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JAM-A expression during embryonic development.

James J Parris1, Vesselina G Cooke, William C Skarnes

  • 1Department of Biological Sciences, University of Delaware, Newark, Delaware 19716, USA.

Developmental Dynamics : an Official Publication of the American Association of Anatomists
|June 25, 2005
PubMed
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Junction adhesion molecule-A (JAM-A) is crucial for embryonic development. This study maps JAM-A gene expression in mice, revealing its role in developing vasculature and epithelial systems.

Area of Science:

  • Developmental Biology
  • Cell Biology
  • Molecular Biology

Background:

  • Cell adhesion molecules, particularly the immunoglobulin superfamily, are vital for embryonic development.
  • JAM-A, a tight junction protein, influences platelet activation, leukocyte transmigration, and angiogenesis.

Purpose of the Study:

  • To delineate the spatiotemporal expression pattern of the JAM-A gene during mouse embryogenesis.
  • To investigate the role of JAM-A in the development of embryonic vasculature and organ systems.

Main Methods:

  • Utilized transgenic mice with a lacZ reporter under the JAM-A promoter for histochemical staining.
  • Employed double-staining with anti-JAM-A and anti-platelet endothelial cell adhesion molecule-1 antibodies.
  • Confirmed protein expression using immunofluorescent staining for JAM-A.

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Main Results:

  • JAM-A expression was observed early in blastocysts (inner cell mass, trophectoderm).
  • By 8.5 days post coitum, JAM-A activity was detected in endoderm and ectoderm.
  • Expression localized to the developing inner ear, vasculature, skin, olfactory system, lungs, kidneys, liver, choroid plexuses, and gut tubes.

Conclusions:

  • JAM-A is prominently expressed in embryonic vasculature and epithelial components of multiple developing organs.
  • The observed expression pattern suggests a significant role for JAM-A in embryonic development and organogenesis.