Találati lista | Tudóstér

001-es BibID:	BIBFORM048492
Első szerző:	Szállási Árpád (pathológus)
Cím:	Duration of desensitization and ultrastructural changes in dorsal root ganglia in rats treated with resiniferatoxin, an ultrapotent capsaicin analog / Arpad Szallasi, Ferenc Joo, Peter M. Blumberg
Dátum:	1989
ISSN:	0006-8993
Megjegyzések:	We have previously demonstrated resiniferatoxin (RTX) to be an ultrapotent analog of capsaicin. Like capsaicin, RTX initially induces neurogenic inflammation, pain, and hypothermia and then causes desensitization of these responses. We examine here the duration of desensitization following acute treatment with the maximal tolerated dose of RTX. Desensitization to neurogenic inflammation began to diminish by 7 days, whereas desensitization to pain and to induction of hypothermia persisted for several weeks. Interestingly, a partial hypothermic response returned within 24 h if challenge was with RTX at 500-fold its ED50 for control animals; the animals, moreover, maintained their ability to thermoregulate in a hot environment. The time course of the morphological changes--ultrastructure and calcium staining--of dorsal root ganglion neurons was examined in parallel. The ultrastructural changes were evident by 4 h and persisted for the duration of the experiments. Limited calcium staining was visible at 12 and 24 h after treatment but then diminished. In comparison with capsaicin treatment, RTX caused more long-lasting desensitization as well as a distinct spectrum of response.
Tárgyszavak:	Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban Dorsal root ganglion Resiniferatoxin Capsaicin analog Desensitization
Megjelenés:	Brain research. - 503 : 1 (1989), p. 68-72. -
További szerzők:	Joó Ferenc (1949-) (vegyész) Blumberg, Peter M.
Internet cím:	Szerző által megadott URL Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Saját polcon:

001-es BibID:	BIBFORM048498
Első szerző:	Szolcsányi János (Pécs)
Cím:	Resiniferatoxin: an ultrapotent selective modulator of capsaicin-sensitive primary afferent neurons / Janos Szolcsanyi, Arpad Szallasi, Zoltan Szallasi, Ferenc Joo, Peter M. Blumberg
Dátum:	1990
Megjegyzések:	Resiniferatoxin (RTX) has been shown to function as an ultrapotent analog of capsaicin. It is reported here that RTX, like capsaicin, acts selectively on primary sensory neurons in rats to produce ultrastructural alterations and calcitonin gene-related peptide depletion. To evaluate RTX actions on capsaicin-sensitive nociceptors of vagal origin in the lung, the activation and desensitization of the pulmonary chemoreflex in both rats and cats were examined. In rats, RTX (2 ng-5 micrograms/kg i.v.) failed to elicit the full reflex triad (apnea, systemic hypotension and bradycardia); RTX did, however, desensitize the pulmonary chemosensitive receptors to capsaicin and phenyldiguanide. This effect is not achievable upon acute capsaicin treatment. RTX pretreatment (300 micrograms/kg s.c.) of rats also abolished the neurogenic edema formation, another response mediated via capsaicin-sensitive vagal fibers, in rat trachea to challenge either by capsaicin or ether. The effect of electrical stimulation of vagal nerve was not impaired after RTX injection, indicating that RTX desensitized only the capsaicin-sensitive pathway whereas the parasympathetic pathway remained unaltered. In cats, unlike in the rat, the full pulmonary chemoreflex occurred in response to 0.1 micrograms/kg RTX. It is concluded that RTX is a selective probe for capsaicin-sensitive neural pathways but the spectrum of action of the two compounds is not identical. The failure of RTX to provoke the pulmonary chemoreflex in the rat, which is the main limiting factor in the use of capsaicin, suggests a further advantage to the use of RTX for probing capsaicin-sensitive neural pathways.PMID: 2243359
Tárgyszavak:	Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban Desensitization
Megjelenés:	The Journal of pharmacology and experimental therapeutics. - 255 : 2 (1990), p. 923-928. -
További szerzők:	Szállási Árpád (1960-) (pathológus) Szállási Zoltán Joó Ferenc (1949-) (vegyész) Blumberg, Peter M.
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Saját polcon: