Interstitial complement C3 activation and macrophage infiltration in patients with hypertensive nephropathy


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Phenotypic Characterization of Macrophages from Rat Kidney by Flow Cytometry
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Jiong Cui, Jianxin Wan, Danyu You

    Clinical Nephrology
    |August 11, 2017
    PubMed

    Insights

    Hypertensive nephropathy (HN) involves increased complement C3 and macrophage infiltration in the kidneys. These factors correlate with kidney damage and declining renal function, highlighting their role in HN progression.

    Area of Science:

    • Nephrology
    • Immunology
    • Pathology

    Background:

    • Hypertensive nephropathy (HN) pathogenesis involves interstitial complement C3 activation and macrophage infiltration.
    • Limited human data exist on these factors in HN.
    • Investigating C3 and macrophages in HN is crucial for understanding kidney damage.

    Purpose of the Study:

    • To investigate interstitial complement C3 expression and macrophage infiltration in human HN.
    • To examine the relationships between C3 activation, macrophage infiltration, and clinicopathologic data.
    • To assess the association with changes in renal function.

    Main Methods:

    • Immunohistochemistry was used to analyze renal tissue from 20 HN patients and 40 controls.
    • Complement C3, angiotensin (AGT), angiotensin II, and CD68 (macrophage marker) levels were measured.
    • Clinicopathologic data including serum creatinine, eGFR, and lesion scores were recorded.

    Main Results:

    • HN patients exhibited elevated interstitial C3, AGT, angiotensin II, and macrophage infiltration compared to controls.
    • Enhanced interstitial C3 correlated significantly with macrophage density, serum creatinine, and kidney damage scores.
    • C3 expression was inversely correlated with eGFR and its rate of change.

    Conclusions:

    • Complement C3 activation and macrophage infiltration play significant roles in human HN pathogenesis.
    • The interaction between C3 and macrophages contributes to interstitial fibrosis and kidney damage progression.
    • These findings offer insights into the inflammatory mechanisms underlying HN.
    Abstract

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