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The ultrastructure of oncolytic spores found on pig skin
Abstract:
A new type of clostridium spore, derived from melanotic hamster tumors treated with pig skin extracts, was examined in a lyophylized form by electron microscopy (EM). Scanning EM indicated that two out of five preparations contained only spores. The spores exhibited oval forms (1.5 X 1.0 MU)with elongated, sometimes infolded, poles indicating an overlying membrane. These structures corresponded to the exosporium as seen by transmission EM. The size of the spores, including the cortex (350-550 A), inner membranes, and cytoplasm averaged 5100 X 5900 A. Cytochemical findings suggest that acid mucopolysaccharides and polypeptides containing N-acetyl-neuraminic acid are localized within the exterior and interior layers of the exosporium and at the surface of the outer coat, which could have a tumor inhibiting effect.
Insights
Researchers identified a novel clostridium spore from hamster tumors. This spore, characterized by electron microscopy, possesses a unique exosporium structure potentially offering tumor-inhibiting properties.
Area of Science:
- Microbiology
- Biotechnology
- Cancer Research
Background:
- Melanotic hamster tumors were treated with pig skin extracts.
- A novel clostridium spore was isolated from these treated tumors.
Purpose of the Study:
- To characterize the morphology and composition of the newly identified clostridium spore.
- To investigate the potential tumor-inhibiting effects of the spore's exosporium.
Main Methods:
- Lyophilized spores were examined using scanning and transmission electron microscopy (EM).
- Cytochemical analysis was performed to determine the localization of specific biomolecules.
Main Results:
- Two of five preparations contained only spores, exhibiting oval shapes (1.5 X 1.0 MU) with distinct exosporium.
- Spore size averaged 5100 X 5900 A, with identified inner structures.
- Acid mucopolysaccharides and N-acetyl-neuraminic acid-containing polypeptides were localized in the exosporium and outer coat.
Conclusions:
- The novel clostridium spore possesses a unique exosporium structure.
- The identified biomolecules in the exosporium may contribute to a tumor-inhibiting effect.