The cervical sympathetic trunk-submandibular gland neuroendocrine axis play
s an integral role in physiological adaptations and contributes to the main
tenance of systemic homeostasis, particularly under the 'stress conditions'
seen with tissue damage, inflammation, and aggressive behavior. The variet
y of polypeptides, whose release from acinar and ductal cells is under symp
athetic nervous system control, offers coordinated and progressive levels o
f endocrine communication. Proteolytic enzymes (e.g. the kallikreins and fu
rin maturases) are involved in the conversion of inactive precursors (e.g.
Pro-EGF and SMR1) into biologically active molecules (e.g. EGF, SMR1-pentap
eptide), which act on local or distant targets and thereby modulate the hom
eostatic process. (C) 2000 Elsevier Science Inc. All rights reserved.