calcipotriene and diflorasone

It has been indicated that the sphingolipid sphingosine-1-phosphate (S1P) restrains the ability of dendritic cells to migrate to lymph nodes. Furthermore S1P has been demonstrated to inhibit cell growth in human keratinocytes. However, only little is known about the effect of S1P in hyperproliferative and inflammatory in vivo models.. In this study, locally acting S1P was explored in different experimental mouse models of psoriasis vulgaris.. S1P and FTY720 were tested in the imiquimod-induced psoriasis mouse model, the mouse tail assay and a pilot study of the severe combined immunodeficiency mice (SCID).. In the imiquimod model the positive control diflorasone diacetate and S1P, but not FTY720 reduced the imiquimod-induced epidermal hyperproliferation of the ear skin. This effect was confirmed in the SCID model, where S1P treated skin from patients suffering from psoriasis showed a decrease in epidermal thickness compared to vehicle. In the imiquimod model, there was also significant inhibition of ear swelling and a moderate reduction of inflammatory cell influx and oedema formation in ear skin by S1P treatment. The inflammatory response on the back skin was, however, only reduced by diflorasone diacetate. In the mouse tail assay, the influence of S1P and FTY720 in stratum granulosum formation was tested compared to the positive control calcipotriol. Whereas topical administration of calcipotriol led to a low but significant increase of stratum granulosum, S1P and FTY720 lacked such an effect.. Taken together, these results imply that topical administration of S1P might be a new option for the treatment of mild to moderate psoriasis lesions.

Topics: Administration, Cutaneous; Aminoquinolines; Animals; Anti-Inflammatory Agents; Betamethasone; Calcitriol; Cell Differentiation; Cell Proliferation; Dermatologic Agents; Disease Models, Animal; Female; Fingolimod Hydrochloride; Humans; Imiquimod; Keratinocytes; Local Lymph Node Assay; Lysophospholipids; Mice; Mice, Inbred BALB C; Mice, SCID; Propylene Glycols; Psoriasis; Receptors, Lysosphingolipid; Skin; Skin Transplantation; Sphingosine; Sphingosine-1-Phosphate Receptors; Time Factors

Tazarotene is the first receptor-selective retinoid indicated for the topical treatment of plaque psoriasis. It is being used clinically in combination with other topical antipsoriatic treatments, although its stability in the presence of these products has not been examined extensively. This study examines the compatibility of tazarotene 0.05% gel with 17 other topical products used in the treatment of psoriasis, assessed over a 2-week period. Tazarotene showed minimal degradation (<10%) at 0, 8, 24, and 48 hours after compounding with each of the 17 products. In addition, after 1 and 2 weeks, degradation of tazarotene remained less than 10% for 15 of the 17 products tested. Tazarotene appeared to have minimal impact on the stability of the other products. These results suggest that tazarotene gel can be successfully coprescribed with a range of commonly used topical psoriasis treatments without adversely affecting the chemical stability of either agent.

Topics: Administration, Topical; Betamethasone; Calcitriol; Clobetasol; Dermatologic Agents; Drug Evaluation, Preclinical; Drug Incompatibility; Fluocinonide; In Vitro Techniques; Mometasone Furoate; Nicotinic Acids; Pregnadienediols; Psoriasis