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Flow Cytometry-based Assay for the Monitoring of NK Cell Functions
Published on: October 30, 2016
Hormone replacement therapy affects various immune cell subsets and natural cytotoxicity
R Brunelli1, D Frasca, G Perrone
1First Obstetrics and Gynecology Clinic, University, La Sapienza, Rome, Italy.
Gynecologic and Obstetric Investigation
|January 1, 1996
Summary
Hormone replacement therapy (HRT) impacts immune cells, reducing specific lymphocyte subsets and altering granulocyte membrane antigens. These changes highlight HRT's selective influence on immune cell function in menopausal women.
Area of Science:
- Immunology
- Endocrinology
- Women's Health
Background:
- The detailed effects of hormone replacement therapy (HRT) on lymphocytes and granulocytes remain largely undetermined.
- Menopausal women undergoing HRT require a comprehensive understanding of its immunological consequences.
Purpose of the Study:
- To investigate the specific effects of a combined transdermal estradiol and oral medroxyprogesterone acetate regimen on immune cell subsets.
- To analyze the impact of HRT on lymphocyte and granulocyte populations and functions in healthy menopausal women.
Main Methods:
- Ten healthy menopausal women received HRT (transdermal estradiol and oral medroxyprogesterone acetate) for six months.
- Immune cell subsets (CD4+CD45RO+, CD56+, CD8+CD11b+) and natural killer cell function were assessed at multiple time points (days 0, 8, 21, 28) during the first and last month of treatment.
- Granulocyte membrane antigen expression (Leu8, CD11b) was evaluated during the initial month of HRT.
Main Results:
- HRT significantly reduced CD4+CD45RO+ cells by day 8.
- CD56+ and CD8+CD11b+ cells decreased by day 21, returning to baseline by day 28.
- Natural killer cell function showed transient increase on day 8, followed by a significant reduction on day 21.
- Granulocyte membrane antigen expression was notably affected by HRT during the first month.
Conclusions:
- Hormone replacement therapy selectively modulates various immune cell subsets in menopausal women.
- The observed alterations in lymphocytes and granulocytes suggest a significant impact of HRT on the immune system's composition and function.
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