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Scanning electron microscopy of schistosoma japonicum during growth and maturation in mice



Scanning electron microscopy of schistosoma japonicum during growth and maturation in mice



Acta Zoologica Sinica 31(2): 138-142



Schistosomula on days 1, 2, 4, 6, 8, 10, 14, 17, 18, 21 postinfection and sexually nature worms on days 28 and 43 were obtained from the skin, lungs, liver and portalmesenteric veins of mice artifically infected with cercariae of the Chinese mainland strain of Schistosoma japonicum. Dozens of worms were scanned from infection on each of the days listed. Our results provide a detailed account of the changes and metamorphosis that occur on the body appearance and surface from the time the worms first appear in the skin to the time when they migrate and mature to the portal-mesenteric veins. These changes involve: increases in the number and height of tegumental ridges; changes in the number and location of tegumental spines, and modification in the number and distribution of tegumental sensory papillae. The apical area that had borne the gland openings is gradually resolved, and the mouth just behind the head organ subsequently becomes incorporated into the oral sucker. At the posterior end of the body there is a prominent tail-socket wound left by the breakage of the tail; at 2 days post-infection the areas have healed and bear a central prominence containing the excitatory pore. With the advance of the development, the excretory pore is well-defined in schistosomula on day 14. In the mature worm of both sexes, the posterior end and the area around the excretory pore bear numerous sensory papillae distributed irregularly. Investigations on the surface topography of S. japonicum described above give us an idea that the body-shape and a number of changes in tegument of schistosomula during maturation in the mouse appear to be special adaptations to life within the blood-vessels of the definitive hosts.

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Accession: 006365782

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