Abstract
The American marten (Martes americana) is a boreal forest marten with low body adiposity but high metabolic rate. The study describes the FA composition in white adipose tissue depots of the species and the influence of food deprivation on them. American marten (n=8) were fasted for 2 d with 7 control animals. Fasting resulted in a 13.4% weight loss, while the relative fat mass was >25% lower in the fasted animals. The FA composition of the fat depots of the trunk was quite similar to other previously studied mustelids with 14∶0, 16∶0, 18∶0, 16∶1n−7, 18∶1n−9, and 18∶2n−6 as the most abundant FA. In the extremities, there were higher proportions of monounsaturated FA (MUFA) and PUFA. Food deprivation decreased the proportions of 16∶0 and 16∶1n−7, while the proportion of long-chain MUFA increased in the trunk. The mobilization of FA was selective, as 16∶1n−7, 18∶1n−9, and particular n−3 PUFA were preferentially mobilized. Relative mobilization correlated negatively with the carbon chain length in saturated FA (SFA) and n−9 MUFA. The Δ9 desaturation of SFA enhanced the mobilization of the corresponding MUFA, but the positional isomerism of the first double bond did not correlate consistently with relative mobilization in MUFA or PUFA. In the marten, the FA composition of the extremities was highly resistant to fasting, and the tail tip and the paws contained more long-chain PUFA to prevent the solidification of lipids and to maintain cell membrane fluidity during cooling.
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Abbreviations
- BM:
-
body mass
- BMI:
-
body mass index
- DBI:
-
double bond index
- DI:
-
desaturation index
- dia:
-
diaphragmatic
- jab:
-
intra-abdominal
- mes:
-
mesenteric
- MUFA:
-
monounsaturated FA
- om:
-
omental
- rp:
-
retroperitoneal
- sc:
-
subcutaneous
- SFA:
-
saturated FA
- TACL:
-
total average chain length
- UFA:
-
unsaturated FA
- VLCFA:
-
very long chain FA
- WAT:
-
white adipose tissue
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Nieminen, P., Rouvinen-Watt, K., Collins, D. et al. Fatty acid profiles and relative mobilization during fasting in adipose tissue depots of the American marten (Martes americana). Lipids 41, 231–240 (2006). https://doi.org/10.1007/s11745-006-5092-8
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DOI: https://doi.org/10.1007/s11745-006-5092-8