Gamma-glutamyltransferase activity in mammary gland of pregnant rats and its regulation by ovarian hormones, prolactin and placental lactogen.

نویسندگان

  • L E Bussmann
  • R P Deis
چکیده

Ovariectomy and ovariectomy plus hysterectomy on day 18 of pregnancy increased gamma-glutamyltransferase activity in the mammary gland. The withdrawal of progesterone and the subsequent release of prolactin are responsible for the rise in enzyme activity. Rat placental lactogen in the absence of prolactin and progesterone is able to induce gamma-glutamyltransferase activity.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Effects of prolactin withdrawal on activity of pyruvate dehydrogenase of rat mammary gland.

After the placenta is lost at parturition the concentration of placental lactogen in the blood declines rapidly (Grumbach et al., 1968), whereas that of prolactin shows a compensatory increase. I assume that this switch in lactogenic hormone results in a fall in ‘anti-insulin’ activity, a situation which would occur if either the serum concentration of prolactin were lower than that of placenta...

متن کامل

Isolation, purification, and characterization of mouse placental lactogen.

Mouse placental lactogen was purified 1840-fold from BALB/c placentae from days 14-18 of gestation with an overall yield of 29%. The purification procedure included alkaline homogenization and extraction, ammonium sulfate precipitation, hydrophobic interaction chromatography on Phenyl-Sepharose, ion-exchange chromatography on CM- and DEAE-cellulose, and gel exclusion chromatography on Sephadex ...

متن کامل

Reaction of the histidines of prolactin with ethoxyformic anhydride. A binding site modification.

The seven histidines of bovine prolactin were modified with ethoxyformic anhydride and two classes of reactivity were apparent: 5 histidines were in the more reactive class (k = 0.097 min-1) and 2 histidines were less reactive (k = 0.011 min-1). The activity of the modified prolactins was determined by measuring their ability to bind to prolactin receptors from rabbit mammary glands. This assay...

متن کامل

P-188: Mammary Gland Changes during Chlorpromazine Treatment in Female Rats

Background: Antipsychotic drugs are medications used to treat schizophrenia and other psychotic disorders. Antipsychotic drugs can cause unwanted side effects. Hyperprolactinemia is an important but neglected adverse effect. The aim of the this study was to consider the effects of Chlropromazine -induced hyperprolactinaemia on mammary glands of female rats . Materials and Methods: In this study...

متن کامل

Localization and specificity of binding of subprimate placental lactogen in rabbit tissues.

A search for specific placental lactogen binding was undertaken in tissues obtained from late pregnant rabbits using the placental lactogens from sheep, cows, and human beings. 125I-labeled ovine lactogen exhibited highest specific binding to the adrenal gland (57.8%), followed by liver (21.5%), ovary (19.9%), mammary gland (15.9%), uterus (12.2%), kidney (8.8%), brain (8.5%), and adipose tissu...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • The Biochemical journal

دوره 223 1  شماره 

صفحات  -

تاریخ انتشار 1984