title: Determination of relaxation characteristics during preacute stage of lysophosphatidyl choline-induced demyelinating lesion in rat brain: an animal model of multiple sclerosis.
abstract: Relaxation time measurements were carried out during the preacute stage of lesion progression in an animal model of demyelination created in the internal capsule (ic) area of the rat brain using lysophosphatidyl choline (LPC). T1 and T2 were determined both before and after 36 h of lesion creation. Histology carried out on the rats after MR measurements showed focal demyelinating lesion and surrounding edema with prominent infiltration of inflammatory cells. Both T1 and T2 were statistically higher for the lesion compared to that determined before lesion creation. Percentage increase in T2 was found to be higher by approximately 45% compared to before lesion creation while T1 showed about 25% increase. Increase in T1 and T2 may be attributed to the early acute inflammatory response due to LPC. The beginning of the inflammatory response following LPC injection may also be a contributing factor. The study demonstrates that the quantitative estimate of MR relaxation provides useful information on the pathological events occurring during the early phase of the progression of demyelination.
authors.affiliation: Department of NMR, All India Institute of Medical Sciences, New Delhi-110 029, India.
authors.forename: Mahaveer N
authors.initials: MN
authors.lastname: Degaonkar
authors.forename: Partha
authors.initials: P
authors.lastname: Raghunathan
authors.forename: Rama
authors.initials: R
authors.lastname: Jayasundar
authors.forename: Naranamangalam R
authors.initials: NR
authors.lastname: Jagannathan
mesh_terms: D000818:Animals; D001927:Brain Diseases / Q000473:pathology*; D003711:Demyelinating Diseases / Q000139:chemically induced / Q000473:pathology*; D004195:Disease Models, Animal; D018450:Disease Progression; D008244:Lysophosphatidylcholines; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D009103:Multiple Sclerosis / Q000473:pathology; D051381:Rats; D017208:Rats, Wistar
chemical_list: D008244:Lysophosphatidylcholines