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Related Experiment Videos

Electron microscopic observations on rat epidermis during experimental carcinogenesis

A Lupulescu, H Pinkus

    Oncology
    |January 1, 1976
    PubMed
    Summary

    Early skin cancer development in rats shows similar cellular changes, including increased ribosomes, mitochondria, and endoplasmic reticulum, regardless of tumor type. These findings suggest a multi-stage process in carcinogenesis.

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    Area of Science:

    • Dermatology
    • Oncology
    • Cell Biology

    Background:

    • Chemical carcinogens induce skin tumors through complex cellular alterations.
    • Understanding early ultrastructural changes is crucial for elucidating carcinogenesis.
    • Rat epidermis is a model for studying skin cancer development.

    Purpose of the Study:

    • To investigate early ultrastructural changes in rat epidermis after carcinogen exposure.
    • To compare these early changes with established tumor cell ultrastructure.
    • To propose a model for neoplastic evolution in skin.

    Main Methods:

    • Topical application of 3-methylcholanthrene to rat epidermis.
    • Ultrastructural analysis using electron microscopy.
    • Comparative analysis of normal epidermis, early altered epidermis, and developed tumors.

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    Main Results:

    • Early and late-stage tumors exhibited similar cytologic alterations.
    • Key changes included increased ribosomes, polysomes, endoplasmic reticulum, and mitochondria.
    • Dilated intercellular spaces with cytoplasmic projections were observed.
    • A predominance of 'dark cells' (phenotypically altered) was noted.

    Conclusions:

    • A common pathway exists for early cellular changes in chemically induced skin tumors.
    • The observed ultrastructural features suggest a multi-stage neoplastic evolution.
    • Phenotypic variations like 'dark cells' are part of the carcinogenic process.