The activation of BAFF/APRIL system in spleen and lymph nodes of Plasmodium falciparum infected patients

Sci Rep. 2020 Mar 2;10(1):3865. doi: 10.1038/s41598-020-60763-3.

Abstract

Previous studies have reported activation of the B cell-activating factor (BAFF)/a proliferation-inducing ligand (APRIL) system in T independent immunity against malaria infection. Plasmodium falciparum (P. falciparum) infected animal model is not feasible. Therefore, little is known about the occurrence of BAFF/APRIL system and changes in falciparum lymphoid tissues. This study aimed to investigate the expression of BAFF/APRIL system components in lymphoid tissues from P. falciparum infected patients. Spleen and lymph node samples from 14 patients were collected at autopsy. Normal spleens and bacterially infected tonsils served as controls. The protein and/or mRNA expression of BAFF/APRIL and their cognate receptors, BAFF-R, TACI and BCMA, were determined by immunohistochemistry and RT-qPCR, respectively. The spleens of the patients exhibited significantly higher BAFF-R protein expression than normal spleens. Although without appropriate control, BCMA protein was markedly observed only in the lymph nodes. BAFF and BCMA mRNA levels were also significantly elevated in the spleen tissues of the patients compared with normal spleens. The overall BAFF-R protein levels in the lymphoid tissues of the patients correlated positively with parasitaemia. These findings are the first to confirm that BAFF/APRIL system activation in lymphoid tissues and is positively correlated with the parasitaemia levels in falciparum malaria.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • B-Cell Activating Factor / metabolism*
  • B-Cell Activation Factor Receptor / biosynthesis
  • B-Cell Maturation Antigen / biosynthesis
  • DNA-Binding Proteins / metabolism*
  • Gene Expression Regulation
  • Humans
  • Lymph Nodes / metabolism*
  • Lymph Nodes / parasitology
  • Lymph Nodes / pathology
  • Malaria, Falciparum / metabolism*
  • Malaria, Falciparum / pathology
  • Plasmodium falciparum / metabolism*
  • Spleen / metabolism*
  • Spleen / parasitology
  • Spleen / pathology
  • Transcription Factors / metabolism*
  • Transmembrane Activator and CAML Interactor Protein / biosynthesis

Substances

  • B-Cell Activating Factor
  • B-Cell Activation Factor Receptor
  • B-Cell Maturation Antigen
  • DNA-Binding Proteins
  • PDS5B protein, human
  • TNFRSF13B protein, human
  • TNFRSF13C protein, human
  • TNFRSF17 protein, human
  • TNFSF13B protein, human
  • Transcription Factors
  • Transmembrane Activator and CAML Interactor Protein