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Development, Vol 107, Issue 3 445-452, Copyright © 1989 by Company of Biologists

JOURNAL ARTICLES

Ontogeny and tissue distribution of leukocyte-common antigen bearing cells during early development of Xenopus laevis

H Ohinata, S Tochinai and C Katagiri
Faculty of Science, Hokkaido University, Sapporo, Japan.

To analyze the ontogenic emergence of leukocytes during early development, a mouse monoclonal antibody (IgG1), designated as XL-1, was produced against the peritoneal macrophages of adult Xenopus laevis. The XL-1 determinant was expressed on all types of leukocytes, including lymphocytes, granulocytes, thrombocytes and macrophages, but not on erythrocytes of either larvae or adults. Immunohistochemical observations of the hemopoietic organs revealed that the XL-1+ cells with granulocyte and/or macrophage morphology appeared at st.36-37 in the liver, at st.44-45 in the mesonephric and the thymus rudiments, and at st.47 in the spleen. The XL-1 determinant was expressed on the precursor cells of T lymphocytes in the thymus rudiments at st.46-47, on the pre-B cells in the liver rudiments at st.47, and on lymphocytes in the spleen at st.48-49. A few XL-1+ cells were present in the ventral blood island of the st.35/36 embryos, where differentiating erythrocytes had predominated since st.28. XL-1+ cells with a macrophage-like morphology were found in several locations of the mesenchyme in the st.32 embryos, before the establishment of vascularization at st.33/34 and far earlier than the emergence of lymphocytes.


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© The Company of Biologists Ltd 1989