Surface components of shigellae involved in adhesion and haemagglutination.
Strains of Shigella species were studied for their ability to adhere and agglutinate mammalian erythrocytes. Shigella dysenteriae and Sh. flexneri exhibited haemagglutinating (HA) properties when cultured in Casamino Acids-Yeast Extract (CYE) broth in the presence of 1 mmol 1-1 calcium chloride, but other shigellae did not show this property under the same culture conditions. Repeated subcultivation of Sh. boydii, Sh. sonnei and HA negative strains of Sh. dysenteriae and Sh. flexneri in CYE broth medium induced adhesive and haemagglutinating properties that were inhibited by sodium periodate. HA activities of Shigella spp. were also inhibited by N-acetylneuraminic acid, alpha 1-glycoprotein and fetuin, but not by protease. Electron microscopy of Sh. dysenteriae 1, Sh. flexneri 2a, Sh. boydii 12 and Sh. sonnei 1 grown in CYE broth showed the presence of an extracellular slime layer that promoted agglutination of erythrocytes. The slime layer extracted from the cell surface of Shigella spp. showed HA properties, whereas lipopolysaccharide (LPS) obtained from the same strains, except Sh. dysenteriae 1, did not agglutinate erythrocytes. This evidence suggests that the cell surface haemagglutinin is a loosely bound slime layer which is expressed in CYE broth medium.
Haque
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MA
Department of Microbiology, Saga Medical School, Japan.
Qadri
F
F
Ohki
K
K
Kohashi
O
O
D000818:Animals; D001422:Bacterial Adhesion; D016667:Bacterial Capsules / Q000737:chemistry / Q000502:physiology*; D002241:Carbohydrates / Q000494:pharmacology; D003470:Culture Media; D004492:Edetic Acid / Q000494:pharmacology; D004912:Erythrocytes / Q000378:metabolism; D006168:Guinea Pigs; D006384:Hemagglutination; D006385:Hemagglutination Inhibition Tests; D006801:Humans; D008070:Lipopolysaccharides / Q000737:chemistry; D008854:Microscopy, Electron; D009961:Orosomucoid / Q000494:pharmacology; D010504:Periodic Acid / Q000737:chemistry; D011817:Rabbits; D012760:Shigella / Q000235:genetics / Q000254:growth & development / Q000502:physiology* / Q000648:ultrastructure; D013997:Time Factors; D000509:alpha-Fetoproteins / Q000494:pharmacology
D002241:Carbohydrates; D003470:Culture Media; D008070:Lipopolysaccharides; D009961:Orosomucoid; D000509:alpha-Fetoproteins; D010504:Periodic Acid; D004492:Edetic Acid; C009288:metaperiodate