Reduced cerebral blood flow and N-acetyl aspartate in a murine model of cerebral malaria

Parasitol Res. 2005 Jul;96(5):302-7. doi: 10.1007/s00436-005-1349-z. Epub 2005 May 26.

Abstract

Cerebral malaria is an important cause of morbidity and mortality in many parts of the world. It has been suggested that cerebral malaria is associated with reduced perfusion due to the blockage of blood vessels by parasitized erythrocytes; although, no quantitative validation of this has been done. We infected C57BL/6 mice with the ANKA strain of Plasmodium berghei and on day 6 of infection we investigated alterations in brain function using arterial spin labeling MRI and proton MRS. MR images did not demonstrate signs of damage. However, there was a significant reduction in cerebral blood flow (P<0.012) and the ratio of N-acetyl-aspartate (NAA) to creatine (Cr) (P<0.01) relative to non-infected mice. The NAA/Cr ratios were significantly correlated with cerebral perfusion (r=0.87) suggesting a relationship between impaired oxygen delivery and neuronal dysfunction. Pathological examination revealed accumulations of damaged axons providing a correlate for the decreased NAA/Cr ratio in infected mice. This murine model will permit non-invasive studies of neurologic function during malarial infection.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Animals
  • Aspartic Acid / analogs & derivatives*
  • Aspartic Acid / metabolism
  • Axons / pathology
  • Brain / blood supply
  • Brain / diagnostic imaging
  • Brain / metabolism
  • Brain / pathology
  • Cerebrovascular Circulation*
  • Disease Models, Animal
  • Down-Regulation
  • Magnetic Resonance Imaging
  • Malaria, Cerebral / metabolism*
  • Malaria, Cerebral / pathology
  • Malaria, Cerebral / physiopathology*
  • Mice
  • Mice, Inbred C57BL
  • Plasmodium berghei*
  • Radiography

Substances

  • Aspartic Acid
  • N-acetylaspartate