PLoS ONE (Jan 2020)

Brain-specific angiogenesis inhibitor 1 is expressed in the Myo/Nog cell lineage.

  • Jacquelyn Gerhart,
  • Jessica Bowers,
  • Lindsay Gugerty,
  • Colby Gerhart,
  • Mark Martin,
  • Fathma Abdalla,
  • Arturo Bravo-Nuevo,
  • Jonathan Tabb Sullivan,
  • Rebecca Rimkunas,
  • Amie Albertus,
  • Lou Casta,
  • Lori Getts,
  • Robert Getts,
  • Mindy George-Weinstein

DOI
https://doi.org/10.1371/journal.pone.0234792
Journal volume & issue
Vol. 15, no. 7
p. e0234792

Abstract

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The Myo/Nog cell lineage was discovered in the chick embryo and is also present in adult mammalian tissues. The cells are named for their expression of mRNA for the skeletal muscle specific transcription factor MyoD and bone morphogenetic protein inhibitor Noggin. A third marker for Myo/Nog cells is the cell surface molecule recognized by the G8 monoclonal antibody (mAb). G8 has been used to detect, track, isolate and kill Myo/Nog cells. In this study, we screened a membrane proteome array for the target of the G8 mAb. The array consisted of >5,000 molecules, each synthesized in their native confirmation with appropriate post-translational modifications in a single clone of HEK-293T cells. G8 mAb binding to the clone expressing brain-specific angiogenesis inhibitor 1 (BAI1) was detected by flow cytometry, re-verified by sequencing and validated by transfection with the plasmid construct for BAI1. Further validation of the G8 target was provided by enzyme-linked immunosorbent assay. The G8 epitope was identified by screening a high-throughput, site directed mutagenesis library designed to cover 95-100% of the 954 amino acids of the extracellular domain of the BAI1 protein. The G8 mAb binds within the third thrombospondin repeat of the extracellular domain of human BAI1. Immunofluorescence localization experiments revealed that G8 and a commercially available BAI1 mAb co-localize to the subpopulation of Myo/Nog cells in the skin, eyes and brain. Expression of the multi-functional BAI1 protein in Myo/Nog cells introduces new possibilities for the roles of Myo/Nog cells in normal and diseased tissues.