Integration of non-linear cellular mechanisms regulating microvascular perfusion.
It is becoming increasingly evident that interactions between the different cell types present in the vessel wall and the physical forces that result from blood flow are highly complex. This short article will review evidence that irregular fluctuations in vascular resistance are generated by non-linearity in the control mechanisms intrinsic to the smooth muscle cell and can be classified as chaotic. Non-linear systems theory has provided insights into the mechanisms involved at the cellular level by allowing the identification of dominant control variables and the construction of one-dimensional iterative maps to model vascular dynamics. Experiments with novel peptide inhibitors of gap junctions have shown that the coordination of aggregate responses depends on direct intercellular communication. The sensitivity of chaotic trajectories to perturbation may nevertheless generate a high degree of variability in the response to pharmacological interventions and altered perfusion conditions.
Griffith
T M
TM
Department of Diagnostic Radiology, University of Wales College of Medicine, Cardiff, UK.
Edwards
D H
DH
D000818:Animals; D001696:Biomechanical Phenomena; D004423:Ear / Q000098:blood supply; D008833:Microcirculation / Q000166:cytology* / Q000187:drug effects / Q000502:physiology; D009131:Muscle, Smooth, Vascular / Q000187:drug effects / Q000502:physiology; D017711:Nonlinear Dynamics; D011817:Rabbits; D014655:Vascular Resistance / Q000187:drug effects / Q000502:physiology; D014666:Vasomotor System / Q000187:drug effects / Q000502:physiology