Role of colanic acid polysaccharide in serum resistance in vivo and in adherence

Arleen J. Lopez-Torres, Valerie Stout

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The production of an extracellular layer of polysaccharide, termed the capsule, is a common feature of many bacteria. Capsules play a vital role in permitting evasion of the host immune specific and nonspecific defenses as well as helping in adhesion for colonization of host tissue. Colanic acid capsule is usually produced in low quantities and is a common feature of several enteric bacteria. The role of the colanic acid capsule in aiding adhesion and virulence was investigated. Encapsulated and unencapsulated cells were injected into granuloma pouches that were formed on the backs of rats. During the first 50 h, the viability of the matched encapsulated and unencapsulated cells decreased. These studies showed that colanic acid capsule does not confer resistance to the bactericidal activity of serum or to phagocytosis in vivo, since there was no significant difference in the survival rates of both strains over time. Adherence studies were conducted in monolayers of human carcinoma intestinal cells (T84) with the same matched strains. After incubating radioactively labeled bacteria with the colon cells, the level of adherence was determined by measuring the radioactivity remaining in the tissue culture wells. The results of these experiments indicated that the unencapsulated cells adhered more readily to the intestinal cells, suggesting that colanic acid capsule interferes with adherence in this model system.

Original languageEnglish (US)
Pages (from-to)383-389
Number of pages7
JournalCurrent Microbiology
Volume33
Issue number6
DOIs
StatePublished - 1996

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Capsules
Polysaccharides
Serum
Bacteria
Immune Evasion
Enterobacteriaceae
Granuloma
Phagocytosis
Radioactivity
Virulence
colanic acid
Colon
Carcinoma

ASJC Scopus subject areas

  • Microbiology

Cite this

Role of colanic acid polysaccharide in serum resistance in vivo and in adherence. / Lopez-Torres, Arleen J.; Stout, Valerie.

In: Current Microbiology, Vol. 33, No. 6, 1996, p. 383-389.

Research output: Contribution to journalArticle

Lopez-Torres, Arleen J. ; Stout, Valerie. / Role of colanic acid polysaccharide in serum resistance in vivo and in adherence. In: Current Microbiology. 1996 ; Vol. 33, No. 6. pp. 383-389.
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