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Infection and Immunity, August 2004, p. 4859-4863, Vol. 72, No. 8
0019-9567/04/$08.00+0     DOI: 10.1128/IAI.72.8.4859-4863.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Human Diffusely Adhering Escherichia coli Expressing Afa/Dr Adhesins That Use Human CD55 (Decay-Accelerating Factor) as a Receptor Does Not Bind the Rodent and Pig Analogues of CD55

Sylvie Hudault,1 O. Brad Spiller,2 B. Paul Morgan,2 and Alain L. Servin1*

Institut National de la Santé et de la Recherche Médicale (INSERM), Unité 510, Faculté de Pharmacie Paris XI, F-92296 ChÂtenay-Malabry, France,1 Complement Biology Group, Department of Medical Biochemistry, University of Wales College of Medicine, Cardiff, United Kingdom2

Received 12 January 2004/ Returned for modification 17 March 2004/ Accepted 5 April 2004


   ABSTRACT
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Afa/Dr diffusely adhering Escherichia coli (DAEC) bacteria that are responsible for recurrent urinary tract and gastrointestinal infections recognized as a receptor the glycosylphosphatidylinositol (GPI)-anchored protein decay-accelerating factor (DAF; CD55) at the brush border of cultured human intestinal cells. Results show that Afa/Dr DAEC C1845 bacteria were poorly associated with the mucosa of the gastrointestinal tract of infected mice. We conducted experiments with Chinese hamster ovary (CHO) cells stably transfected with mouse (GPI or transmembrane forms), pig, or human CD55 or mouse Crry cDNAs or transfected with empty vector pDR2EF1{alpha}. Recombinant E. coli AAEC185 bacteria expressing Dr or F1845 adhesins bound strongly to CHO cells expressing human CD55 but not to the CHO cells expressing mouse (transmembrane and GPI anchored), rat, or pig CD55 or mouse Crry. Positive clustering of CD55 around Dr-positive bacteria was observed in human CD55-expressing CHO cells but not around the rarely adhering Dr-positive bacteria randomly distributed at the cell surface of CHO cells expressing mouse, rat, or pig CD55.


   TEXT
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Several microbial pathogens have been found to hijack human CD55 (decay-accelerating factor [DAF]) directly to infect the host cells or indirectly as signaling molecules (via proteins associated with the glycosylphosphatidylinositol [GPI] anchor) to establish molecular cross-talk with the mammalian target cells and trigger cellular responses. Among human pathogenic Escherichia coli bacteria (23), the Afa/Dr diffusely adhering E. coli strains (DAEC) are responsible for recurrent urinary tract and gastrointestinal infections in humans (39). This subclass of pathogenic E. coli expressed a family of gene operons with similar genetic organizations consisting of at least five genes, including the afa, dra, and daa genes. The last gene, gene E, encodes the major structural AfaE-I (29), AfaE-III (31), DraE (35), DraE-II (45), and DaaE (6) proteins that function as adhesins. All these adhesins recognized CD55 as a receptor (36, 37, 45). AfaE-VII and AfaE-VIII, two other Afa/Dr adhesins encoded by the afa-7 and afa-8 gene clusters and expressed mostly by bovine isolates (14, 30), have been recently identified. These animal afa gene clusters are plasmid and chromosome borne and are expressed by strains that produced other virulence factors such as cytonecrotizing factor toxins and F17, pyelonephritis-associated pilus, and CS31A adhesins. It was noticed that AfaE-VIII adhesin has been found in human E. coli (14) but has never been detected in diarrhea-associated human isolates (32). Importantly, in contrast with AfaE-I, AfaE-III, Dr, Dr-II, and F1845 adhesins, both AfaE-VII and AfaE-VIII adhesins failed to recognize the human CD55 molecule as a receptor, and the mechanism(s) of pathogenicity of E. coli harboring these two adhesins remain currently unknown.

CD55 is a molecule attached to the outer leaflet of the cell membrane by a GPI anchor and contains four complement control protein repeats (CCPs) followed by a serine/threonine-rich, heavily O-glycosylated C-terminal domain that serves as a nonspecific spacer projecting the molecule at the membrane surface. CD55 plays a central role in regulating the complement system by dissociating autologous C3 convertases responsible for cleaving C3, which assemble on self-cell surfaces (8, 28, 34). The classical pathway regulatory activity of CD55 resides in CCP2 and CCP3, while its alternative pathway regulatory activity resides in CCP2, CCP3, and CCP4 (12). It has been recently reported that decay-accelerating activity maps to a single face of the molecule whereas microbial pathogens recognize a variety of different sites on CD55 (61). In the case of Afa/Dr DAEC, E. coli bacteria bearing AfaE-I, AfaE-III, Dr, and F1845 adhesins primarily recognized CCP3 of human CD55 (with some contribution of CCP2) whereas E. coli bacteria bearing Dr-II adhesin recognized CCP4 (36, 44). Residues important to binding of DraE adhesin in the 148-to-171 loop at the surface of CD55 CCP3 were distinct (approximately 20 A apart) from those important to complement regulation (20). Finally, it has been shown that individual amino acid changes at positions 10, 63, 65, 75, 77, 79, and 131 on the major structural subunit DraE significantly reduced its CD55 binding capacity (57).

In culture-grown polarized epithelial intestinal cells that express CD55 at the brush border (2), infection by human Afa/Dr DAEC promoted cytoskeleton rearrangements (3, 17, 42), functional cellular injuries (40, 41), and proinflammatory responses (4, 5, 55). Most of these cellular injuries and responses follow the recognition of CD55 by Afa/Dr adhesins. Regarding these in vitro results, we conducted an experiment to examine in vivo the intestinal colonization and the epithelial cell injuries. For this purpose, we infected conventional mice with the human Afa/Dr DAEC strain C1845 (6) since conventional mice have been previously used to analyze the renal injuries by human uropathogenic Dr-positive E. coli (15, 26). Adult female germfree C3H/He/Oujco mice (Cesal, Orléans, France) 7 to 8 weeks of age previously used to investigate intestinal colonization by commensal E. coli (22) were orally infected. Results reported in Table 1 show that in infected mice an increase from proximal to distal intestine is observed for E. coli levels in both intestinal luminal content and corresponding washed tissue. Chappuis et al. (10) have previously demonstrated that mucosa-adhering bacteria are found in vivo at least at the same levels in the washed mucosa and in the intestinal content. Results show that C1845 bacteria were poorly associated with the mucosa of the gastrointestinal tract of infected mice, since the number of tissue-associated bacteria was always 10 or 100 times lower than in the intestinal contents. Therefore, our results indicate that there is no specific attachment of Afa/Dr DAEC strain C1845 to the murine intestinal epithelium. In addition, it should be noted that no sign of diarrhea and no sign of inflammation was found in the intestinal epithelium of C1845-infected mice.


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  		TABLE 1. Intestinal colonization in germfree mice infected with human E. coli strain C1845

 
The results reported above showing that human E. coli bacteria expressing F1845 adhesin are not able to colonize the gastrointestinal epithelium of mice prompted us to examine whether or not this adhesin recognized mouse CD55. For this purpose, we conducted experiments with Chinese hamster ovary (CHO) cells stably transfected with mouse (GPI or transmembrane [TM] form) cDNAs (53). For a negative control, we used CHO cells transfected with empty vector pDR2EF1{alpha}. For a positive control, we used CHO cells stably transfected with human CD55 cDNA (53). CHO cells transfected with empty vector pDR2EF1{alpha} or human or mouse GPI or TM forms were grown in Dulbecco modified Eagle medium-Ham's F12 with L-glutamine (Invitrogen) supplemented with 5% fetal calf serum and 100 µg of hygromycin B (Invitrogen)/ml at 37°C in an atmosphere containing 5% CO2. The cells were infected with a recombinant E. coli strain obtained by transforming the E. coli AAEC185 strain (7), which lacks type 1 pili, with the recombinant plasmid that encodes F1845 adhesin (6). Bacteria were grown in cultures in Luria-Bertani broth at 37°C for 18 h with appropriate antibiotic. For each experiment, bacteria were washed three times with sterile phosphate-buffered saline (PBS) and recovered with Hanks' balanced salt solution (Invitrogen). Cells were inoculated with 108 CFU/ml, corresponding to a multiplicity of infection of 100 bacteria per cell. Infected monolayers were incubated for 3 h at 37°C in a humidified atmosphere containing 5% CO2. At the end of infection, monolayers were washed four times with sterile PBS to remove nonadhering bacteria and either fixed for immunofluorescence labeling or processed further to determine cell-associated CFU levels (CFU/milliliter). To quantitate total cell-associated bacteria, washed monolayers were lysed with 1% saponin for 10 min. Bacteria were suspended by vigorous pipetting, and levels of CFU/milliliter in the lysates were determined by plating of serial dilutions.

As shown in Fig. 1, recombinant E. coli bacteria expressing F1845 adhesin bound strongly onto CHO cells expressing human CD55 but not onto the CHO cells expressing mouse (TM and GPI anchored) CD55. This result prompted us to examine whether or nor other Afa/Dr adhesins such as Dr hemagglutinin (9) lack recognition of mouse CD55. For this purpose, transfected CHO cells were infected with recombinant E. coli bacteria obtained by transforming the E. coli AAEC185 strain with the recombinant plasmid that encodes Dr hemagglutinin. As shown in Fig. 1, Dr hemagglutinin did not recognize the TM- and GPI-anchored forms of mouse CD55. We examined whether or not Dr and C1845 adhesins recognized the rat and pig CD55 in CHO cells stably transfected with rat or pig CD55 cDNAs (53). In addition, considering that in mice, Crry is an evolutionarily unique, complement-regulatory protein that functions like CD55 to inhibit classical complement pathway C3 deposition on cell membranes (13, 27, 33, 48, 49), we examined whether or not Dr and F1845 adhesins bound onto the stably transfected CHO cells with mouse Crry cDNA. Results in Fig. 1 show that both Dr and C1845 failed to recognize the rat and pig CD55. Moreover, results show that Crry is not recognized as a receptor by recombinant E. coli bacteria expressing Dr or F1845 adhesins (indexes of adhesion for the AAEC strain, 0.037 ± 0.005; for P1-Dr, 0.015 ± 0.009; and for P1-F1845, 0.006 ± 0.002).



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  		FIG. 1. Recognition of human, rodent, and pig CD55 as receptor by Dr and F1845 adhesins. CHO cell lines expressing each CD55 were plated to confluency. Cell monolayers were inoculated with 108 bacteria/ml (E. coli strain AAEC185 [control] or recombinant strain AAEC185 expressing Dr [P1-Dr] or F1845 [P1-F1845]). After 3 h at 37°C monolayers were processed to determine CFU levels/milliliter. Indexes of cell-associated bacteria (CFU/milliliter) per cell line were calculated on the basis of the higher cell association level obtained for F1845-positive strain (P1-F1845) in CHO-human CD55 (vector-CHO, 1.58 x 104 ± 0.68 x 104 CFU/ml; human CD55-CHO, 1.85 x 106 ± 0.55 x 106 CFU/ml). Data shown represent mean results ± standard deviations of 10 experiments for each cell line. Similar results were obtained with human wild-type IH11128 and C1845 bacteria expressing Dr hemagglutinin and F1845 adhesin, respectively (data not shown).

 
Clustering of human membrane-bound CD55 around human Afa/Dr DAEC bacteria adhering onto HeLa cells has been previously observed (16, 17). Transfected CHO cells infected with recombinant Dr-positive E. coli were processed for immunofluorescence labeling of human, rat, mouse, or pig CD55 with corresponding monoclonal antibodies (MAbs) (53) (Fig. 2). Positive clustering around Dr-positive bacteria was observed in human CD55-expressing CHO cells. In contrast, for the rarely adhering Dr-positive bacteria randomly distributed at the surface of CHO cells expressing mouse, rat, or pig CD55 CHO cells, no CD55 clustering developed around bacteria.



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  		FIG. 2. Observation of adherent F1845-positive bacteria and recruitment of CD55 in CHO cell lines expressing human, mouse, rat, or pig CD55. Left column, phase-contrast micrographs; right column, indirect immunofluorescence labeling of human, mouse, rat, and pig CD55 conducted with corresponding MAbs. Micrographs show optical sections (0.5 µm) representative of the apical part of the cells. Indirect immunofluorescence labeling of CHO cells transfected with human, mouse, rat, or pig CD55 cDNAs with corresponding MAbs shows a homogeneous distribution of a fine, punctuate labeling characteristic of GPI-anchored proteins. Clustering of positive immunofluorescence around F1845-positive bacteria was only observed in CHO cells transfected with human CD55 cDNA. Note that no labeling was found around F1845-positive bacteria plated on a glass coverslip and subjected to immunofluorescence labeling with anti-CD55 antibodies (data not shown).

 
Human CD55 functions as receptor for microbial pathogens, including Afa/Dr DAEC and several strains of enterovirus (24, 25, 47), coxsackievirus B (CVB) (50-52), and echovirus (EV) (1, 11, 21, 46, 54). CV strain A21 and enterovirus strain 70 were found to require sequences in CCP1 for binding (24, 50), while the majority of CD55-binding enteroviruses require CCP3 and CCP4 (47), although EV7 binding may require CCP2, CCP3, and CCP4 (11, 21). The specificity of binding with respect to Afa/Dr adhesins observed here resembles the specificity of binding of EV and CVB. Indeed, we have previously investigated enterovirus binding to transfected CHO cells abundantly expressing rodent or human CD55 and found EV serotypes 3, 6', 7, 11 to 13, and 29 and CVB serotypes 1, 3, and 5 only recognized cells that expressed human CD55 (53). Molecular cloning of mouse CD55 has identified two forms of the molecule, one TM form and the other GPI anchored, and CHO cells expressing either form were protected from attack with mouse or rat complement (18). The pig analogue of CD55 only comprised three CCPs homologous with the amino-terminal three CCPs in human CD55 (therefore missing the equivalent to human CD55 CCP4), a serine/threonine-rich region, a TM domain, and a cytoplasmic tail (43). Although mouse and rat CD55 only have amino acid identities to human CD55 of approximately 60%, they function to inhibit complement as human CD55 (18, 53). Interestingly, human and rodent analogues of CD55 are not species restricted and highlight interesting differences in the capacity to regulate alternative and classical pathways (19). Consistent with the failure to bind rodent CD55, EV serotypes 3, 6', 7, 11 to 13, and 29 and CBV serotypes 1, 3, and 5 were found to hemagglutinate human erythrocytes but not rat or mouse erythrocytes (53). Regarding these previous results and the results reported here, it is interesting that identical characteristics with respect to specificity of binding onto human CD55 have been developed by pathogenic bacteria and viruses.

Our results raise several questions concerning the animal models previously used to examine the pathogenicity of human Afa/Dr DAEC. It has been reported that the infection of mice with the human wild-type E. coli strain IH11128 bearing Dr adhesin induces tubulointerstitial nephritis, including interstitial inflammation, fibrosis, and tubular atrophy in the kidney tissue (15), and induces preterm delivery in pregnant mice (26). Goluszko et al. (15) reported that the renal interstitial E. coli binding mediated by Dr adhesin may be important for the development of chronic pyelonephritis. Indeed, an insertional inactivation of draC involved in assembly of functional adhesins of Afa/Dr family resulted in a dramatic decrease in expression of draE and the mutant strain DR14 fails to colonize the renal interstitium and to develop the histological changes. Importantly, a complementation of dra mutation restores both binding and lesions at the level of wild-type clinical isolate IH11128. Our results showing that Dr adhesin does not bind mouse CD55 do not support a mechanism involving the binding onto mouse CD55 for the colonization of renal tissue and the induction of interstitial inflammation, fibrosis, and tubular atrophy in mouse kidney tissue by human Dr-positive wild-type strain IH11128 bacteria. To explain the intriguing renal epithelial cell colonization by Dr-positive bacteria in mice (15, 26), it may be possible that another type of adhesion specific for renal epithelial cells exists in human uropathogenic Afa/Dr DAEC which remains to be characterized. One member of the family of human E. coli strains expressing Afa/Dr adhesins, the Dr-positive wild-type uropathogenic strain IH11128, has also acquired binding specificity for type IV collagen (9, 38, 56, 59, 60). Interestingly, Weissman et al. (58) indicated that the type-IV-collagen-binding phenotype is crucial for E. coli virulence in the mouse model of chronic pyelonephritis (R. Selvarangan et al., unpublished data).


   ACKNOWLEDGMENTS
 
We are grateful to R. Amsellem for her expert assistance in cell culture. We are also indebted to V. Nicolas for her kindly help in confocal image analysis (Imagerie Cellulaire, IFR75-ISIT, Faculté de Pharmacie Paris XI).


   FOOTNOTES
 
* Corresponding author. Mailing address: Unité 510 INSERM, Faculté de Pharmacie Paris XI, F-92296 ChÂtenay-Malabry, France. Phone: 33 1 46 83 56 61. Fax: 33 1 46 83 58.44. E-mail: alain.servin{at}cep.u-psud.fr. Back

Editor: V. J. DiRita


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Infection and Immunity, August 2004, p. 4859-4863, Vol. 72, No. 8
0019-9567/04/$08.00+0     DOI: 10.1128/IAI.72.8.4859-4863.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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