Rapid and local autoregulation of cerebrovascular blood flow: a deep-brain imaging study in the mouse.
The brain obtains energy by keeping the cerebral blood flow constant against unexpected changes in systemic blood pressure. Although this homeostatic mechanism is widely known as cerebrovascular autoregulation, it is not understood how widely and how robustly it works in the brain. Using a needle-like objective lens designed for deep-tissue imaging, we quantified the degree of autoregulation in the mouse hippocampus with single-capillary resolution. On average, hippocampal blood flow exhibited autoregulation over a comparatively broad range of arterial blood pressure and did not significantly respond to pressure changes induced by the pharmacological activation of autonomic nervous system receptors, whereas peripheral tissues showed linear blood flow changes. At the level of individual capillaries, however, about 40% of hippocampal capillaries did not undergo rapid autoregulation. This heterogeneity suggests the presence of a local baroreflex system to implement cerebral autoregulation.
Kuga
Nahoko
N
Laboratory of Chemical Pharmacology, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan.
Hirata
Tadashi
T
Sakai
Ikuko
I
Tanikawa
Yoshihisa
Y
Chiou
Huei Yu
HY
Kitanishi
Takuma
T
Matsuki
Norio
N
Ikegaya
Yuji
Y
D000818:Animals; D001776:Blood Circulation Time / Q000295:instrumentation / Q000379:methods; D001783:Blood Flow Velocity / Q000502:physiology; D001921:Brain / Q000098:blood supply*; D002560:Cerebrovascular Circulation / Q000502:physiology*; D016650:Fluorescein-5-isothiocyanate / Q000032:analysis; D006706:Homeostasis / Q000502:physiology*; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D018613:Microscopy, Confocal / Q000295:instrumentation / Q000379:methods; D013997:Time Factors
D016650:Fluorescein-5-isothiocyanate