AI Article Synopsis
- The glycosylation of IgG is important for its interaction with immune cells, and estrogen levels can influence these processes, especially after menopause.
- Researchers aimed to investigate how estrogen regulates IgG glycosylation in postmenopausal conditions using ovariectomized mice treated with estrogen.
- The findings indicated that estrogen treatment enhanced certain glycosylation patterns on IgG without affecting overall glycoprotein sialylation, suggesting estrogen plays a role in modulating immune responses through its impact on IgG glycosylation.
Article Abstract
Introduction: The glycosylation of immunoglobulin (Ig) G regulates IgG interaction capability with Fc gamma receptors found in all immune cells. In pathogenic conditions, estrogen can impact IgG levels and glycosylation. Following menopause, when estrogen levels decline affecting the immune system and potentially leading to a heightened susceptibility of immune activation.
Purpose: In this study, we aim to determine if estrogen levels can regulate IgG glycosylation in postmenopausal healthy situations.
Methods: Mice were ovariectomized to simulate an estrogen-deficient postmenopausal status and then treated with 17-beta-estradiol (E2) at different doses and different administration strategies.
Results: Using a highly sensitive liquid chromatography-tandem mass spectrometry (MS/MS) glycoproteomic method, we demonstrated that E2 treatment increased the degree of glycosylation on IgG-Fc with both galactosylation and sialylation in the position required for interaction with Fc gamma receptors. We also observed that only long-term estrogen deficiency reduces IgG levels and that estrogen status had no impact on total IgG sialylation on both Fab and Fc domains or general glycoprotein sialylation evaluated by ELISA. Furthermore, E2 status did not affect the total sialic acid content of total cells in lymphoid organs and neither B cells nor plasma cells.
Conclusion: The study concluded that E2 treatment does not affect total serum glycoprotein sialylation but alters IgG glycosylation, including IgG sialylation, implying that estrogen functions as an intrinsic modulator of IgG sialylation and could thereby be one pathway by which estrogen modulates immunity.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10519799 | PMC |
| http://dx.doi.org/10.3389/fendo.2023.1243942 | DOI Listing |
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