Acute inflammation in the joint: its control by the sympathetic nervous system and by neuroendocrine systems

Kristen Sparrow • June 10, 2014

I’m going through data and just can’t grapple with the different profiles of different patients.  Methinks it is much more complicated than I want to admit.  I’ve written to the author of this paper and hope to get a copy.(Update: He kindly emailed me the full paper.)Acute Inflammation in the Joint Its control by the sympathetic nervous system  Not only is the autonomic nervous system involved in joint inflammation, so is the gut.  More and more complicated for monitoring…  I will say that reading papers  like this, it seems to make the case for more traditional acupuncture treatment.  This paper, for example shows the importance of sympathetic input and has a study on the articular nerve of the knee leading to decreased inflammation, electro stim.  Point is, I had stopped using the posterior approach to the knee because it made not sense to me. D’oh. Often the ancients really knew what they were doing.  Humbling.
Auton Neurosci. 2014 May;182:42-54.
Acute inflammation in the joint: its control by the sympathetic nervous system and by neuroendocrine systems.
Jänig W1, Green PG2.
Inflammation of tissues is under neural control involving neuroendocrine, sympathetic and central nervous systems. Here we used the acute experimental inflammatory model of bradykinin-induced plasma extravasation (BK-induced PE) of the rat knee joint to investigate the neural and neuroendocrine components controlling this inflammation. 1. BK-induced PE is largely dependent on the sympathetic innervation of the synovium, but not on activity in these neurons and not on release of norepinephrine. 2. BK-induced PE is under the control of the hypothalamo-pituitary-adrenal (HPA) system and the sympatho-adrenal (SA) system, activation of both leading to depression of BK-induced PE. The inhibitory effect of the HPA system is mediated by corticosterone and dependent on the sympathetic innervation of the synovium. The inhibitory effect of the SA system is mediated by epinephrine and β2-adrenoceptors. 3. BK-induced PE is inhibited during noxious stimulation of somatic or visceral tissues and is mediated by the neuroendocrine systems. The nociceptive-neuroendocrine reflex circuits are (for the SA system) spinal and spino-bulbo-spinal. 4. The nociceptive-neuroendocrine reflex circuits controlling BK-induced PE are under powerful inhibitory control of vagal afferent neurons innervating the defense line (connected to the gut-associated lymphoid tissue) of the gastrointestinal tract. This inhibitory link between the visceral defense line and the central mechanisms controlling inflammatory mechanisms in body tissues serves to co-ordinate protective defensive mechanisms of the body. 5. The circuits of the nociceptive-neuroendocrine reflexes are under control of the forebrain. In this way, the defensive mechanisms of inflammation in the body are co-ordinated, optimized, terminated as appropriate, and adapted to the behavior of the organism.