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Maternal microchimerism in biliary atresia.

Hiroyuki Kobayashi1, Takuya Tamatani, Tsuyoshi Tamura

  • 1Department of Pediatric General and Urogenital Surgery, Juntendo University School of Medicine, Tokyo 113-8421, Japan. koba@med.juntendo.ac.jp

Journal of Pediatric Surgery
|June 15, 2007
PubMed
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Maternal microchimerism, the presence of maternal cells in infants, was detected in the livers of infants with biliary atresia (BA). This suggests BA may be a maternal graft-versus-host disease.

Area of Science:

  • Immunology
  • Pediatric Gastroenterology
  • Genetics

Background:

  • Biliary atresia (BA) is a serious liver condition in infants.
  • The etiology of BA remains largely unknown.
  • Maternal microchimerism is the presence of maternal cells in a fetus or infant.

Purpose of the Study:

  • To investigate the presence and extent of maternal microchimerism in the livers of BA patients.
  • To explore the potential role of maternal microchimerism in the pathogenesis of BA.

Main Methods:

  • Analysis of male BA livers using X and Y chromosome probes and fluorescent in situ hybridization.
  • HLA typing of female BA patients and their mothers.
  • Testing of female BA livers for antibodies to maternal HLA class I.

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Main Results:

  • Male BA livers showed a mixture of XY and XX cells, indicating maternal cell presence.
  • Female BA patients exhibited varying levels of antimaternal HLA class I antibodies.
  • Control livers did not show these markers.

Conclusions:

  • Preliminary data suggest maternal microchimerism in BA livers.
  • BA may be a form of graft-versus-host disease triggered by maternal microchimerism.
  • Further research is needed to clarify the etiology of BA.