Direct effects of temperature on phospholipid and polyunsaturated fatty acid metabolism in isolated brain cells from rainbow trout, Oncorhynchus mykiss

Citation

Tocher DR & Sargent JR (1992) Direct effects of temperature on phospholipid and polyunsaturated fatty acid metabolism in isolated brain cells from rainbow trout, Oncorhynchus mykiss. Comparative Biochemistry and Physiology - B: Comparative Biochemistry, 101 (3), pp. 353-359. https://doi.org/10.1016/0305-0491%2892%2990012-G

Abstract
1. The direct effects of temperature on the metabolism of [1-14C18]:2(n-6), [1-14C]18:3(n-3), [1-14C]20:4(n-6) and [1-14C]20:5(n-3) were studied in isolated brain cells from rainbow trout, Oncorhynchus mykiss 2. Recovery of radioactivity from all the polyunsaturated fatty acids (PUFA) in total lipid was significantly greater at 5 and 15°C than at 25°C. 3.The lower incubation temperatures decreased the relative net incorporation of all the 14C-labelled PUFA into phosphatidylcholine (PC) and increased the relative incorporation of the PUFA into the other phosphoglycerides, especially phosphatidylethanolamine (PE). 4. The effects on PC were generally more significant between 25 and 15°C, whereas the effects on PE were generally significant both between 25 and 15°C and between 15 and 5°C. 5. This suggests that the lysophospholipid acyltransferases responsible for the incorporation of PUFA into different phosphoglycerides may have differential sentivities to temperature. 6. In contrast, the acyltransferase activities showed fatty acyl preferences that were independent of temperature. 7. Although a trend towards decreased activity at 5°C was apparent, temperature generally had little significant effect on the relative percentages of the PUFA metabolized via the desaturase pathways

Journal
Comparative Biochemistry and Physiology - B: Comparative Biochemistry: Volume 101, Issue 3