, K B Torres
1Departamento de Morfologia, Universidade Federal do Espítito Santo, Vitória, Brasil. redins@npd.ufes.br
Tissue & Cell
|August 13, 1999
Summary
Testosterone significantly impacts the pineal gland in male mice. This study found that testosterone inhibits pineal gland activity by altering dense-core vesicles, lysosomes, and lipid droplets in pinealocytes.
Area of Science:
- Endocrinology
- Cell Biology
- Neuroscience
Background:
- The pineal gland produces hormones that regulate circadian rhythms and reproductive functions.
- Testosterone, a primary male sex hormone, is known to influence various physiological processes.
- The specific effects of testosterone on the pineal gland's cellular components and function remain incompletely understood.
Purpose of the Study:
- To investigate the quantitative ultrastructural changes in the pineal gland of adult male mice in response to testosterone administration and castration.
- To elucidate the role of testosterone in regulating the secretory activity of pinealocytes.
Main Methods:
- Adult male mice were divided into six groups: testosterone propionate treatment, castration, and respective controls.
- Ultrastructural analysis using electron microscopy was performed to quantify dense-core vesicles, lysosomes, and lipid droplets.
- Fractional volume of pineal gland components was determined.
Main Results:
- Testosterone treatment led to a decrease in dense-core vesicles and an increase in lysosomes and lipid droplets.
- Castration resulted in an increase in dense-core vesicles and a decrease in lysosomes.
- These cellular changes indicate a significant alteration in pinealocyte secretory function.
Conclusions:
- Testosterone plays a crucial role in modulating the secretory processes of mouse pinealocytes.
- The findings suggest an inhibitory effect of testosterone on the overall functional activity of the pineal gland.