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. 1991 Nov;59(11):3895–3902. doi: 10.1128/iai.59.11.3895-3902.1991

Intramacrophagic Mycobacterium avium bacilli are coated by a multiple lamellar structure: freeze fracture analysis of infected mouse liver.

S Rulong 1, A P Aguas 1, P P da Silva 1, M T Silva 1
PMCID: PMC258974  PMID: 1937749

Abstract

We used freeze fracture electron microscopy to study the fine structure of Mycobacterium avium inside phagosomes of murine macrophages. M. avium-susceptible C57BL/6 mice were infected with M. avium by intraperitoneal inoculation of 10(8) viable bacilli. We studied the microanatomy of the mycobacteria in 3-month infections of mice, a situation in which bacillary multiplication is extensive. In these samples, freeze fracture revealed that intraphagosomal bacilli were surrounded by a multilamellar coat that was apposed to the cell wall. In thin sections, in contrast, the area corresponding to the coat showed no substructure and was electron transparent (the so-called electron-transparent zone that has been previously reported by others). The multiple lamellae resembled an onionlike assembly that was inserted in between the mycobacterial wall outer surface and the phagosomal membrane. Each lamella of the M. avium coat was made up of parallel straight fibrils with a width of 5 nm. A variable number of lamellae, sometimes up to 10 or more elements, coated individual bacilli. The multilamellar coat was absent around both extracellular M. avium and intramacrophagic M. avium after short-term (45-min) inoculation of mice. The supramolecular organization of the M. avium lamellar coat as viewed here by freeze fracture is similar to that of purified mycoside C (P. Draper, J. Gen. Microbiol. 83:431-433, 1974; K.-S. Kim, M.R.J. Salton, and L. Barksdale, J. Bacteriol. 125:739-743, 1976), a mycobacterial component currently known as glycopeptidolipid (W.W. Barrow and P.J. Brennan, J. Bacteriol. 150:381-384, 1982). We conclude that M. avium bacilli growing in macrophages are surrounded by multilamellar capsulelike structures that contain glycopeptidolipid molecules.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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