A group of chemicals that have proved to be frequent causes of allergic contact dermatitis from applied ingredients of the vehicle. Fisher (1971) testing with a vehicle tray of 15 chemicals in 100 patients with allergic contact dermatitis due to topically administered medications found 30 positive patch test reactions of patients and reported that most important sensitiiing chemicals are Ethylenediamine, Lanolin, Farabens, Phenylmercuric acid, and. propylene glycol monostearate. These chemicals have been recognized as such common sensitizers that they are nonincluded. in the standard patch test series by many countries. From the standpoint of allergenicity of topical preparations including topical medicaments and cosmetics, prevention and diagnostic procedures of dermatitis should be investigated extensively through the patch test studies. But, in our country, there has only a few investigation conceming the dermatitis from vehicle, particularly the medicaments and cosmetics. Therefore, author has tried to establish the vehicle tray fitted to our country according to the basic consideration used with the vehicle patch test tray of Fisher. 100 patients suspected of having allergic contct dermatitis due to topical medication or cosmetics were patch tested with a group of chemicals composed of substances commonly found in vehicles of current topical medications or cosmetics. There were many significant reactions to Ethylenediamine, Paraben, Lanolin, Sodium lauryl sulfate, Polyethylene glycol and Turpentine which play a significant role as solubilzer, antioxidants, emulsifieis, exirpients, preservatives, stabilizers, and surfactants. Author proposed that a group of chemicals should be patch tested on patients of allergic contact dermatitis for the establishmc,nt and development of the hypoallergenic topical medicaments or cosmetics.
Antioxidants ; Dermatitis ; Dermatitis, Allergic Contact* ; Humans ; Lanolin ; Patch Tests ; Polyethylene Glycols ; Propylene Glycol ; Sodium Dodecyl Sulfate ; Surface-Active Agents ; Turpentine

The elimination half-lives of in Interleukin-6 (IL-6) and cytokine-induced neutrophil chemoattractant-1 (CINC-1) in rats after inflammatory stimulation were investigated. Five male Sprague-Dawley rats were used (age, 9 weeks; body weight, 235–375 g). Turpentine oil was intramuscularly injected at a dose of 2 mL/kg body weight to induce acute inflammation. Blood was collected pre-injection and 6, 12, 24, 36, 48, 60, 72, 84, and 96 h after the turpentine oil injection. Serum concentrations of IL-6, CINC-1, and α₂-macroglobulin (α2M) were measured by enzyme-linked immunosorbent assay. Half-lives were calculated as 0.693/elimination rate constant. The serum concentration of α2M peaked at 48 h after turpentine oil injection. Serum concentrations of IL-6 and CINC-1 increased and peaked at 12 and 24 h, respectively. The terminal elimination half-lives of IL-6 and CINC-1 were 15.5 and 29.9 h, respectively. The half-life of CINC-1 was significantly longer than that of IL-6 (P=0.006). These results suggested that these cytokines synthesized in response to inflammatory stimulation were rapidly eliminated in rats. The serum concentrations of these cytokines should be measured at an early stage if these cytokines will be used as surrogate inflammatory markers instead of acute-phase proteins.
Acute-Phase Proteins ; Animals ; Body Weight ; Cytokines ; Enzyme-Linked Immunosorbent Assay ; Half-Life ; Humans ; Inflammation ; Interleukin-6* ; Male ; Neutrophils* ; Rats* ; Rats, Sprague-Dawley ; Turpentine

OBJECTIVETo investigate the involvement of transient receptor potential vanilloid receptor 1 (TRPV1) in the facial inflammatory pain in relation to thermal hyperalgesia and cold pain sensation.

METHODSFacial inflammatory pain model was developed by subcutaneous injection of turpentine oil (TO) into rat facial area. Head withdrawal thermal latency (HWTL) and head withdrawal cold latency (HWCL) were measured once a day for 21 d after TO treatment using thermal and cold measurement apparatus. The immunohistochemical staining, cell-size frequency analysis and the survey of average optical density (OD) value were used to observe the changes of TRPV1 expression in the neurons of the trigeminal ganglion (TG), peripheral nerve fibers in the vibrissal pad, and central projection processes in the trigeminal sensory nuclei caudalis (Vc) on day 3, 5, 7, 14, and 21 after TO injection.

RESULTSHWTL and HWCL decreased significantly from day 1 to day 14 after TO injection with the lowest value on day 5 and day 3, respectively, and both recovered on day 21. The number of TRPV1-labeled neurons increased remarkably from day 1 to day 14 with a peak on day 7, and returned back to the normal level on day 21. In control rats, only small and medium-sized TG neurons were immunoreactive (IR) to TRPV1, and the TRPV1-IR terminals were abundant in both the vibrissal pad and the Vc. Within 2 weeks of inflammation, the expression of TRPV1 in small and medium-sized TG neurons increased obviously. Also the TRPV1 stained terminals and fibers appeared more frequent and denser in both the vibrissal pad skin and throughout laminae I and the outer zone of laminae II (IIo) of Vc.

CONCLUSIONFacial inflammatory pain could induce hyperalgesia to noxious heat and cold stimuli, and result in increase of the numbers of TRPV1 positive TG neurons and the peripheral and central terminals of TG. These results suggest that the phenotypic changes of TRPV1 expression in small and medium-sized TG neurons and terminals might play an important role in the development and maintenance of TO-induced inflammatory thermal hyperalgesia and cold pain sensation.

Animals ; Cold Temperature ; Facial Pain ; chemically induced ; metabolism ; physiopathology ; Hot Temperature ; Immunohistochemistry ; Male ; Neurons ; cytology ; metabolism ; Pain Threshold ; physiology ; Rats ; Rats, Sprague-Dawley ; Statistics, Nonparametric ; TRPV Cation Channels ; metabolism ; Thermosensing ; physiology ; Trigeminal Ganglion ; cytology ; metabolism ; Turpentine ; administration & dosage