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The feeding mechanism of avian malarial parasites.
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MedLine Citation:
PMID:  5914696     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Electron microscope studies of the erythrocytic forms, including gametocytes and asexual schizonts, of the protozoa Plasmodium fallax, P. lophurae, and P. cathemerium, have revealed a "cytostome," a specialized organelle of the pellicular membrane which is active in the ingestion of host cell cytoplasm. In material fixed in glutaraldehyde and postfixed in OsO(4), the cytostome appears in face view as a pore limited by two dense circular membranes and having an inside diameter of approximately 190 mmicro. In cross-section, the cytostome is a cavity bounded on each side by two dense segments corresponding to the two dense circles observed in face view; its base consists of a single unit membrane. In the process of feeding, the cytostome cavity enlarges by expansion of its membrane, permitting a large quantity of red cell cytoplasm to come into contact with the cytostome wall. Subsequent digestion of erythrocyte cytoplasm occurs exclusively in food vacuoles which emanate from the cytostome invagination. As digestion progresses, the food vacuoles initially stain more densely and there is a marked build-up of hemozoin granules. In the final stage of digestion, a single membrane surrounds a cluster of residual pigment particles and very little of the original host cell cytoplasm remains. The cytostome in exoerythrocytic stages of P. fallax has been observed only in merozoites and does not seem to play the same role in the feeding mechanism.
Authors:
M Aikawa; P K Hepler; C G Huff; H Sprinz
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of cell biology     Volume:  28     ISSN:  0021-9525     ISO Abbreviation:  J. Cell Biol.     Publication Date:  1966 Feb 
Date Detail:
Created Date:  1966-12-03     Completed Date:  1966-12-03     Revised Date:  2010-06-22    
Medline Journal Info:
Nlm Unique ID:  0375356     Medline TA:  J Cell Biol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  355-73     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Malaria, Avian*
Microscopy, Electron
Plasmodium / cytology*
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Full Text
Journal Information
Journal ID (nlm-ta): J Cell Biol
ISSN: 0021-9525
ISSN: 1540-8140
Publisher: The Rockefeller University Press
Article Information
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Received Day: 24 Month: 8 Year: 1965
Print publication date: Day: 1 Month: 2 Year: 1966
Volume: 28 Issue: 2
First Page: 355 Last Page: 373
ID: 2106916
PubMed Id: 5914696

THE FEEDING MECHANISM OF AVIAN MALARIAL PARASITES
Masamichi Aikawa
Peter K. Hepler
Clay G. Huff
Helmuth Sprinz
From the Department of Experimental Pathology, Walter Reed Army Institute of Research, Washington, D. C., and the Department of Parasitology, Naval Medical Research Institute, Bethesda, Maryland


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