Sertoli cells initiate testicular innate immune responses through TLR activation

Anna Riccioli, Donatella Starace, Roberta Galli, Andrea Fuso, Sigfrido Scarpa, Fioretta Palombi, Paola De Cesaris, Elio Ziparo, Antonio Filippini

Research output: Contribution to journalArticle

Abstract

TLRs play a crucial role in early host defense against invading pathogens. In the seminiferous epithelium, Sertoli cells are the somatic nurse cells that mechanically segregate germ cell autoantigens by means of the blood-tubular barrier and create a microenvironment that protects germ cells from both interstitial and ascending invading pathogens. The objective of this study was to examine TLR expression and their functional responses to specific agonists in mouse Sertoli cells. We measured the expression of TLR2, TLR4, TLR5, and TLR6 mRNAs and confirmed by FACS analysis the presence of proteins TLR2 and TLR5 on which we focused our study. Stimulation of Sertoli cells with macrophage-activating lipopeptide-2, agonist of TLR2/TLR6, and with flagellin, agonist of TLR5, induces augmented secretion of the chemokine MCP-1. To assess the functional significance of MCP-1 production following TLR stimulation, conditioned medium from either macrophage-activating lipepeptide-2 or flagellin-treated Sertoli cells was tested for in vitro chemotaxis assay, and a significant increase of macrophage migration was observed in comparison with unstimulated conditioned medium. Moreover, we studied the role of NF-κB and of MAPKs in regulating TLR-mediated MCP-1 secretion by using inhibitors specific for each transduction pathway and we demonstrated a pivotal role of the IκB/NF-κB and JNK systems. In addition, TLR2/TLR6 and TLR5 stimulation induces increased ICAM-1 expression in Sertoli cells. Collectively, this study demonstrates the novel ability of Sertoli cells to potentially respond to a wide variety of bacteria through TLR stimulation.

Original languageEnglish
Pages (from-to)7122-7130
Number of pages9
JournalJournal of Immunology
Volume177
Issue number10
Publication statusPublished - Nov 15 2006

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Sertoli Cells
Innate Immunity
Flagellin
Macrophages
Conditioned Culture Medium
Germ Cells
Seminiferous Epithelium
Lipopeptides
Aptitude
Autoantigens
Chemotaxis
Intercellular Adhesion Molecule-1
Chemokines
Nurses
Bacteria
Messenger RNA
Proteins

ASJC Scopus subject areas

  • Immunology

Cite this

Riccioli, A., Starace, D., Galli, R., Fuso, A., Scarpa, S., Palombi, F., ... Filippini, A. (2006). Sertoli cells initiate testicular innate immune responses through TLR activation. Journal of Immunology, 177(10), 7122-7130.

Sertoli cells initiate testicular innate immune responses through TLR activation. / Riccioli, Anna; Starace, Donatella; Galli, Roberta; Fuso, Andrea; Scarpa, Sigfrido; Palombi, Fioretta; De Cesaris, Paola; Ziparo, Elio; Filippini, Antonio.

In: Journal of Immunology, Vol. 177, No. 10, 15.11.2006, p. 7122-7130.

Research output: Contribution to journalArticle

Riccioli, A, Starace, D, Galli, R, Fuso, A, Scarpa, S, Palombi, F, De Cesaris, P, Ziparo, E & Filippini, A 2006, 'Sertoli cells initiate testicular innate immune responses through TLR activation', Journal of Immunology, vol. 177, no. 10, pp. 7122-7130.
Riccioli A, Starace D, Galli R, Fuso A, Scarpa S, Palombi F et al. Sertoli cells initiate testicular innate immune responses through TLR activation. Journal of Immunology. 2006 Nov 15;177(10):7122-7130.
Riccioli, Anna ; Starace, Donatella ; Galli, Roberta ; Fuso, Andrea ; Scarpa, Sigfrido ; Palombi, Fioretta ; De Cesaris, Paola ; Ziparo, Elio ; Filippini, Antonio. / Sertoli cells initiate testicular innate immune responses through TLR activation. In: Journal of Immunology. 2006 ; Vol. 177, No. 10. pp. 7122-7130.
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