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Aging in Caenorhabditis Briggsae

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image of Nematologica
For more content, see Nematology.

Caenorhabditis briggsae was used as a model to study aging of a metazoan under gnotobiotic conditions. At higher temperatures nematodes were shorter-lived and had a shorter generation time. Nematodes moved more slowly as they aged. Physiologic aging was marked by a decreased ability to withstand osmotic stress, a possible increase in the body's internal solute concentration, and increased sensitivity to formaldehyde. These results suggest that the ability to osmoregulate and the permeability of the body wall are altered during senescence. The interchordal hypodermis, as well as the chordal hypodermis, contained fairly abundant structures having biosynthetic activity. During aging mitochondria of the hypodermis degenerated, some areas of the thin hypodermal band thickened and lysosome-like bodies formed in the interchordal hypodermis. Changes in osmoregulatory and excretory mechanisms are probably associated with deterioration of the hypodermis organelles.

Affiliations: 1: ) Laboratory of Experimental Biology, University of Massachusetts, East Wareham, Massa-chusetts, U.S.A.; 2: ) Department of Biological Ultrastructure, Weizmann Institute, Rehovot, Israel; 3: ) Department of Chemistry, Technion, Haifa, Israel


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