Multiple forms of glucose-adenosine triphosphate phosphotransferase in rat mammary gland.
Measurements have been made of the total hexokinase activity and of the relative amounts of types I and II hexokinase in rat mammary gland and at different stages of the lactation cycle. The total hexokinase activity increased during lactation, that of type II increasing to a greater extent than that of type I; the type II/type I activity ratio rose from a pregnancy value of about 1 to a mid-lactation value of 3, returning to 1 on involution. The changes in type II hexokinase activity during the lactation cycle parallel the changes in the insulin sensitivity of mammary-gland tissue. A study of the effect of alloxan-diabetes on mammary-gland hexokinase during the mid-lactation period revealed that, although the total glucose-phosphorylating capacity of the mammary gland was almost unchanged, the relative contributions of type I and type II hexokinases altered, decreasing the type II/type I activity ratio to about 1.
D000818:Animals; D003921:Diabetes Mellitus, Experimental / Q000150:complications*; D004586:Electrophoresis; D005260:Female; D005941:Glucokinase / Q000378:metabolism*; D006593:Hexokinase / Q000378:metabolism*; D007774:Lactation; D008321:Mammary Glands, Animal / Q000201:enzymology*; D010085:Oxidative Phosphorylation; D011247:Pregnancy; D011270:Pregnancy, Animal; D051381:Rats; D013053:Spectrophotometry
D006593:Hexokinase; D005941:Glucokinase