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Ultrastructural postmortem changes in chicken kidneys at 27 C.

T P Brown, O J Fletcher

    Avian Diseases
    |April 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

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    Postmortem changes in chicken kidneys begin rapidly, with early cell swelling and organelle changes within minutes. These ultrastructural alterations reveal significant tissue damage even in samples appearing normal under light microscopy.

    Area of Science:

    • Renal Histology
    • Ultrastructural Pathology
    • Avian Biology

    Background:

    • Light microscopy can misinterpret early postmortem kidney changes.
    • Understanding the timeline of cellular degradation is crucial for accurate research.
    • Avian kidney physiology presents unique aspects for study.

    Purpose of the Study:

    • To meticulously document the ultrastructural postmortem changes in adult chicken renal tissues.
    • To establish a precise timeline for these alterations across different kidney segments.
    • To differentiate early cellular damage from baseline histology.

    Main Methods:

    • Adult chickens were euthanized and tissues fixed at precise postmortem intervals (0-360 minutes) at 27°C.
    • Transmission electron microscopy was employed to examine glomeruli, proximal tubules (PT), distal tubules (DT), and cortical collecting ducts (CD).

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  • Detailed ultrastructural analysis focused on cellular morphology, organelle integrity, and nuclear changes.

    • Main Results:

    • Early apical swelling of PT and DT epithelium and glomerular endothelial projections were observed within minutes.
    • Mitochondrial and endoplasmic reticulum dilation, along with flocculent densities, appeared by 5-10 minutes.
    • Nuclear changes, including margination, clumping, pyknosis, and karyorrhexis, progressed over time, with significant differences between nephron segments.
    • Glomerular basement membrane changes were noted by 30 minutes, with limited progression thereafter.

    Conclusions:

    • Significant ultrastructural renal pathology occurs rapidly postmortem in chickens, even at mild ambient temperatures.
    • The observed changes, particularly in tubular segments, indicate rapid cellular breakdown affecting organelle and nuclear integrity.
    • These findings highlight the critical importance of rapid tissue fixation in avian renal research to ensure data validity.