Cerebral tissue oxygenation impairment during experimental cerebral malaria

Abstract

Ischemia and hypoxia have been implicated in cerebral malaria (CM) pathogenesis, although direct measurements of hypoxia have not been conducted. C57BL/6 mice infected with Plasmodium berghei ANKA (PbA) develop a neurological syndrome known as experimental cerebral malaria (EC M), whereas BALB/c mice are resistant to EC M. In this study, intravital microscopy methods were used to quantify hemodynamic changes, vascular/tissue oxygen (O2) tension (PO2), and perivascular pH in vivo in EC M and non-EC M models, employing a closed cranial window model. EC M mice on day 6 of infection showed marked decreases in pial blood flow, vascular (arteriolar, venular), and perivascular PO2, perivascular pH, and systemic hemoglobin levels. Changes were more dramatic in mice with late-stage EC M compared with mice with early-stage EC M. These changes led to drastic decreases in O2 delivery to the brain tissue. In addition, EC M animals required a greater PO2 gradient to extract the same amount of O2 compared with non-infected animals, as the pial tissues extract O2 from the steepest portion of the blood O2 equilibrium curve. EC M animals also showed increased leukocyte adherence in postcapillary venules, and the intensity of adhesion was inversely correlated with blood flow and O2 extraction. PbA-infected BALB/c mice displayed no neurological signs on day 6 and while they did show changes similar to those observed in C57BL/6 mice (decreased pial blood flow, vascular/tissue PO2, perivascular pH, hemoglobin levels), non-EC M animals preserved superior perfusion and oxygenation compared with EC M animals at similar anemia and parasitemia levels, resulting in better O2 delivery and O2 extraction by the brain tissue. In conclusion, direct quantitative assessment of pial hemodynamics and oxygenation in vivo revealed that EC M is associated with severe progressive brain tissue hypoxia and acidosis