Early postnatal development in the rat is characterized by accumulation of highly unsaturated triacylglycerols.

Abstract:

:Our objective was to determine the quantitative changes of individual triacylglycerol (TG) species in liver and carcass during early postnatal growth. Pregnant rats were killed at d 21 of pregnancy, and neonatal rats were killed at d 3 or 9 after birth. Quantitative changes in fatty acids and TG species of fetal/neonatal liver and carcass were determined using capillary gas liquid chromatography. At postnatal d 3 or 9 compared with fetal d 21, total carcass TG increased 11- to 12-fold, with nonessential fatty acids increasing 8- to 9-fold, n-6 essential fatty acids (EFA) increasing 34- to 44-fold, and n-3 EFA increasing 19- to 29-fold, respectively. Total neonatal liver TG increased 13-fold from fetal d 21 to postnatal d 3, with a 6-fold increase in non-EFA, a 34-fold increase in total n-6 EFA and a 65-fold increase in total n-3 EFA. At postnatal d 3 compared with fetal d 21, larger molecular weight liver TG classes (C56-C64) increased 68-fold, followed by lower molecular weight TG classes C40-C48 (19-fold) with only a 6-fold increase in C50-C54. In liver, highly unsaturated TG classes (C56-C64) accounted for 49% of total TG at postnatal d 3 and consisted mainly of arachidonic, docosahexaenoic, and linoleic acids accompanied by palmitic and oleic acids. During early postnatal development, TG species containing one, two, or even three 20-22 EFA may be structurally important themselves or serve as direct substrates for synthesis of phospholipids.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Pediatr Res

journal_title

Pediatric research

authors

Chen ZY,Cunnane SC

doi

10.1203/00006450-199201000-00009

subject

Has Abstract

pub_date

1992-01-01 00:00:00

pages

47-51

issue

1

eissn

0031-3998

issn

1530-0447

journal_volume

31

pub_type

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