Immunoregulatory pathways in pregnancy
IR@NISCAIR: CSIR-NISCAIR, New Delhi - ONLINE PERIODICALS REPOSITORY (NOPR)
View Archive Info| Field | Value | |
| Creator |
Hegde, Umashashi C
Ranpura, Sandeep D'Souza, Serena Raghavan, Vijaya P |
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| Date |
2012-12-25T18:16:52Z
2012-12-25T18:16:52Z 2001-08 |
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| Identifier |
0975-0959 (Online); 0301-1208 (Print)
http://hdl.handle.net/123456789/15296 |
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| Description |
207-219
Murine pregnancy is characterized by transient thymic atrophy and splenomegally. Several laboratories are investigating the immunoregulatory mechanisms during pregnancy, and the majority of these studies are primarily focused on the immunological changes either in the uterus or the thymus and not much information is available on the immunological changes in the spleen that result in transient splenomegally. An attempt has been made in this review to understand the significance of thymic atrophy, splenomegally and local immune changes in the uterus to understand the overall immunomodulatory mechanisms in pregnant mother. The most significant change which occurs soon after mating is the infiltration of immune cell s such as macrophages and yδ-T cells into the uterus indicating that the mother's immune system detects the presence of foreign antigens in the reproductive tract. The sensitized cells appear to migrate to the secondary lymphoid organs including the spleen. The microenvironment in the spleen is conducive for the cell -cell contact and generation of immune response. The major changes that occur in the spleen are,t he induction of T-cell dependent B-cell response on day-1 post-coitum (P.C), generation of antibody producing B-cells on day-3 and also proliferation of CD<sub>8</sub>+ T-cells that peaks on day-3 of pregnancy. The weight of the spleen reaches a peak on day- 10 in mice. Thereafter, on day-15 of pregnancy, lymphocyte apoptosis is seen in the spleen indicating the deletion of peripheral sensitized cells. This results in decrease in spleen weight to that of normal non-pregnant mice. The decrease in thymic weight after day-5 pregnancy was associated with the increased apoptosis of cortical thymocytes. This perhaps is due to negative selection of self-reactive thymocytes. Our studies have demonstrated that the pregnancy associated monoclonal antibodies react with antigens of sperm indicating that the mother's immune system recognizes and responds to the constituents of the semen to produce nonprecipitating asymmetric auto antibodies (NPAA) or blocking antibodies which have favourable effects on pregnancy. It is postulated that the mother's immune response could be directed to some antigens of sperm along with some conserved antigens such as heat shock proteins (HSP) that are present both in sperm and in the mother. It may be speculated that after the initial priming to some conserved antigens of sperm and due to the presence of similar an ti gens in the mother, these activated clones are eliminated both in the primary and secondary lymphoid organs to prevent autoimmunity in the mother during pregnancy. |
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| Language |
en_US
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| Publisher |
NISCAIR-CSIR, India
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| Rights |
<img src='http://nopr.niscair.res.in/image/cc-license-sml.png'> <a href='http://creativecommons.org/licenses/by-nc-nd/2.5/in' target='_blank'>CC Attribution-Noncommercial-No Derivative Works 2.5 India</a>
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| Source |
IJBB Vol.38(4) [August 2001]
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| Title |
Immunoregulatory pathways in pregnancy
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| Type |
Article
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