Insulin-induced up-regulation of lipoprotein lipase messenger ribonucleic acid and activity in mammary gland.

Abstract:

:The effects of insulin on lipoprotein lipase (LPL) messenger RNA (mRNA) were studied in mammary glands from virgin and late-pregnant rats. Virgin and pregnant rats (at 17 days of gestation) were subjected to a continuous infusion (35 ml/day) with 50% glucose for 72 h to produce a prolonged hyperinsulinemic-euglycemic condition. Gestation causes a 4-fold increase in LPL mRNA accompanied by a 3- to 4-fold increase in total LPL activity. Experimental hyperinsulinemia, generated by the 50% glucose infusion, had a similar effect in both pregnant and virgin rats, by enhancing (2- to 3-fold) both their LPL activity and LPL mRNA. Thus, total LPL activity and LPL mRNA significantly correlated with plasma insulin (r = 0.789, P < 0.001; and r = 0.772, P < 0.001, respectively). Furthermore, total LPL activity was correlated with LPL mRNA (r = 0.765, P = 0.001). In conclusion, the present study shows that insulin participates in the control of LPL expression in mammary glands, revealing its role as a modulator of the enzyme at a mRNA level.

journal_name

Endocrinology

journal_title

Endocrinology

authors

Ramos P,Martín-Hidalgo A,Herrera E

doi

10.1210/endo.140.3.6565

subject

Has Abstract

pub_date

1999-03-01 00:00:00

pages

1089-93

issue

3

eissn

0013-7227

issn

1945-7170

journal_volume

140

pub_type

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