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Canine mammary gland tumors (CMGTs) are the most frequent types of cancer in bitches and proposed as a model of human breast cancer. The anticancer effect of curcumin on human breast cancer has been extensively studied. The aim of this study was to evaluate the therapeutic effect of curcumin in two different histologies (simple carcinoma [SC] and squamous cell carcinoma [SCC]) of CMGTs. Primary canine mammary cells were isolated from the tumoral tissues surgically resected from two bitches (Case 1 and Case 2). Cell viability, apoptotic percentage, cell cycle progression and the changes in the cell morphology were evaluated. Curcumin inhibited the growth of both SC (Case 1) and SCC (Case 2) cells. However, Case 1 cells (43.48% ± 3.87% at 0.5 µM) were more sensitive to curcumin than Case 2 cells (59.36% ± 2.09% at 0.5 µM). Curcumin induced total apoptotic cell death through G0/G1 arrest, and this effect was more profound in Case 1 cells. Furthermore, cytoplasmic vacuolization, apoptotic bodies and membrane blebbing were observed in both cells following curcumin treatment. Our findings provide a novel approach for the effects of curcumin as a natural compound on CMGTs. Further investigations should be performed to investigate the molecular mechanisms of the differences in curcumin efficacy for different histological subtypes.

Evaluation of Curcumin Therapeutic Effects on Histological Subtypes of Canine Mammary Gland Tumours