Abstract

Phospholipid Pool, Lipid Peroxidation, and Superoxide Dismutase Activity under Various Types of Oxidative Stress of the Brain and the Effect of Low-Energy Infrared Laser Irradiation

K. G. Karageuzyan^1*, E. S. Sekoyan², A. T. Karagyan², N. R. Pogosyan², G. G. Manucharyan², A. E. Sekoyan¹, A. Yu. Tunyan², V. G. Boyajyan², and M. K. Karageuzyan¹

¹Institute of Molecular Biology, National Academy of Sciences of Armenia, ul. Asratyana 7, Erevan, 375014 Armenia; E-mail: gkarine@pnas.sci.am

²Institute of Balneology and Physical Medicine, Ministry of Health Care of Armenia, ul. Br. Orbeli 41, Erevan, 375028 Armenia

^* To whom correspondence should be addressed.

Received November 27, 1997; Revision received March 11, 1998
The effect of low-energy infrared laser irradiation on the phospholipid pool, lipid peroxidation, and superoxide dismutase activity in the brain of white rats was studied in experimental ischemia, reperfusion, and acute edema. These models are characterized by oxidative stress; the contents of tri- and diphosphoinositides and sphingomyelins were lowered, whereas the levels of phosphatidylserine and phosphatidylethanolamine did not change, and the amount of phosphatidylcholine was increased. In acute brain edema, the contents of hydroperoxides and malonic dialdehyde in enzymatic and nonenzymic lipid peroxidation systems were increased in mitochondrial and microsomal fractions and the level of arachidonic acid was significantly elevated. Infrared laser irradiation contributes to the correction of the changes in the phospholipid pool; laser irradiation lowered the increased levels of hydroperoxides and malonic dialdehyde and elevated superoxide dismutase activity in the brain during ischemia, reperfusion, and acute edema of the brain. The data suggest that low-energy infrared laser irradiation has certain neuroprotective activity in various types of oxidative stress including ischemia, reperfusion, and acute edema of the brain.
KEY WORDS: brain, phospholipids, oxidative stress, ischemia, reperfusion, edema, laser irradiation

Phospholipid Pool, Lipid Peroxidation, and Superoxide Dismutase Activity under Various Types of Oxidative Stress of the Brain and the Effect of Low-Energy Infrared Laser Irradiation

K. G. Karageuzyan1*, E. S. Sekoyan2, A. T. Karagyan2, N. R. Pogosyan2, G. G. Manucharyan2, A. E. Sekoyan1, A. Yu. Tunyan2, V. G. Boyajyan2, and M. K. Karageuzyan1

K. G. Karageuzyan^1*, E. S. Sekoyan², A. T. Karagyan², N. R. Pogosyan², G. G. Manucharyan², A. E. Sekoyan¹, A. Yu. Tunyan², V. G. Boyajyan², and M. K. Karageuzyan¹