Immunohistochemical expression of B and T-lymphocytes and TGF-beta in experimentally transplanted canine venereal tumor
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Data
2009-07-01
Autores
Trompieri-Silveira, Ana Carolina [UNESP]
Gerardi, Daniel [UNESP]
Mouro, Juliana Vitti [UNESP]
Costa, Mirela Tinucci [UNESP]
Alessi, Antonio Carlos [UNESP]
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Editor
Universidade Federal de Santa Maria (UFSM)
Resumo
A relação tumor/hospedeiro pode ter um papel determinante na progressão ou remissão de um tumor. Uma maior infiltração de leucócitos nos tumores tem sido associada a um melhor prognóstico. Entretanto, o papel central dessas células na imunidade antitumoral ainda é controverso. O tumor venéreo transmissível (TVT) canino é um tumor transplantável experimentalmente e tem sido utilizado como modelo experimental da relação tumor versus hospedeiro. O objetivo deste estudo foi avaliar a infiltração de linfócitos T (CD3, CD4, CD8), B (CD79-α) e a expressão da citocina TGF-β no TVT por meio da imunoistoquímica (método ABC). Os grupos experimentais foram constituídos por filhotes de cães que desenvolveram o TVT após transplantação nas fases de progressão (n=8) (Grupo 1a), latência (n=8) (Grupo 1b) e regressão (n=8) (Grupo 1c) do tumor. Os linfócitos T CD3+ predominaram nas fases de progressão e regressão em relação à fase de latência. Os linfócitos T CD4+ e CD8+ apresentaram predomínio na fase de progressão e menor expressividade na fase de regressão. Os linfócitos B estavam em maior quantidade na fase de regressão e foram pouco expressivos na fase de progressão. O TGF-β foi igualmente expressivo nas fases do TVT transplantado.
The tumor/host relationship may have a determining role in the progression or remission of a tumor. Greater infiltration of leukocytes into tumors has been associated with a better prognosis, although controversy regarding whether these cells have a central role in antitumor immunity still exists. Canine transmissible venereal tumor (TVT) is an experimentally transplantable type of tumor that has been used as an experimental model for the tumor/host relationship. The aim of this study was to evaluate the infiltration of T-lymphocytes (CD3, CD4, CD8) and B lymphocytes (CD79-α) and the expression of the cytokine TGF-β in TVT, by means of immunohistochemistry (ABC method). The experimental tumors were composed of puppies that developed TVT after transplantation, in the progression (n=8) (Group 1a), latency (n=8) (Group 1b) and regression (n=8) (Group 1c) phases of the tumor. CD3+ T-lymphocytes predominated in the progression and regression phases, in relation to the latency phase. CD4+ and ¹CD8+ T-lymphocytes were predominant in the progression phase, and with lower expression in the regression phase. The greatest quantities of B-lymphocytes were in the regression phase, with restricted expression in the progression phase. TGF-β was expressed equally in the phases of the transplanted TVT.
The tumor/host relationship may have a determining role in the progression or remission of a tumor. Greater infiltration of leukocytes into tumors has been associated with a better prognosis, although controversy regarding whether these cells have a central role in antitumor immunity still exists. Canine transmissible venereal tumor (TVT) is an experimentally transplantable type of tumor that has been used as an experimental model for the tumor/host relationship. The aim of this study was to evaluate the infiltration of T-lymphocytes (CD3, CD4, CD8) and B lymphocytes (CD79-α) and the expression of the cytokine TGF-β in TVT, by means of immunohistochemistry (ABC method). The experimental tumors were composed of puppies that developed TVT after transplantation, in the progression (n=8) (Group 1a), latency (n=8) (Group 1b) and regression (n=8) (Group 1c) phases of the tumor. CD3+ T-lymphocytes predominated in the progression and regression phases, in relation to the latency phase. CD4+ and ¹CD8+ T-lymphocytes were predominant in the progression phase, and with lower expression in the regression phase. The greatest quantities of B-lymphocytes were in the regression phase, with restricted expression in the progression phase. TGF-β was expressed equally in the phases of the transplanted TVT.
Descrição
Palavras-chave
Lymphocytes, TVT, Immunohistochemistry, Dog, Linfócitos, TVT, Imuno-histoquímica, Cão
Como citar
Ciência Rural. Universidade Federal de Santa Maria (UFSM), v. 39, n. 4, p. 1148-1154, 2009.