Expression of Homing Receptors in IgM+IgD+CD27+ B Cells and Their Frequencies in Appendectomized and/or Tonsillectomized Individuals

Autores organización

• Maria Consuelo Romero Sanchez

  Autor

Autores

• Bautista D
• Franco M
• Angel J

Grupos de investigación

• Grupo de Inmunología celular y molecular Universidad El Bosque (InmuBo)

  Investigador

  Maria Consuelo Romero Sanchez

Resumen

Background: In humans, blood circulating IgM+IgD+CD27+ B cells are considered analogous to those described in the marginal zone of the spleen and are involved in important immunological processes. The homing receptors they express, and the organs involved in their development (for example, intestinal organs in rabbits) are only partially known. We recently reported that this population is heterogeneous and composed of at least two subsets: one expressing high levels of IgM–IgMhi B cells–and another low levels–IgMlo B cells. Objectives: To evaluate the expression of homing receptors on IgD+CD27+ IgMhi and IgMlo B cells and quantify their frequencies in blood of control and appendectomized and/or tonsillectomized volunteers. Materials and Methods: Using spectral flow cytometry, the simultaneous expression of 12 previously reported markers that differentiate IgMhi B cells and IgMlo B cells and of a4ß7, CCR9, CD22 and CCR10 were evaluated in blood circulating B cells of control and appendectomized and/or tonsillectomized volunteers. Results: The existence of phenotypically defined IgMlo and IgMhi B cell subsets was confirmed. They differentially expressed intestinal homing receptors, and the expression of a4ß7 and CCR9 seems to determine new IgM subpopulations. IgMlo and IgMhi B cells were detected at lower frequencies in the appendectomized and/or tonsillectomized volunteers relative to controls. Conclusions: Human blood circulating IgD+CD27+ IgMlo and IgMhi B cell subsets differentially express homing receptors, and it is necessary to investigate if mucosal organs are important in their development. © 2023 Taylor & Francis Group, LLC.

Keywords

• Animals; B-Lymphocyte Subsets; B-Lymphocytes; Flow Cytometry; Humans; Immunoglobulin M; Rabbits; CD22 antigen; CD27 antigen; chemokine receptor CCR10; chemokine receptor CCR9; homing receptor; immunoglobulin D; immunoglobulin M; integrin; integrin alpha4 beta7; unclassified drug; immunoglobulin M; appendectomy; Article; B lymphocyte; cell differentiation; controlled study; dimensionality reduction; female; flow cytometry; fluorescence intensity; human; human cell; lymphocyte; male; monocyte; tonsillectomy; animal; B lymphocyte subpopulation; Leporidae