The immature mammary glands of BALB/c female mice were treated with 7,12-dimethylbenz[a]anthracene (DMBA), 2 micrograms/ml, or 3-methylcholanthrene (10 micrograms/ml) for a 24-hr period at different times during the inital six days of lobuloalveolar growth in hormone-supplemented organ culture. Nodule-like alveolar lesions (NLAL) were detectable in 80% of the glands treated with DMBA (40% in 3-...

The results of a joint computational and experimental study of the cyclometallation reactions of dimethylbenzylamine (DMBA-H) with [IrCl(2)Cp*](2) and a range of chelating bases are presented. With acetate, density functional theory calculations on the key intermediate, [Ir(DMBA-H)(kappa(2)-OAc)Cp](+), define a two-step C-H activation process involving initial kappa(2)-kappa(1) displacement of ...

The current study was designed to evaluate the effects of oral administration of the citrus coumarin, isopimpinellin, on skin tumor initiation by topically applied benzo[a]pyrene (B[a]P) and 7,12-dimethylbenz[a]anthracene (DMBA). To evaluate the effects of orally administered isopimpinellin on skin tumor initiation by B[a]P and DMBA, its effects on DNA adduct formation were first evaluated. Fem...

Multiple intravenous injections of an emulsion containing 7,12-dimethylbenz(a)anthracene (DMBA) or 7,8,12-trimethylbenz(a)anthracene (TMBA) induce a high incidence of leukemia in rats. Twenty-four hours after a single injection, about half of the metaphase cells in the marrow have chromosomes with breaks. Although breaks were inflicted on chromosomes of various sizes and morphology, these aberr...

Induction of apoptosis is one of the most active strategies in cancer chemoprevention and the ability of medicinal plants in this regard has attracted major research interest. The present study was designed to investigate the apoptosis inducing capacity of an ethanolic neem leaf extract (ENLE) during 7,12-dimethylbenz[a]anthracene (DMBA)-induced hamster buccal pouch carcinogenesis using the apo...

p53 Reactivation and induction of massive apoptosis (PRIMA-1) is a small-molecule compound that reactivates mutant p53, restoring its normal tumor suppressor function. PRIMA-1 effectively suppresses the growth of homogeneous p53-deficient tumor xenografts in immunosuppressed mice; however, the ability of PRIMA-1 to suppress the growth of mammary tumors in rodents and other species is not well c...

This study analyzed the effectiveness of a nonsteroidal antiestrogen, cis-(3-[p-(1,2,3,4-tetrahydro-6-methoxy-2-phenyl-1-naphthyl)phenoxy]-1,2-propanediol (U 23,469) previously shown to be potent in antagonizing estrogen-induced uterine growth, in preventing the development of 7,12-dimethylbenz(a)anthracene (DMBA)-induced rat mammary tumors and in eliciting the regression of established tumors;...

Ung thư vú là loại ung phổ biến nhất ở phụ nữ. Gần đây, bên cạnh các phương pháp điều trị cổ điển, dược liệu và y học truyền đang trở nên ngày càng trong hỗ trợ ngăn ngừa thư. Nghiên cứu này nhằm đánh giá tác động của cao chiết từ vỏ quả măng cụt (Garcinia mangostana L.) trên mô hình bệnh do 7,12-dimethylbenzeneanthracene (DMBA) chuột nhắt cái. Chuột cái chủng Swiss, trưởng thành được cho uống ...