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Related Experiment Video

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Modeling Ascending Vaginal Infection, Preterm Birth, and Neonatal Morbidity in Mice
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CXCR3 Polymorphism and Expression Associate with Spontaneous Preterm Birth.

Minna K Karjalainen1, Marja Ojaniemi2, Antti M Haapalainen2

  • 1PEDEGO Research Center and Medical Research Center Oulu, University of Oulu, 90014 Oulu, Finland; Department of Children and Adolescents, Oulu University Hospital, 90029 Oulu, Finland; minna.k.karjalainen@oulu.fi.

Journal of Immunology (Baltimore, Md. : 1950)
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Summary

A specific gene variant (rs2280964) in CXCR3 is linked to spontaneous preterm birth (SPTB). This genetic factor influences placental expression and may disrupt maternal-fetal tolerance, potentially promoting early labor.

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Area of Science:

  • Immunology
  • Genetics
  • Reproductive Biology

Background:

  • Spontaneous preterm birth (SPTB) is a leading cause of infant mortality and morbidity.
  • Genetic and environmental factors contribute to SPTB susceptibility.
  • Previous linkage analysis identified a peak near the CXCR3 gene in families with recurrent SPTB.

Purpose of the Study:

  • To investigate the association between the CXCR3 gene and SPTB in a Finnish cohort.
  • To analyze CXCR3 expression in human placenta and its ligands in umbilical cord blood.
  • To examine the role of Cxcr3 in SPTB-associated cytokines in a mouse model.

Main Methods:

  • Case-control study of Finnish mothers and infants.
  • Genotyping for CXCR3 polymorphism (rs2280964).
  • Analysis of CXCR3 and ligand (CXCL9) levels in placental tissue and cord blood.
  • In vivo study using CXCR3-deficient mice.

Main Results:

  • An intronic CXCR3 polymorphism (rs2280964) was associated with SPTB in infants from families with recurrent preterm births.
  • The minor allele of rs2280964 was found to be protective and undertransmitted in SPTB infants.
  • Higher CXCR3 expression was observed in SPTB placentas, and increased CXCL9 levels were detected in SPTB cord blood.
  • CXCR3-deficient mice showed no acute increase in SPTB-associated cytokines after LPS challenge.

Conclusions:

  • The CXCR3 gene and its signaling pathway contribute to spontaneous preterm birth.
  • Activation of CXCR3 signaling may impair maternal-fetal tolerance, potentially initiating preterm labor.