A low alpha-linolenic intake during early life increases adiposity in the adult guinea pig

Abstract

Background: The composition of dietary fatty acids (FA) during early life may impact adult adipose tissue (AT) development. We investigated the effects of alpha-linolenic acid (ALA) intake during the suckling/weaning period on AT development and metabolic markers in the guinea pig (GP).

Methods: Newborn GP were fed a 27%-fat diet (w/w %) with high (10%-ALA group), moderate (2.4%-ALA group) or low (0.8%-ALA group) ALA content (w/w % as total FA) until they were 21 days old (d21). Then all animals were switched to a 15%-fat diet containing 2% ALA (as total FA) until 136 days of age (d136).

Results: ALA and docosapentaenoic acid measured in plasma triglycerides (TG) at d21 decreased with decreasing ALA intake. Total body fat mass was not different between groups at d21. Adipose tissue TG synthesis rates and proliferation rate of total adipose cells, as assessed by 2H2O labelling, were unchanged between groups at d21, while hepatic de novo lipogenesis was significantly 2-fold increased in the 0.8%-ALA group. In older GP, the 0.8%-ALA group showed a significant 15-%-increased total fat mass (d79 and d107, p < 0.01) and epididymal AT weight (d136) and tended to show higher insulinemia compared to the 10%-ALA group. In addition, proliferation rate of cells in the subcutaneous AT was higher in the 0.8%-ALA (15.2 +/- 1.3% new cells/5d) than in the 10%-ALA group (8.6 +/- 1.7% new cells/5d, p = 0.021) at d136. AT eicosanoid profiles were not associated with the increase of AT cell proliferation.

Conclusion: A low ALA intake during early postnatal life promotes an increased adiposity in the adult GP.

Figure 1

Fatty acid composition (mol %) of plasma triglycerides (TG) and phospholipids (PL) at d21. Proportion of ALA and total other long-chain n-3 PUFAs (C20:3n-3, C20:5n-3, C22:5n-3, C22:6n-3) in plasma TG (A) and PL (B). Proportion of LA and total other long-chain n-6 PUFAs (C20:2n-6, C20:3n-6, C20:4n-6, C22:2n-6, C22:4n-6) in plasma TG (C) and PL (D). Data are medians ± SEmedian, n = 4-5 samples/group in duplicate. LA, linoleic acid; ALA, alpha-linolenic acid. * p < 0.05, ** p < 0.01, *** p < 0.001 between groups.

Figure 2

Fat mass evolution. (A) Fat mass (g) evolution from d21 to 128. (B) Fat mass (% of body weight) at 21, 79, 107 and 128 days. Data are means ± SE, n = 15-20 guinea pigs/group. ⁺ indicates p < 0.05 between the 0.8%-ALA and 2.4%-ALA or 10%-ALA groups. * indicates p < 0.05 and ** indicates p < 0.01 between the 0.8%-ALA and 10%-ALA groups.

Figure 3

Plasma insulin concentrations and pancreatic insulin contents. (A) Plasma insulin at d21, n = 5 guinea pigs/group. (B) Plasma and pancreas insulin at d136, n = 10-15 guinea pigs/group. Data are medians ± SEmedian, no significant difference.