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Light and electron microscopic study of the bacterial adhesion to termite flagellates applying lectin cytochemistry

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Summary

Many of the flagellates inhabiting the hindgut of lower termites are associated with ectobiotic, rod-like bacteria or spirochetes. Different types of attachment sites are present. Electron dense material underlies, e.g., the plasma membrane ofJoenia annectens at the contact site, whereas other attachment sites do not show any visible specializations. The host cell's glycocalyx may, however, be reduced at the attachment sites as it is the case inDevescovina glabra. The thick glycocalyx ofStephanonympha nelumbium is not changed at the sites where bacterial rods attach, but spirochetes penetrate to a certain extent. Bacteria which colonize the extracellular surface structures ofMicrorhopalodina multinucleata express their own glycocalyx to mediate a contact. In this study we focussed on the examination of one common mode of interaction between bacteria and their host cells, i.e., adhesion via lectins and sugars. The sugar composition was analysed by light and electron microscopic labelling experiments using the lectins Con A, WGA and SBA. In general, only the posterior body surface ofJoenia which is colonized with bacteria is labelled. The demonstrated sugars are found in fibrous glycocalyx portions surrounding the attachment sites of the bacteria. Such glycocalyx fibres in combination with the electron dense material supporting the attachment sites seem to be the prerequisites for bacterial attachment. InD. glabra, however, a role for sugars in mediating the attachment could not be demonstrated. Removal of the ectobiotes using antibiotics revealed that the specialized contact sites ofJoenia are present in the absence of bacteria and thus possibly serve to attract bacteria. Nothing, however, remains of the former attachment sites in bacteria-freeDevescovina cells. Attachment sites in this case could be induced by bacterial contact. There is not one general mechanism for bacterial attachment to termite flagellates; rather, adhesion seems to follow different strategies.

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Abbreviations

Con:

A concanavalin A

DAB:

3,3′-diaminobenzidine tetrahydrochloride

DAPI:

4′,6-diamidino-2-phenylindole

DIC:

differential interference contrast

FA:

formaldehyde

FITC:

fluorescein isothiocyanate

GA:

glutaraldehyde

PB:

Soerensen's phosphate buffer

PC:

phase contrast

pen/strep:

penicillin and streptomycin

SBA:

soybean agglutinin

SEM:

scanning electron microscope

TBS:

Tris buffer saline

TEM:

transmission electron microscope

WGA:

wheat germ agglutinin

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Dedicated to Prof. Dr. Dr. h.c. Eberhard Schnepf on the occasion of his retirement

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Radek, R., Rösel, J. & Hausmann, K. Light and electron microscopic study of the bacterial adhesion to termite flagellates applying lectin cytochemistry. Protoplasma 193, 105–122 (1996). https://doi.org/10.1007/BF01276639

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