Biomaterial Database

Peroxidase activity in the rat breast tissue as a marker of estrogen action. 1979

A P Banerji, and S Dutta

Peroxidase activity and its inducibility by estrogen in the uterine and breast tissues of Holtzman rats varied with the age of animals. Basal proxidase level of the two tissues was low in immature and high in older animals. Estrogen induced significant peroxidase activity in the uteri of rats up to 56 days of age and thereafter the uterine response was poor. Though the breast tissue peroxidase response to estrogen was significant in 20-160 days old female rats, greater inducibility being noted between 40-90 days of age. Among the sex steroids, only estrogen could induce the enzyme in the breast tissue in a dose dependent way. Peroxidase was also induced appreciably in the male breast tissue to an extent observed in age-matched females. It is suggested that this enzyme could be regarded as a diagnostic end point of estrogen action in the rat breast tissue.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D008321	Mammary Glands, Animal	MAMMARY GLANDS in the non-human MAMMALS.	Mammae,Udder,Animal Mammary Glands,Animal Mammary Gland,Mammary Gland, Animal,Udders
D009132	Muscles	Contractile tissue that produces movement in animals.	Muscle Tissue,Muscle,Muscle Tissues,Tissue, Muscle,Tissues, Muscle
D010544	Peroxidases		Ovoperoxidase
D011374	Progesterone	The major progestational steroid that is secreted primarily by the CORPUS LUTEUM and the PLACENTA. Progesterone acts on the UTERUS, the MAMMARY GLANDS and the BRAIN. It is required in EMBRYO IMPLANTATION; PREGNANCY maintenance, and the development of mammary tissue for MILK production. Progesterone, converted from PREGNENOLONE, also serves as an intermediate in the biosynthesis of GONADAL STEROID HORMONES and adrenal CORTICOSTEROIDS.	Pregnenedione,Progesterone, (13 alpha,17 alpha)-(+-)-Isomer,Progesterone, (17 alpha)-Isomer,Progesterone, (9 beta,10 alpha)-Isomer
D003609	Dactinomycin	A compound composed of a two CYCLIC PEPTIDES attached to a phenoxazine that is derived from STREPTOMYCES parvullus. It binds to DNA and inhibits RNA synthesis (transcription), with chain elongation more sensitive than initiation, termination, or release. As a result of impaired mRNA production, protein synthesis also declines after dactinomycin therapy. (From AMA Drug Evaluations Annual, 1993, p2015)	Actinomycin,Actinomycin D,Meractinomycin,Cosmegen,Cosmegen Lyovac,Lyovac-Cosmegen,Lyovac Cosmegen,Lyovac, Cosmegen,LyovacCosmegen
D004790	Enzyme Induction	An increase in the rate of synthesis of an enzyme due to the presence of an inducer which acts to derepress the gene responsible for enzyme synthesis.	Induction, Enzyme
D004967	Estrogens	Compounds that interact with ESTROGEN RECEPTORS in target tissues to bring about the effects similar to those of ESTRADIOL. Estrogens stimulate the female reproductive organs, and the development of secondary female SEX CHARACTERISTICS. Estrogenic chemicals include natural, synthetic, steroidal, or non-steroidal compounds.	Estrogen,Estrogen Effect,Estrogen Effects,Estrogen Receptor Agonists,Estrogenic Agents,Estrogenic Compounds,Estrogenic Effect,Estrogenic Effects,Agents, Estrogenic,Agonists, Estrogen Receptor,Compounds, Estrogenic,Effects, Estrogen,Effects, Estrogenic,Receptor Agonists, Estrogen
D005260	Female		Females
D000375	Aging	The gradual irreversible changes in structure and function of an organism that occur as a result of the passage of time.	Senescence,Aging, Biological,Biological Aging