Hematopoietic stem cells debut in embryonic lymphomyeloid tissues of elasmobranchs

  • Rosa Manca Department of Biology, University of Naples Federico II, Italy.
  • Chester Glomski Department of Pathology and Anatomical Sciences, Jacobs School of Medicine, State University of New York, Buffalo, United States.
  • Alessandra Pica | alepica@unina.it Department of Biology, University of Naples Federico II, Italy.


The evolutionary initiation of the appearance in lymphomyeloid tissue of the hemopoietic stem cell in the earliest (most primitive) vertebrate model, i.e. the elasmobranch (chondroichthyan) Torpedo marmorata Risso, has been studied. The three consecutive developmental stages of torpedo embryos were obtained by cesarean section from a total of six pregnant torpedoes. Lymphomyeloid tissue was identified in the Leydig organ and epigonal tissue. The sections were treated with monoclonal anti-CD34 and anti-CD38 antibodies to detect hematopoietic stem cells. At stage I (2-cm-long embryos with external gills) and at stage II (3-4 cm-long embryos with a discoidal shape and internal gills), some lymphoid-like cells that do not demonstrate any immunolabeling for these antibodies are present. Neither CD34+ nor CD38+ cells are identifiable in lymphomyeloid tissue of stage I and stage II embryos, while a CD34+CD38- cell was identified in the external yolk sac of stage II embryo. The stage III (10-11-cm-long embryos), the lymphomyeloid tissue contained four cell populations, respectively CD34+CD38-, CD34+CD38+, CD34-CD38+, and CD34-CD38- cells. The spleen and lymphomyeloid tissue are the principal sites for the development of hematopoietic progenitors in embryonic Torpedo marmorata Risso. The results demonstrated that the CD34 expression on hematopoietic progenitor cells and its extraembryonic origin is conserved throughout the vertebrate evolutionary scale.


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Original Papers
Hematopoietic stem cells, Embryonic hemopoiesis, CD34 /CD38- cells, progenitor cells, elasmobranchs, torpedoes
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How to Cite
Manca, R., Glomski , C., & Pica, A. (2019). Hematopoietic stem cells debut in embryonic lymphomyeloid tissues of elasmobranchs. European Journal of Histochemistry, 63(3). https://doi.org/10.4081/ejh.2019.3060