real-time-sampling-rat-femoral-arteriovenous-adventitial-interstitial

Real-Time Sampling of Rat Femoral Arteriovenous Adventitial Interstitial Fluid by Placement of a Microdialysis Probe

Interstitial fluid (ISF) is a vital element of the extracellular microenvironment, facilitating metabolic exchange and intercellular communication. ...

Chinese Academy of Medical Sciences

Acute myocardial infarction is one of the leading causes of morbidity worldwide, but the underlying mechanism responsible for myocardial ischemia-reperfusion (I/R) injury remains elusive. lncRNA plays roles in inflammatory response, cell apoptosis and regulation of myocardial ischemia. However, whether lncRNA HAGLR could regulate myocardial I/R injury and the molecular mechanism need to be further investigated. lncRNA has been shown to bind to miRNAs and compete with endogenous RNAs. miR-133a-3p has been shown to regulate cardiomyocyte apoptosis and ischemic myocardial injury. In this work, it has shown that knockdown of HAGLR could suppress inflammatory response and cell apoptosis induced by I/R and, thus, alleviate myocardial I/R injury. HAGLR promoted myocardial I/R injury by inhibiting miR-133a-3p to promote MAPK1 expression.

lncRNA HAGLR modulates myocardial ischemia-reperfusion injury in mice through regulating miR-133a-3p/MAPK1 axis.

Converging studies showed interstitial fluid (ISF) adjacent to blood vessels flows in adventitia along vasculature into heart and lungs. We aim to reveal circulatory pathways and regulatory mechanism of such adventitial ISF flow in rat model. By MRI, real-time fluorescent imaging, micro-CT, and histological analysis, ISF was found to flow in adventitial matrix surrounded by fascia and along systemic vessels into heart, then flow into lungs via pulmonary arteries and back to heart via pulmonary veins, which was neither perivascular tissues nor blood or lymphatic vessels. Under physiological conditions, speckle-like adventitial ISF flow rate was positively correlated with heart rate, increased when holding breath, became pulsative during heavy breathing. During cardiac or respiratory cycle, each dilation or contraction of heart or lungs can generate to-and-fro adventitial ISF flow along femoral veins. Discovered regulatory mechanisms of adventitial ISF flow along vasculature by heart and lungs will revolutionize understanding of cardiovascular system.

Article	Year
lncRNA HAGLR modulates myocardial ischemia-reperfusion injury in mice through regulating miR-133a-3p/MAPK1 axis. Open medicine (Warsaw, Poland)\| PubMed ID: 35937000	2022
Regulation of interstitial fluid flow in adventitia along vasculature by heartbeat and respiration. iScience\| PubMed ID: 38532885	2024

WenQi Luo

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