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• W1993474313 abstract "Intradermal inoculation of rats at the tail base with Mycobacterium butyricum led to the gradual development of an arthritic swelling of the limbs which peaked at 3 weeks and subsided thereafter. Arthritic rats displayed a loss of body weight, hypophagia, and hypodipsia in addition to a disruption of the diurnal rhythms of ingestive behavior and of core temperature. The activity of adenohypophyseal beta- endorphin-(beta-EP) secreting corticotrophs, in contrast to prolactin- (PRL) secreting lactotrophs, was increased in arthritic rats. Indeed, hypertrophy of the adrenal glands was seen. Arthritic rats also showed an elevation in spinal cord levels of immunoreactive dynorphin (DYN), an endogenous ligand of the kappa-opioid receptor. The paws and tail of arthritic rats showed lower thresholds in response to noxious pressure (hyperalgesia), higher thresholds in response to noxious heat (hypoalgesia), and no change in their response to noxious electrical stimulation. Neither naloxone nor ICI-154, 129 (a preferential delta- receptor antagonist) modified the responses of the paw or tail to pressure. However, MR 2266 (an antagonist with higher activity at kappa- receptors) decreased thresholds to pressure in arthritic, but not control, rats; that is, it potentiated the hyperalgesia. This action was stereospecific. None of the antagonists modified the response to heat. MR 2266 did not affect the response to pressure in rats with acute inflammation produced by yeast. Thus, the potentiation of pressure hyperalgesia by MR 2266 in chronic arthritic rats is highly selective. Arthritic rats showed a reduced response to the analgesic effect of a kappa-agonist (U-50,488H), whereas the response to a mu- agonist (morphine) was enhanced. These effects were specific to nociception in that their influence upon endocrine secretion (PRL and beta-EP) was otherwise changed. The secretion of beta-EP and PRL was stimulated by both morphine and U-50,488H, and the influence of U- 50,488H upon the release of beta-EP (from the adenohypophysis) was enhanced in arthritic rats. It is suggested that polyarthritis is a complex condition entailing many changes, both behavioral and endocrinological. Further, arthritic rats cannot simply be described as “hyperalgesic”: of critical importance is the nature of the nociceptive stimulus applied. The parallel alterations in spinal cord pools of DYN and kappa-receptors (see also Millan et al., 1986) and the changes in the influence on nociception of kappa-agonists and kappa-antagonists suggest an increased activity of spinal DYN. Thus, spinal kappa- receptors may play a role in the modulation of nociception under chronic pain.(ABSTRACT TRUNCATED AT 400 WORDS)" @default.
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• W1993474313 title "Intermediate filaments in smooth muscle tumours" @default.
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• W1993474313 doi "https://doi.org/10.1136/jcp.36.1.57" @default.
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