Role of hormone-controlled Th1- and Th2-type cytokines in successful pregnancy
Section snippets
Functional properties of human Th1 and Th2 lymphocytes
CD4+ T helper (Th) lymphocytes can be classified into different functional subsets based on their profile of cytokine production. Type 1 Th (Th1) cells produce interferon-γ (IFN-γ), interleukin (IL)-2, and tumor necrosis factor (TNF)-β, and promote the production of opsonizing and complement-fixing antibodies, macrophage activation, antibody-dependent cell cytotoxicity and delayed type hypersensitivity. On the other hand, type-2 Th (Th2) cells produce IL-4, IL-5, IL-6, IL-9, IL-10 and IL-13 and
Hormones can polarize the development of the T cells into Th1 or Th2 cells
The differentiation of Th cells into polarized Th1 or Th2 cells can also be influenced by some hormones. The role of steroid hormones in controlling the patterns of T cell lymphokines produced by activated T cells has also been emphasized. Dihydrotestosterone decreased the quantity of IL-4 and IL-5 produced by activated murine T cells (Vacca et al., 1990; Moynihan et al., 1998), whereas glucocorticoids and 1,25-dihydroxyvitamin D3 were found to be capable of reducing IL-2 and IFN-γ and
Role of the hormones enhanced during pregnancy on the development of Th1 and Th2 cells
During pregnancy, steroid hormones act systemically in the preparation of the endometrium for implantation, thus establishing ‘the implantation window’. These actions are not only endocrine through specific steroid receptors but also modulate paracrine autocrine effectors such as cytokines.
Progesterone is well known for its immunosuppressive properties (Szekeres-Bartho, 1992). Postcoital administration of a monoclonal antibody against progesterone prevents pregnancy in several species (White et
Hormonal-cytokine network at maternofetal interface
On the basis of these findings, a hormone cytokine network at the maternofetal interface affecting both in blastocyst implantation and maintenance of a successful pregnancy, can be suggested. The observation that fetal development is not impaired, although fetal antigens are recognized as foreign by the mother, is commonly referred to as the immunological paradox of pregnancy. It is well established that pregnancy is associated with modifications in the immune status of the mother, but the
Conclusions
Antithetical Th1/Th2 cytokine profiles appear to characterize pregnancy. We found a linkage between LIF and Th2-type cytokines, and we suggested that a direct cause-and-effect relationship between a local defect of Th2-type cytokine (IL-4 and IL-10) and LIF expression by T cells and pregnancy loss was possible. Strong evidence now indicates that changes in the production of hormones (progesterone and relaxin) play a major role in modulating Th1/Th2 cytokine balance (Piccinni and Romagnani, 1996
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