title: Effect of the association of 1-methyl-DL-tryptophan with paclitaxel on the expression of indoleamine 2,3-dioxygenase in cultured cancer cells from patients with breast cancer.
abstract: Breast cancer is the most common type of cancer among women and the survival of patients affected by it is increasing, mainly due to several new approaches in early diagnosis and more effective treatments. The enzyme indoleamine 2,3-dioxygenase (IDO) is expressed in many cells, including tumor cells. IDO acts by inhibiting the proliferation of T lymphocytes, thus compromising their cytotoxic activity. 1-Methyl-DL-tryptophan (1MT) is a competitive inhibitor of IDO, which blocks its immunosuppressive effect. Paclitaxel is an antineoplastic drug largely used in breast cancer therapy. Thus, this study aimed to determine the in vitro effect of the association of 1MT and paclitaxel chemotherapy, as an approach to reduce tumor growth. It is believed that this would allow the restoration of T lymphocyte proliferation capability and its cytotoxic response. The supplemented cultures showed that the most significant differences in the expression of IDO were observed in the group treated with paclitaxel associated with 1-MT continuous supplementation, reducing enzyme expression from 12.06 to 3.56 %. This association was more effective in reducing IDO expression and could collaborate in developing a new therapeutic strategy for breast cancer treatment.
authors.affiliation: Anatomy Section, Department of Surgery, School of Veterinary Medicine and Animal Sciences, University of São Paulo, Av. Prof. Dr. Orlando Marques Paiva 87, Butantã, São Paulo, SP, 05508-270, Brazil.
authors.forename: Maria Letícia Baptista
authors.initials: ML
authors.lastname: Salvadori
authors.affiliation: Anatomy Section, Department of Surgery, School of Veterinary Medicine and Animal Sciences, University of São Paulo, Av. Prof. Dr. Orlando Marques Paiva 87, Butantã, São Paulo, SP, 05508-270, Brazil.
authors.forename: Pedro Kastein Faria
authors.initials: PK
authors.lastname: da Cunha Bianchi
authors.affiliation: Department of Tocogynecology, Federal University of Sao Paulo, Rua Botucatu, 740. Vila Clementino, São Paulo, SP, 04023900, Brazil.
authors.forename: Luiz Henrique
authors.initials: LH
authors.lastname: Gebrim
authors.affiliation: Anatomy Section, Department of Surgery, School of Veterinary Medicine and Animal Sciences, University of São Paulo, Av. Prof. Dr. Orlando Marques Paiva 87, Butantã, São Paulo, SP, 05508-270, Brazil.
authors.forename: Renata Santos
authors.initials: RS
authors.lastname: Silva
authors.affiliation: Anatomy Section, Department of Surgery, School of Veterinary Medicine and Animal Sciences, University of São Paulo, Av. Prof. Dr. Orlando Marques Paiva 87, Butantã, São Paulo, SP, 05508-270, Brazil. jrobertok@usp.br.
authors.forename: José Roberto
authors.initials: JR
authors.lastname: Kfoury
mesh_terms: D000972:Antineoplastic Agents, Phytogenic / Q000008:administration & dosage*; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000008:administration & dosage; D001943:Breast Neoplasms / Q000201:enzymology*; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D050503:Indoleamine-Pyrrole 2,3,-Dioxygenase / Q000037:antagonists & inhibitors* / Q000378:metabolism; D017239:Paclitaxel / Q000008:administration & dosage*; D014364:Tryptophan / Q000008:administration & dosage / Q000031:analogs & derivatives*; D014407:Tumor Cells, Cultured
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D050503:Indoleamine-Pyrrole 2,3,-Dioxygenase; D014364:Tryptophan; D017239:Paclitaxel; C525396:1-methyltryptophan
keywords: Cancer-associated therapy; Flow cytometry; IDO; In vitro treatment; Taxol®; Tryptophan catabolism