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J. Bacteriol., 09 1995, 5358-5363, Vol 177, No. 18
Copyright © 1995, American Society for Microbiology

Cytochemical localization of glycogen in Chlamydia trachomatis inclusions

ML Chiappino, C Dawson, J Schachter and BA Nichols
Francis I. Proctor Foundation for Research in Ophthalmology, University of California, San Francisco 94143, USA.

The origin and distribution of glycogen in inclusions of Chlamydia trachomatis were demonstrated with silver proteinate stain for electron microscopy. Glycogen particles were detected in all developmental stages of C. trachomatis, as well as free in the inclusions. Intrachlamydial glycogen was most common in elementary bodies but was also detected in intermediate forms and reticulate bodies (RBs). Abnormal divisions and breakdown of cytoplasmic membranes were common in RBs. Cytoplasmic contents, including glycogen particles, were released into the inclusions after rupture of the outer membranes of abnormal RBs and intermediate forms. From these observations, we conclude that glycogen in inclusions of C. trachomatis originates in the organisms themselves.


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