“…We have found that the hyperalgesia generated by the inflammation resulting from complete Freund's adjuvant (CFA) injection, is significantly reduced by systemic administration of a specific anti-NGF antiserum , implying that NGF contributes directly or indirectly to inflammatory sensitivity changes. The indirect effects of NGF may result from its cytokine-like actions, including stimulation of growth and differentiation of human B lymphocytes Thorpe et al, 1988;Treede et al, 1992), the release of inflammatory mediators from lymphocytes and basophils (Bischoff & Dahinden, 1992;Horigome et al, 1993) and a degranulation of mast cells (Aloe & Levi-Montalcini, 1977;Bohm et al, 1986;Mazurek et al, 1986;Pearce & Thompson, 1986). Direct effects could either be due to a trkA receptor-tyrosine kinase-mediated phosphorylation at the nociceptor terminal, increasing transduction sensitivity, or a consequence of a change in the expression of transmitter/neuromodulators such as substance P and calcitonin gene-related peptide (CGRP) in the cell body (Lindsay & Harmar, 1989;Woolf et al, 1994), amplifying the central actions of the nociceptor in the spinal cord (Lewin et al, 1994).…”