Summary
Pregnant female Swiss albino mice were injected with 0.4 ml of 1% solution of trypan blue on day 7 1/2, 8 1/2, 10 1/2 and 11 1/2 of gestation. Animals were sacrificed 1–6, 24, 48, 72 and 120 hours after injection and the localization of trypan blue granules was determined in histological sections.
Five hours after injection, the dye began to accumulate in the proximal yolk sac epithelium, and within 24 and 48 hours this cell layer was heavily loaded with dye. The dye never became detectable in any other membranes or the embryo proper. This pattern of dye distribution was the same whether injection was initiated at the 7 1/2 8 1/2 day stage of gestation or was delayed until the 10 1/2–11 1/2 day stage.
Histochemical tests for acid phosphatase and monoamine oxidase revealed that the cells of the vitelline membrane from embryos of trypan blue-injected mothers stained very much less intensely than the vitelline membrane tissue from saline-injected controls.
Implications of these observations for theories of action of trypan blue as a teratogenic agent were discussed.
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Dedicated to Professor Berta V. Scharrer on her 60th birthday in friendship and gratitude.
This study was supported by USPHS Research Grant NB 01716 from the National Institute for Neurological Diseases and Blindness, National Institutes of Health and by Grant NIH ST 1 GM 102
This work was carried out in the laboratory of Dr. Max Hamburgh, Department of Anatomy, Albert Einstein College of Medicine, while Dr. Laslo Nebel was a visiting professor on sabbatical leave from the Hebrew University, Hadassah Medical School, Jerusalem, Israel.
Acknowledgment is made to Mr. Dan DiDomizio, who collaborated as a technical assistant in this project, in partial fulfillment for research credit as an undergraduate student in the Department of Biology of the City College of New York.
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Nebel, L., Hamburgh, M. Observations on the penetration and uptake of trypan blue in embryonic membranes of the mouse. Zeitschrift für Zellforschung 75, 129–137 (1966). https://doi.org/10.1007/BF00407150
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DOI: https://doi.org/10.1007/BF00407150