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Updated: Jan 9, 2026

In Vitro Model of Physiological and Pathological Blood Flow with Application to Investigations of Vascular Cell Remodeling

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Increases in Plasma Viscosity Disrupt Microvascular Flow Dynamics.

Cristian E Franco, Albert L Gonzales

Biorxiv : the Preprint Server for Biology

|December 3, 2025

Summary

This summary is machine-generated.

Plasma viscosity significantly impacts capillary blood flow regulation by influencing endothelial cell signaling. This suggests viscosity is a key factor in microvascular perfusion and a potential target for treating microvascular diseases.

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Micro-particle Image Velocimetry for Velocity Profile Measurements of Micro Blood Flows

Published on: April 25, 2013

Area of Science:

Cardiovascular Physiology
Microcirculation Research
Endothelial Cell Biology

Background:

Autoregulation of blood flow involves pressure-induced constriction and flow-mediated dilation, primarily studied in arterioles.
Capillary-level autoregulation, crucial for nutrient exchange, is less understood, particularly the roles of endothelial cells, pericytes, and plasma viscosity.
Plasma viscosity's influence on shear stress and microvascular regulation requires further definition.

Purpose of the Study:

To investigate the impact of plasma viscosity and shear stress on capillary blood flow regulation using an ex vivo retinal preparation.
To analyze the effects of chronic viscosity elevation on microvascular structure, endothelial function, and capillary perfusion in a high-fat diet model.

Main Methods:

Utilized an ex vivo pressurized retinal preparation to maintain the arteriole-capillary continuum.
Examined endothelial and mural cell activity in response to altered intraluminal viscosity and shear stress.
Assessed microvascular remodeling, endothelial responsiveness, and capillary perfusion in a high-fat diet model.

Main Results:

Increased viscosity enhanced endothelial cell calcium activity and suppressed pericyte/smooth muscle cell calcium signaling via nitric oxide.
Chronic viscosity elevation led to arteriolar remodeling but impaired shear sensing and capillary recruitment in transitional and capillary segments.
High-fat diet reduced baseline capillary perfusion and abolished viscosity-dependent modulation, indicating a loss of shear-based control.

Conclusions:

Autoregulation mechanisms differ significantly between arterioles and capillaries, with viscosity-dependent endothelial signaling critical for capillary flow.
Plasma viscosity is a vital regulator of microvascular perfusion.
Plasma viscosity may serve as a biomarker and therapeutic target for microvascular diseases.