Mouse placental lactogen-I: RIA and gestational profile in maternal serum.

Abstract:

:A RIA for mouse placental lactogen-I (mPL-I) was developed using recombinant mPL-I as the standard, radioligand, and antigen for antiserum production. Displacement curves for dilutions of serum and placental extracts from pregnant mice were parallel to the recombinant mPL-I standard curve. Serum from male and nonpregnant female mice and high concentrations of mouse PRL, GH, PL-II, proliferin, and proliferin-related protein did not cross-react in the assay. mPL-I appeared in maternal serum on day 6 of pregnancy. Its concentration remained low until day 8 and them increased to a very large peak on days 9-11 (maximum concentration, approximately 8 micrograms/ml). The mPL-I concentration declined after day 11, but the hormone could be detected at low concentration in maternal serum until the end of pregnancy. On day 10 of pregnancy, the mPL-I concentration of maternal serum was correlated with litter size. Fractionation of serum from 10-day pregnant mice by size exclusion chromatography indicated the absence of high mol wt forms of mPL-I in the circulation.

journal_name

Endocrinology

journal_title

Endocrinology

authors

Ogren L,Southard JN,Colosi P,Linzer DI,Talamantes F

doi

10.1210/endo-125-5-2253

subject

Has Abstract

pub_date

1989-11-01 00:00:00

pages

2253-7

issue

5

eissn

0013-7227

issn

1945-7170

journal_volume

125

pub_type

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