Nerve growth factor and cytokines mediate lymphoid tissue-induced neurite outgrowth from mouse superior cervical ganglia in vitro

Kannan, Y.; Bienenstock, J.; Ohta, M.; Stanisz, A.M.; Stead, R.H.

Journal of Immunology 157(1): 313-320

1996


ISSN/ISBN: 0022-1767
PMID: 8683132
Accession: 009082050

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Abstract
Superior cervical ganglia (SCG) from neonatal mice were cultured with adult murine lymphoid tissue explants in Matrigel (Collaborative Biomedical, Bedford, MA). After 1 and 2 days in culture, many neurites grew toward thymus and spleen. Normal mesenteric lymph node (MLN) induced a smaller effect; however, activated MLN (isolated from mice 10 days after infection with Nippostrongylus brasiliensis, Nb-MLN-10d) caused significantly increased neurite outgrowth. To determine the roles of nerve growth factor (NGF) and cytokines in the promotion of neuritogenesis by lymphoid tissues, anti-NGF and various anti-cytokines were added to co-cultures. Anti-NGF inhibited most of the neurite outgrowth toward thymus and spleen but only partially that toward Nb-MLN-10d. Anti-mouse IL-1-beta also significantly reduced the number of neurites growing toward thymus, spleen, and normal MLN. The number of neurites growing toward Nb-MLN-1 Od was significantly reduced by anti-IL-1-beta, anti-IL-3, anti-IL-6, or anti-GM-CSF. Exogenous IL-1-beta and IL-3 caused neurite outgrowth in single SCG cultures; and the IL-1-beta-, but not the IL-3-, mediated effect was completely blocked by anti-NGF. In one-day thymus/SCG co-cultures, endogenous IL-1 was not detectable at concentrations sufficient to cause nerve growth; however, ample NGF was present in the thymic tissues and culture supernatants, but not in SCG. These data suggest that IL-1 mediates NGF production in lymphoid tissues, which in turn induces the growth of sympathetic nerves. Moreover, IL-3, IL-6, or GM-CSF produced during inflammation might also play important roles in the stimulation of nerve growth in vivo.