Dialogue materno-fœtal et implantation embryonnaire humaine : des concepts qui évoluent

Immunologie de la grossesse : faits nouveaux

The long-standing question of pregnancy immunological paradox has been generating renewed interest. Recent insights have emerged from studies in pregnant mice and humans demonstrating a number of mechanisms that prevent potentially harmful effects of maternal anti-paternal allo-antibodies (complement inhibition, partial deletion of maternal B cells specific of paternal antigens), cytotoxic CD8+ T cells (lack of HLA-A and HLA-B expression on trophoblast, local immunosuppressive molecules, transient tolerance of paternal allo-antigens specific T cells) and uterine NK cells directed against fetal-derived trophoblast cells (limited NK cytotoxic potential, trophoblast resistance to NK killing). Interestingly, it appears that not only decidual NK cell/trophoblast interactions are not harmful for the fetus but are beneficial for the placental vascularization and its subsequent development. A recent report has indeed demonstrated that during pregnancy most of the combinations of uterine KIR (killer cell immunoglobulin-like receptor) NK cell receptors and fetal HLA-C molecules expressed by trophoblast led to normal pregnancies, whereas mothers lacking activating KIR of the AA genotype when the fetus possessed HLA-C of the C2 group were at a greatly increased risk of severe preeclampsia pathology.

Syndrome de Guillain-Barré sévère et grossesse : deux cas d’amélioration rapide en post-partum

INTRODUCTION

Guillain-Barré syndrome can occur at any time of pregnancy with the same incidence as in the general population. Observations. We report two cases of patients who developed a progressive ascending paralysis during the second trimester of pregnancy. The worsening of the respiratory insufficiency for one of them required a transfer to an intensive care unit for artificial ventilation lasting 102 days. In the two cases, cerebrospinal fluid examination revealed albumin-cytological dissociation and repeated electrophysiological studies showed typical features of demyelinating neuropathy with conduction blocks. Biological investigations, especially CMV and Campylobacter jejuni serologies, were all negative. Intravenous immunoglobulin infusions, in one case associated with high doses of corticosteroïds, were ineffective. Rapid improvement was observed in the two patients after delivery.

CONCLUSION

These cases raise the question of the relationships between the Guillain-Barré syndrome and pregnancy. The occurrence of the disease, as well as the rapid recovery in post-partum, could be consecutive to a partial failure of the maternal immunological tolerance toward the fetus.