Theoretical and Experimental Investigations of Microcirculatory Signaling (SCI) Grant

abstract

  • Blood pressure sensitivity to salt intake appears in both hypertensives and normotensives and represents a major health problem as it is associated with increased cardiovascular risk. Prior investigations have suggested a central role for the L-arginine-nitric oxide (NO) system in salt sensitivity. Despite significant prior contributions, fundamental questions about the role of NO in the regulation of vascular tone remain unanswered and this impedes current efforts to optimize available interventions and/or develop new therapeutic strategies. Therefore, this research proposal aims to fill an important gap in the understanding of the mechanisms that regulate vascular resistance and to translate this knowledge into clinically testable hypotheses for improved therapeutic practice in hypertension. The central hypothesis of this study is that regulation of vascular resistance emerges from the nonlinear interaction of Ca2+ and NO-dependent signaling pathways. Altered NO/Ca2+ dynamics contribute to a different phenotype in the microcirculation of salt-sensitive hypertensives. In this study we follow an innovative synergistic approach of theoretical modeling and in vitro experimentation to elucidate signaling mechanisms in the microcirculation. Mathematical models integrate biophysically detailed mechanisms at the cellular level to describe physiological function at a macroscale tissue level. The overall goal is to provide a theoretical framework that will guide the development of novel therapeutic strategies in salt sensitivity. In vitro experimental studies assist in model development and test model generated hypotheses. Microcirculatory phenotype and vascular reactivity are assessed in an animal model of salt sensitive hypertension. Synergistic strategies of NO stimulation combined with inhibition of the angiotensin system or effectors of Ca2+ homeostasis are evaluated for their ability to restore normal vascular function. Relevance: Salt intake affects blood pressure levels in a large percentage of the population. This condition, referred to as salt sensitivity, represents a major public health problem as it is associated with an increased risk for cardiovascular disease. In this study we utilize a novel approach of combining computational modeling and experimentation to investigate the mechanisms that link salt intake and blood pressure. Preliminary results suggest that combination of available pharmaceutics can have beneficial effects in restoring function in the microcirculation and will be tested in hypertensive animals.

date/time interval

  • July 1, 2008 - June 30, 2014

sponsor award ID

  • 1SC1HL095101-01

local award ID

  • AWD000000000259

contributor

keywords

  • Affect
  • Angiotensins
  • Animal Model
  • Animals
  • Area
  • Arginine
  • Atherosclerosis
  • Biological
  • Biological Models
  • Blood Pressure
  • Blood Vessels
  • Cause of Death
  • Chronic
  • Clinical
  • Complex
  • Computer Simulation
  • Condition
  • Data
  • Development
  • Disease
  • Equilibrium
  • Event
  • Feedback
  • Functional disorder
  • Goals
  • Health
  • Heart Diseases
  • Homeostasis
  • Hypertension
  • In Vitro
  • Intervention
  • Investigation
  • Kidney
  • Kidney Failure
  • Knowledge
  • Laboratories
  • Lead
  • Life
  • Link
  • Microcirculation
  • Modeling
  • Molecular Profiling
  • Nitric Oxide
  • Ouabain
  • Outcome
  • Oxidative Stress
  • Peripheral
  • Personal Satisfaction
  • Pharmacy (field)
  • Phenotype
  • Physiological
  • Physiology
  • Play
  • Population
  • Positioning Attribute
  • Predisposition
  • Public Health
  • Publications
  • Pump
  • Rattus
  • Regulation
  • Relaxation
  • Renal function
  • Renin-Angiotensin System
  • Research
  • Research Proposals
  • Resistance
  • Role
  • Second Messenger Systems
  • Series
  • Signal Pathway
  • Signal Transduction
  • Signal Transduction Pathway
  • Sodium Chloride
  • Sodium-Calcium Exchanger
  • Solid
  • Stroke
  • System
  • Testing
  • Theoretical Studies
  • Theoretical model
  • Therapeutic
  • Tissues
  • Translating
  • Vascular resistance
  • Work
  • base
  • cardiovascular disorder risk
  • cardiovascular risk factor
  • experience
  • functional restoration
  • improved
  • in vitro Model
  • inhibitor/antagonist
  • innovation
  • insight
  • interest
  • mathematical model
  • model development
  • mouse Smc1l1 protein
  • mouse Smc1l2 protein
  • normotensive
  • novel strategies
  • novel therapeutics
  • protein expression
  • research study
  • response
  • salt intake
  • salt sensitive
  • second messenger
  • skills