Connexin 43 communication channels in follicular dendritic cell development and in follicular lymphomas

Hajnalka Rajnai, Ivett Teleki, Gergo Kiszner, Nora Meggyesházi, Peter Balla, Tamas Vancsik, G. Müzes, Judit Csomor, A. Matolcsy, T. Krenács

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Abstract

Follicular dendritic cells (FDC) show homo- and heterocellular metabolic coupling through connexin 43 (Cx43) gap junctions and support B cell selection and maturation in germinal centers. In follicular lymphomas B cells escape apoptosis while FDC develop abnormally. Here we tested Cx43 channels in reactive FDC development and follicular lymphomas. In culture, the treatment of FDC-B cell clusters (resembling to "ex vivo" germinal centers) with Gap27 peptide, mimicking the 2nd extracellular loop of Cx43 protein, significantly impaired FDC-B cell cluster formation and cell survival. In untreated cultures of intact clusters, cell proliferation showed a moderate reduction. In tissues, Cx43 protein levels run parallel with the density of FDC both in reactive germinal centers and in malformed follicles of follicular lymphomas and showed strong upregulation in newly generated and/or degrading bi-/multinuclear FDC of rudimentary processes. However, the inverse correlation between Cx43 expression and B cell proliferation seen in reactive germinal centers was not detected in follicular lymphomas. Furthermore, Cx43 levels were not associated with either lymphoma grade or bone marrow involvement. Our results suggest that Cx43 channels are critical in FDC and "ex vivo" germinal center development and in the persistence of FDC in follicular lymphomas but do not affect tumor progression.

Original languageEnglish
Article number528098
JournalJournal of Immunology Research
Volume2015
DOIs
Publication statusPublished - Mar 2 2015

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Follicular Dendritic Cells
Connexin 43
Follicular Lymphoma
Germinal Center
B-Lymphocytes
Cell Proliferation
Gap Junctions
Lymphoma
Cell Survival
Proteins
Up-Regulation
Bone Marrow
Apoptosis

ASJC Scopus subject areas

  • Immunology
  • Immunology and Allergy

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Connexin 43 communication channels in follicular dendritic cell development and in follicular lymphomas. / Rajnai, Hajnalka; Teleki, Ivett; Kiszner, Gergo; Meggyesházi, Nora; Balla, Peter; Vancsik, Tamas; Müzes, G.; Csomor, Judit; Matolcsy, A.; Krenács, T.

In: Journal of Immunology Research, Vol. 2015, 528098, 02.03.2015.

Research output: Contribution to journalArticle

Rajnai, Hajnalka ; Teleki, Ivett ; Kiszner, Gergo ; Meggyesházi, Nora ; Balla, Peter ; Vancsik, Tamas ; Müzes, G. ; Csomor, Judit ; Matolcsy, A. ; Krenács, T. / Connexin 43 communication channels in follicular dendritic cell development and in follicular lymphomas. In: Journal of Immunology Research. 2015 ; Vol. 2015.
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