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Related Experiment Videos

Functional and structural changes in veins in spontaneous hypertension

S Greenberg, W Wilborn

    Archives Internationales De Pharmacodynamie Et De Therapie
    |August 1, 1982
    PubMed
    Summary

    Spontaneously hypertensive rats exhibit altered portal vein, vena cavae, and pulmonary arteries. These blood vessels show structural and functional changes, including increased protein, independent of pressure.

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    Area of Science:

    • Cardiovascular Physiology
    • Vascular Biology
    • Hypertension Research

    Background:

    • Spontaneously hypertensive rats (SHR) are a common model for studying hypertension.
    • Understanding vascular adaptations in SHR is crucial for hypertension research.

    Purpose of the Study:

    • To investigate functional and structural changes in the portal vein (PV), inferior vena cavae (IVC), and pulmonary arteries (PA) of SHR.
    • To determine if these vascular changes are pressure-dependent.

    Main Methods:

    • Comparative analysis of PV, IVC, and PA from SHR and normotensive Wistar-Kyoto rats (WKY).
    • Assessment of vascular extensibility, tension development, and sensitivity to vasoactive agents.
    • Measurement of protein and DNA synthesis and content.
    • Histological and electron microscopy examination of vascular tissues.

    Main Results:

    • SHR exhibited less extensible and higher-tension developing PV, IVC, and PA compared to WKY.
    • Vessels from SHR showed enhanced sensitivity to serotonin and thromboxane-like prostanoids.
    • Increased accumulation of protein precursors and elevated protein content with decreased DNA concentration were observed in SHR vessels.
    • Medial smooth muscle hypertrophy, increased PAS-Schiff staining, and enlarged Golgi apparati were noted in SHR vasculature.
    • Vascular changes were independent of water content and intravenous pressure differences.

    Conclusions:

    • SHR possess significant functional and structural alterations in major veins and pulmonary arteries.
    • These vascular changes are intrinsic and not solely a consequence of elevated systemic or intravenous pressures.
    • Increased blood vessel protein content may underlie these observed vascular modifications in hypertension.

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