Abstract
Metabolism of 1-14C linolenic acid was studied in growing animals by injecting the tracer intraperitoneally into 12–13 day old suckling rats and following up the results by sacrificing groups of animals at 8 hr, 48 hr, 15 day, and 45 day intervals. In the first 15 days, there was a greater decrease in radioactivity of brain total lipids compared to the later period, although the earlier age period is characterized by lipid deposition rather than breakdown. Since the 18∶3 ω3 family of fatty acids occurs largely in the brain total phosphatidyl ethanolamine fraction, we expected that, in the initial period, total phosphatidyl ethanolamine would be the most highly radioactive component. However, results showed that 8 hr after the tracer phosphatidyl choline had the highest specific radioactivity. When the total phosphatidyl ethanolamine fraction was resolved into diacyl and alk-1-enyl species, it was found that radioactivity was not distributed evenly between the two species. There was a progressive increase in radioactivity of the alkenyl and a decrease in the diacyl species. Forty-eight hr after the tracer, however, the radioactivity of phosphatidyl ethanolamine increased and at 45 days remained slightly higher than phosphatidyl choline. Radioactivity of cholesterol, a result of synthesis from acetate undoubtedly derived from the breakdown of tracer linolenate, was also high 48 hr after tracer and remained high until 45 days.
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References
Alfin-Slater, R.B., and L. Aftergood, Physiol. Rev. 48:758 (1968).
Chippendale, G.M., D.S. Beck, and F.M. Strong, J. Insect. Physiol. 11:211 (1965).
Lee, D.J., J.N. Roehm, T.C. Yu, and R.O. Sinnhuber, J. Nutr. 92:93 (1967).
Castell, J.D., R.O. Sinnhuber, J.H. Wales, and D.J. Lee, Ibid. 102:77 (1972).
Tinoco, J., M.A. Williams, I. Hincenbergs, and R.L. Lyman, Ibid. 101:937 (1971).
Crawford, M.A., and A.J. Sinclair, Ibid. 102:1315 (1972).
Takayasu, K., K. Okuda, and I. Yoshikawa, Lipids 5:743 (1970).
Klenk, E., and D. Erberhagen, Hoppe-Seyler's Z. Physiol. Chem. 322:258 (1960).
Oshima, M., and M.P. Carpenter, Biochim. Biophys. Acta. 152:479 (1968).
Peluffo, R.O., S. Ayala, and R.R. Brenner, Amer. J. Physiol. 218:669 (1970).
Kirschman, J.C., and J.G. Coniglio, Arch. Biochem. Biophys. 93:297 (1961).
Bernsohn, J., and L.M. Stephanides, Nature 215:821 (1967).
Sinclair, A.J., and M.A. Crawford, J. Neurochem. 19:1753 (1972).
D'Adamo, A.F., Jr., in “Handbook of Neurochemistry”, Vol. 3, Edited by A. Lajtha, Plenum Press, New York, N.Y., 1970, pp. 525–546.
Dhopeshwarkar, G.A., and J.F. Mead, “Advances in Lipid Research”, Vol. 11, Edited by R. Paoletti and D. Kritchevsky, Academic Press, New York, N.Y., 1973, pp. 109–142.
Miyamoto, K., L.M. Stephanides, and J. Bernsohn, J. Neurochem. 14:227 (1967).
Dhopeshwarkar, G.A., C. Subramanian, and J.F. Mead, Biochim. Biophys. Acta 239:162 (1971).
Dhopeshwarkar, G.A., and C. Subramanian, Lipids 10:238 (1975).
Folch, J., M. Lees, and G.H. Sloane Stanley, J. Biol. Chem. 226:497 (1957).
Dhopeshwarkar, G.A., and J.F. Mead, Biochim. Biophys. Acta 187:461 (1969).
Rouser, G., G. Krichevsky, D. Heller, and E. Lieber, JAOCS 40:425 (1963).
Dhopeshwarkar, G.A., C. Subramanian, and J.F. Mead, Lipids 8:753 (1973).
Hoshi, M., M. Williams, and Y. Kishimoto, J. Neurochem. 21:709 (1973).
Schmid, H.H.O., and H.K. Mangold, Biochim. Biophys. Acta 125:182 (1966).
Fewster, M.D., H. Hirono, and J.F. Mead, J. Neurochem. 19:1803 (1972).
Wells, M.A., and J.C. Dittmer, Biochemistry 6:3169 (1967).
Spohn, M., and A.N. Davison, J. Lipid Res. 13:563 (1972).
Dhopeshwarkar, G.A., C. Subramanian, and J.F. Mead, Biochim. Biophys. Acta 296:257 (1973).
Kishimoto, Y., and N.S. Radin, Lipids 1:47 (1966).
Sun, G.Y., and L.A. Horrock, Ibid., 3:79 (1968).
Galli, C., H.B. White, Jr., and R. Paoletti, J. Neurochem. 17:347 (1970).
Kishimoto, Y., W.E. Davies, and N.S. Radin, J. Lipid Res. 6:532 (1965).
Dobbing, J. Physiol. Rev. 41:130 (1961).
Smith, M.E., in “Advances in Lipid Research”, Vol. 5, Edited by R. Paoletti and D. Kritchevsky, Academic Press, New York, N.Y., 1967, pp. 241–274.
Burton, R.M., in “Handbook of Neurochemistry”, Vol. VA, Edited by A. Lajtha, Plenum Press, New York, N.Y., 1971, pp. 199–214.
Sun, G.Y., and L.A. Horrocks, J. Neurochem. 16:181 (1969).
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An erratum to this article is available at http://dx.doi.org/10.1007/BF02532734.
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Dhopeshwarkar, G.A., Subramanian, C. Metabolism of 1-14C linolenic acid in developing brain: II. Incorporation of radioactivity from 1-14C linolenate into brain lipids. Lipids 10, 242–247 (1975). https://doi.org/10.1007/BF02532487
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DOI: https://doi.org/10.1007/BF02532487