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Effect of thyme oil and thymol dietary supplementation on the antioxidant status and fatty acid composition of the ageing rat brain

Published online by Cambridge University Press:  09 March 2007

Kuresh A. Youdim
Aromatic and Medicinal Plant Group, Scottish Agricultural College, Auchincruive, Ayr, KA6 5HW, UK
Stanley G. Deans*
Aromatic and Medicinal Plant Group, Scottish Agricultural College, Auchincruive, Ayr, KA6 5HW, UK
*Corresponding author: Dr Stanley Deans, fax +44 (0)1292 525071, email
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The present study measured changes in antioxidant enzyme activity in, and the phospholipid fatty acid composition of the ageing rat brain and tested whether dietary supplementation with thyme oil or thymol could provide beneficial effects. There were significant declines in superoxide dismutase (EC and glutathione peroxidase (EC activities and the total antioxidant status in the untreated rats with age, while thyme-oil- and thymol-fed rats maintained significantly higher antioxidant enzyme activities and total antioxidant status. The proportions of 18: 2n−6, 20: 1n−9, 22: 4n−6 and 22: 5n−3 in the brain phospholipids resulting from all three dietary treatments were significantly higher in 28-month-old rats than in 7-month-old rats. Only 20: 1n−9 levels in 28-month-old thyme-oil- and thymol-treated rats were significantly higher than in the age-matched control. The proportion of 22: 6n−3 in brain phospholipids, which declined with age in control rats, was also significantly higher in rats given either supplement. This latter finding is particularly important as optimum levels of 22: 6n−3 are required for normal brain function. These results highlight the potential benefit of thyme oil as a dietary antioxidant.

Research Article
Copyright © The Nutrition Society 2000


Ansari, KA, Kaplan, E & Shoeman, D (1989) Age-related changes in lipid peroxidation and protective enzymes in the central nervous system. Growth Development and Aging 53, 117121.Google ScholarPubMed
Barja de Quiroga, G, López-Torres, M & Pérez-Campo, R (1992) Relationship between antioxidants, lipid peroxidation and aging. In Free Radicals and Aging, pp. 109124 [Emerit, I and Chance, B, editors] Basel: Birkhauser Verlag.CrossRefGoogle ScholarPubMed
Barja de Quiroga, G, Pérez-Campo, R & López-Torres, M (1990) Antioxidant defences and peroxidation in liver and brain of aged rats. Biochemical Journal 272, 247250.CrossRefGoogle ScholarPubMed
Benzi, G, Pastoris, O & Villa, RF (1988) Changes induced by ageing and drug treatment on cerebral enzymatic antioxidant systems. Neurochemistry Research 13, 467478.CrossRefGoogle Scholar
Bourre, JM, Bonneil, M, Clément, M, Dumont, O, Durand, G, Lafont, H, Nalbone, G & Piciotti, M (1993) Function of dietary polyunsaturated fatty acids in the nervous system. Prostaglandins Leukotrienes and Essential Fatty Acids 48, 515.CrossRefGoogle ScholarPubMed
Cao, G, Giovanoni, M & Prior, RL (1996) Antioxidant capacity in different tissues of young and old rats. Proceedings of the Society for Experimental Biology and Medicine 211, 359365.CrossRefGoogle ScholarPubMed
Chalon, S, Delion-Vancassel, S, Belzung, C, Guilloteau, D, Leguisquet, AM, Besnard, JC & Durand, G (1998) Dietary fish oil affects monoaminergic neurotransmission and behavior in rats. Journal of Nutrition 128, 25122519.CrossRefGoogle ScholarPubMed
Christie, WW (1982) Lipid Analysis, 2nd ed. Oxford: Pergamon Press.Google Scholar
Clark, GS (1995) An aroma chemical profile: thymol. Perfumer and Flavorist 20, 4144.Google Scholar
Cohen, BM & Zubenko, GS (1985) Aging and the biophysical properties of cell membranes. Life Sciences 37, 14031409.CrossRefGoogle ScholarPubMed
Dahn, HC, Benedetti, MS & Dostert, P (1983) Differential changes in superoxide dismutase activity in brain and liver of old rats and mice. Journal of Neurochemistry 40, 10031007.Google Scholar
Deans, SG, Noble, RC, Macpherson, A, Penzes, L & Imre, SG (1994) A new type of approach to modify lipid patterns in ageing mice. Natural antioxidants of plant origin. In Aspects of Ageing and Disease, pp. 173177 [Knook, DL, and Hofecker, G, editors]. Vienna: Facultas Universitatsverlag.Google Scholar
Deans, SG, Noble, RC, Penzes, L & Bergi, E (1993a) Natural antioxidants from aromatic and medicinal plants. In Role of Free Radicals in Biological Systems, pp. 159165 [Fehér, J, Blázovics, A, Matkovics, B and Mézes, M, editors]. Budapest: Akademiai Kiado.Google Scholar
Deans, SG, Noble, RC, Penzes, L & Imre, SG (1993 b) Promotional effects of plant volatile oils on the polyunsaturated fatty acid status during ageing. Age 16, 7174.CrossRefGoogle Scholar
Deans, SG & Svoboda, KP (1990) Biotechnology and bioactivity of culinary and medicinal plants. Commonwealth Agricultural Bureau, International AgBiotechnology News & Information 2, 211216.Google Scholar
Gurr, MI, Robinson, MP & James, AT (1969) The mechanism for the formation of polyunsaturated fatty acids by photosynthetic tissue. European Journal of Biochemistry 9, 7078.CrossRefGoogle ScholarPubMed
Halliwell, B & Gutteridge, JMC (1989) Free Radicals in Biology and Medicine, 2nd ed. Oxford: Clarendon Press.Google Scholar
Harman, D (1995) Role of antioxidant nutrients in ageing, overview. Age 18, 5162.CrossRefGoogle Scholar
Kaplan, RJ & Greenwood, CE (1998) Dietary saturated fatty acids and brain function. Neurochemistry Research 23, 615626.CrossRefGoogle ScholarPubMed
Kurobe, N, Suzuki, F, Kato, K & Sato, T (1990) Sensitive immunoassay of Cu/Zn superoxide dismutase: concentrations in the brain, liver and kidney are not affected by ageing. Biomedical Research 11, 187194.CrossRefGoogle Scholar
Lamptey, MS & Walker, BL (1976) A possible dietary role for linolenic acid in the development of the young rat. Journal of Nutrition 106, 8693.CrossRefGoogle ScholarPubMed
Mizuno, Y & Ohta, K (1986) Regional distribution of TBA products, activities of enzymes regulating the metabolism of oxygen free radicals and some of the related enzymes in adult and aged rat brains. Journal of Neurochemistry 46, 13441352.CrossRefGoogle Scholar
Neuringer, M, Anderson, GJ & Connor, WE (1988) The essentiality of n−3 fatty acids for the development and function on the retina and brain. Annual Review in Nutrition 8, 517541.CrossRefGoogle ScholarPubMed
Neuringer, M & Connor, WE (1986) N-3 fatty acids in the brain and retina: evidence for their essentiality. Nutrition Reviews 44, 285294.CrossRefGoogle ScholarPubMed
Okuyama, H (1992) Minimum requirements of n−3 and n−6 essential fatty acids for the function of the central nervous system and for the prevention of chronic disease. Proceedings of the Society for Experimental Biology and Medicine 200, 174176.CrossRefGoogle ScholarPubMed
Onuma, Y, Masuzawa, Y, Ishima, Y & Waku, K (1984) Selective incorporation of docosahexaenoic acid in rat brain. Biochimica et Biophysica Acta 793, 8085.Google ScholarPubMed
Rao, G, Xia, E & Richardson, A (1990) Effect of age on the expression of antioxidant enzymes in male Fischer F344 rats. Mechanisms of Ageing and Development 53, 4960.CrossRefGoogle ScholarPubMed
Recsan, Z, Pagliuca, G, Piretti, MV, Penzes, LG, Youdim, KA, Noble, RC & Deans, SG (1997) Effect of essential oils on the lipids of the retina in the ageing rat. a possible therapeutic use. Journal of Essential Oil Research 9, 5356.CrossRefGoogle Scholar
Reiss, U & Gershon, D (1976) Comparisons of cytoplasmic superoxide dismutase in liver, heart, and brain of ageing rats and mice. Biochemical and Biophysical Research Communications 73, 255262.CrossRefGoogle ScholarPubMed
Salem, N Jr (1989) Omega-3 fatty acids, molecular and biochemical aspects. In New Protective Roles for Selected Nutrients, pp. 109228 [Spiller, G and Scala, J, editors). New York, NY: Alan R. Liss, Inc.Google Scholar
Scott, BL & Bazan, NG (1989) Membrane docosahexaenoate is supplied to the developing brain and retina by the liver. Proceedings of the National Academy of Sciences USA 86, 29032907.CrossRefGoogle Scholar
Semsei, I, Rao, G & Richardson, A (1991) Expression of superoxide dismutase and catalase in rat brain as a function of age. Mechanisms of Ageing and Development 58, 1319.CrossRefGoogle ScholarPubMed
Socci, DJ, Crandall, BM & Arendash, GW (1995) Chronic antioxidant treatment improves the cognitive performance in aged rats. Brain Research 693, 8894.CrossRefGoogle ScholarPubMed
Spector, AA & Yoerk, MA (1985) Membrane lipid composition and cellular function. Journal of Lipid Research 26, 10151035.CrossRefGoogle ScholarPubMed
Stubbs, CD & Smith, AD (1984) The modification of mammalian membrane polyunsaturated fatty acid composition in relation to membrane fluidity and function. Biochimica et Biophysica Acta 779, 89137.CrossRefGoogle ScholarPubMed
Suzuki, H, Park, SJ, Tamura, M & Ando, S (1998) Effect of the long-term feeding of dietary lipids on the learning ability, fatty acid composition of brain stem phospholipids and synaptic membrane fluidity in adult mice: a comparison of sardine oil diet with palm oil diet. Mechanisms of Ageing and Development 16, 119128.CrossRefGoogle Scholar
Vanella, A, Villa, RF, Gorini, A, Campisi, A & Giuffridaa-Stella, AM (1989) Superoxide dismutase and cytochrome oxidase activities in light and heavy synaptic mitochondria from rat cerebral cortex during aging. Journal of Neuroscience Research 22, 351355.CrossRefGoogle ScholarPubMed
Vitorica, J, Machado, A & Satrustegni, J (1984) Age-dependent variations in peroxide utilising enzymes from rat brain mitochondria and cytoplasm. Journal of Neurochemistry 42, 351356.CrossRefGoogle ScholarPubMed
Wahnon, R, Mokady, S & Cogan, U (1989) Age and membrane fluidity. Mechanisms of Ageing and Development 50, 249255.CrossRefGoogle ScholarPubMed
Yamamoto, N, Okaniwa, Y, Mori, S, Nomura, M & Okuyama, H (1991) Effects of high-linoleate and a high alpha-linolenate diet on the learning ability of aged rats. Evidence against an autoxidation-related lipid peroxide theory of aging. Journal of Gerontology 46, 1722.CrossRefGoogle Scholar
Yamamoto, N, Saitoh, M, Moriuchi, A, Nomura, M & Okuyuma, H (1987) Effects of dietary alpha-linolenate/linoleate balance on brain lipid composition and learning ability of rats. Journal of Lipid Research 28, 144151.CrossRefGoogle ScholarPubMed
Youdim, K (1997) Potential beneficial effects of thyme oil and thymol on aspects of ageing processes. PhD Thesis, University of Strathclyde.Google Scholar