title: Influence of phototherapy in psoriasis on Ki-67 antigen expression: a preliminary study.
abstract: Antigen Ki-67 is a non-histone nuclear protein, closely connected with cell proliferation. Determining Ki-67 allows for a quick and reliable evaluation of the growth fraction of the studied cell population. It serves as a marker of proliferative activity in neoplasms and other diseases with excessive cell proliferation such as psoriasis. Evaluation of Ki-67 expression in epidermal cells was performed in 10 individuals suffering from plaque psoriasis, before and after one of three methods of phototherapy: broadband UVB, narrowband UVB or PUVA. We observed increased Ki-67 antigen expression in psoriatic lesions. The percentage of Ki-67 positive nuclei in the epidermis affected by the disease ranged from 0 to 30% and in the macroscopically healthy surrounding tissue the percentage was from 0 to 10%. After phototherapy the expression in lesional skin decreased (p < 0.01). The greatest decrease was observed after the application of PUVA therapy (from 25 to 10% of cells, p < 0.05). No significant differences were observed in the perilesional skin with regard to Ki-67 antigen expression before or after phototherapy. On the basis of our own study and studies conducted by other researchers, it can be concluded that reduced Ki-67 expression after the application of PUVA and UVB therapies in the psoriatic epidermis is not a characteristic result of phototherapy only. It is a characteristic property of any effective psoriasis therapy.
authors.affiliation: Dorota Jesionek-Kupnicka, Department of Pathology, Chair of Oncology, Medical University of Łódź, Pomorska 251, 92-213 Łódź, Poland, tel. +48 42 675 76 43, fax +48 42 272 56 04, e-mail: dorota.jesionek-kupnicka@umed.lodz.pl.
authors.forename: D
authors.initials: D
authors.lastname: Jesionek-Kupnicka
authors.forename: D
authors.initials: D
authors.lastname: Chomiczewska-Skóra
authors.forename: H
authors.initials: H
authors.lastname: Rotsztejn
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D019394:Ki-67 Antigen / Q000032:analysis / Q000096:biosynthesis*; D008297:Male; D008875:Middle Aged; D010789:Phototherapy / Q000379:methods; D011565:Psoriasis / Q000378:metabolism* / Q000628:therapy*; D055815:Young Adult
chemical_list: D019394:Ki-67 Antigen