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KOYAMA S, ITO K, USAMI K, WADA S, YAMASHITA T, IKEDA-OHTSUBO W, KITAZAWA H, HIRAKAWA R, ISLAM J, FURUKAWA M, NOCHI T. Broad specificity of monoclonal IgA (TEPC15-IgA) for enteric bacteria via phosphorylcholine-mediated interaction. J Vet Med Sci 2024; 86:801-808. [PMID: 38839348 PMCID: PMC11251817 DOI: 10.1292/jvms.23-0441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2023] [Accepted: 05/13/2024] [Indexed: 06/07/2024] Open
Abstract
Immunoglobulin A (IgA) is notable for its broad specificity toward multiple bacteria. Phosphorylcholine (PC) plays a role in the infection of pathogenic bacteria carrying PC and in the induction of IgA responses in the host immune system. The commercially available mouse monoclonal IgA, TEPC15-IgA, is a distinctive antibody with specificity for PC, warranting further exploration of its response to PC-bearing enteric bacteria. In this study, using 17 different enteric bacteria, including 3 aerobic and 14 anerobic bacteria that could be cultured in vitro, we confirmed that TEPC15-IgA recognizes 4 bacterial species: Lactobacillus taiwanensis, Limosilactobacillus frumenti, Streptococcus infantis, and Escherichia coli, although reactivity varied. Interestingly, TEPC15-IgA did not react with four of six Lactobacillus species used. Moreover, distinct target molecules associated with PC in L. taiwanensis and L. frumenti were evident, differing in molecular weight. These findings suggest that the natural generation of PC-specific IgA could prevent PC-mediated infections and potentially facilitate the formation of a microflora rich in indigenous bacteria with PC, particularly in the gastrointestinal tract.
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Affiliation(s)
- Saeka KOYAMA
- International Education and Research Center for Food and Agricultural Immunology, Graduate School of Agricultural Science, Tohoku University, Miyagi,
Japan
| | - Kaori ITO
- International Education and Research Center for Food and Agricultural Immunology, Graduate School of Agricultural Science, Tohoku University, Miyagi,
Japan
| | - Katsuki USAMI
- International Education and Research Center for Food and Agricultural Immunology, Graduate School of Agricultural Science, Tohoku University, Miyagi,
Japan
| | - Shino WADA
- International Education and Research Center for Food and Agricultural Immunology, Graduate School of Agricultural Science, Tohoku University, Miyagi,
Japan
| | - Tsukasa YAMASHITA
- International Education and Research Center for Food and Agricultural Immunology, Graduate School of Agricultural Science, Tohoku University, Miyagi,
Japan
| | - Wakako IKEDA-OHTSUBO
- International Education and Research Center for Food and Agricultural Immunology, Graduate School of Agricultural Science, Tohoku University, Miyagi,
Japan
| | - Haruki KITAZAWA
- International Education and Research Center for Food and Agricultural Immunology, Graduate School of Agricultural Science, Tohoku University, Miyagi,
Japan
| | - Ryota HIRAKAWA
- International Education and Research Center for Food and Agricultural Immunology, Graduate School of Agricultural Science, Tohoku University, Miyagi,
Japan
| | - Jahidul ISLAM
- International Education and Research Center for Food and Agricultural Immunology, Graduate School of Agricultural Science, Tohoku University, Miyagi,
Japan
| | - Mutsumi FURUKAWA
- International Education and Research Center for Food and Agricultural Immunology, Graduate School of Agricultural Science, Tohoku University, Miyagi,
Japan
| | - Tomonori NOCHI
- International Education and Research Center for Food and Agricultural Immunology, Graduate School of Agricultural Science, Tohoku University, Miyagi,
Japan
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Ojal J, Goldblatt D, Tigoi C, Scott JAG. Effect of Maternally Derived Anti-protein and Anticapsular IgG Antibodies on the Rate of Acquisition of Nasopharyngeal Carriage of Pneumococcus in Newborns. Clin Infect Dis 2019; 66:121-130. [PMID: 29020230 PMCID: PMC5850545 DOI: 10.1093/cid/cix742] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2017] [Accepted: 08/11/2017] [Indexed: 12/23/2022] Open
Abstract
Background In developing countries, introduction of pneumococcal conjugate vaccine has not eliminated circulation of vaccine serotypes. Vaccinating pregnant mothers to increase antibody concentrations in their newborn infants may reduce the acquisition of pneumococcal carriage and subsequent risk of disease. We explored the efficacy of passive immunity, attributable to anti-protein and anticapsular pneumococcal antibodies, against acquisition of carriage. Methods We examined the rate of nasopharyngeal acquisition of pneumococci in the first 90 days of life associated with varying anticapsular and anti-protein antibody concentrations in infant cord/maternal venous blood in Kilifi, Kenya. We used multivariable Cox proportional hazard models to estimate continuous functions relating acquisition of nasopharyngeal carriage to the concentration of maternally derived antibody. Results Cord blood or maternal venous samples were collected from 976 mother-infant pairs. Pneumococci were acquired 561 times during 33,905 person-days of follow-up. Increasing concentrations of anti-protein antibodies were associated with either a reduction (PhtD1, PspAFam2, Spr0096, StkP) or, paradoxically, an increase (CbpA, LytC, PcpA, PiaA, PspAFam1, RrgBT4) in acquisition rate. We observed a nonsignificant reduction in the incidence of homologous carriage acquisition with high concentrations of maternally derived anticapsular antibodies to 5 serotypes (6A, 6B, 14, 19F, and 23F). Conclusion The protective efficacy of several anti-protein antibodies supports the strategy of maternal vaccination to protect young infants from carriage and invasive disease. We were not able to demonstrate that passive anticapsular antibodies were protective against carriage acquisition at naturally occurring concentrations though it remains possible they may do so at the higher concentrations elicited by vaccination.
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Affiliation(s)
- John Ojal
- KEMRI-Wellcome Trust Research Programme, Centre for Geographic Medicine-Coast, Kilifi, Kenya.,Department of Infectious Disease Epidemiology, Faculty of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - David Goldblatt
- Great Ormond Street Institute of Child Health, University College, London, United Kingdom
| | - Caroline Tigoi
- KEMRI-Wellcome Trust Research Programme, Centre for Geographic Medicine-Coast, Kilifi, Kenya
| | - J Anthony G Scott
- KEMRI-Wellcome Trust Research Programme, Centre for Geographic Medicine-Coast, Kilifi, Kenya.,Department of Infectious Disease Epidemiology, Faculty of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, United Kingdom
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Lars K. Breast-feeding and protection against infection. SCANDINAVIAN JOURNAL OF FOOD & NUTRITION 2016. [DOI: 10.1080/11026480600601083] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- K. Lars
- Department of Clinical Immunology, Go¨teborg University, Go¨teborg, Sweden
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Labout JAM, Duijts L, Arends LR, Jaddoe VWV, Hofman A, de Groot R, Verbrugh HA, Hermans PWM, Moll HA. Factors associated with pneumococcal carriage in healthy Dutch infants: the generation R study. J Pediatr 2008; 153:771-6. [PMID: 18621390 DOI: 10.1016/j.jpeds.2008.05.061] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/26/2007] [Revised: 04/07/2008] [Accepted: 05/30/2008] [Indexed: 10/21/2022]
Abstract
OBJECTIVE To study the prevalence, risk factors, and dynamics of pneumococcal carriage in infancy. STUDY DESIGN In a population-based prospective cohort study conducted in Rotterdam, the Netherlands between June 2003 and November 2006, nasopharyngeal swabs were obtained from children at age of 1.5, 6, and 14 months. Data on risk factors were obtained from midwives, hospital registries, and questionnaires. RESULTS The prevalence of pneumococcal carriage increased from 8.3% at age 1.5 months (n = 627) to 31.3% at age 6 months (n = 832) and 44.5% at age 14 months (n = 757). The prevalence of serotypes covered by the 7-valent conjugate increased from 3.0% to 16.2% and 27.7% at these respective ages. Having siblings (adjusted odds ratio [aOR] = 4.33; 95% confidence interval [CI] = 1.22 to 15.35) and day care attendance (aOR = 3.05, 95% CI = 1.88 to 4.95 at 6 months; aOR = 2.78, 95% CI 1.= 70 to 4.55 at 14 months) were associated with pneumococcal carriage. Pneumococcal carriage at age 6 months was associated with pneumococcal carriage at age 14 months (aOR = 2.43; 95% CI = 1.50 to 3.94). Pneumococcal carriage was not associated with sex, maternal smoking, maternal educational level, or breast-feeding. CONCLUSIONS The prevalence of serotypes covered by the 7-valent conjugate vaccine increased in the first year of life. Siblings, day care attendance, and previous pneumococcal carriage were independent factors associated with pneumococcal carriage.
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Affiliation(s)
- Joost A M Labout
- Generation R Study Group, Erasmus Medical Center, Rotterdam, The Netherlands; department of Pediatrics, Erasmus Medical Center-Sophia Children's Hospital, Rotterdam, The Netherlands
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6
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Hanson LÅ, Korotkova M, Telemo E. Human Milk: Its Components and Their Immunobiologic Functions. Mucosal Immunol 2005. [DOI: 10.1016/b978-012491543-5/50108-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Daly KA, Casselbrant ML, Hoffman HJ, Ingvarsson LB, Kvaerner KJ, Tos M, van Cauwenberge PB. Recent advances in otitis media. 2. Epidemiology, natural history, and risk factors. Ann Otol Rhinol Laryngol 2002; 188:19-25. [PMID: 11968858 DOI: 10.1177/00034894021110s305] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Wold AE, Adlerberth I. Breast feeding and the intestinal microflora of the infant--implications for protection against infectious diseases. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2001; 478:77-93. [PMID: 11065062 DOI: 10.1007/0-306-46830-1_7] [Citation(s) in RCA: 101] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
Human breast milk contains an array of factors with anti-infectious potential, such as immunoglobulins (especially secretory IgA), oligosaccharides and glycoproteins with anti-adhesive capacity, and cytokines. Breast-feeding is associated with protection from the following infections or infection-related conditions: gastroenteritis, upper and lower respiratory tract infection, acute otitis media, urinary tract infection, neonatal septicaemia and necrotizing enterocolitis. Some of the protective effects may derive from an altered mucosal colonization pattern in the breast-fed infant. In other instances breast-fed infants develop less symptoms to the same microbe which causes disease in the bottle-fed infant. An example of an altered colonization pattern is that breast-fed infants have less P-fimbriated, but more type 1-fimbriated E. coli. This may protect against urinary tract infection in the breast-fed infant since P. fimbriae are the major virulence factor for urinary tract infection. An example of changed consequences of the same microbial colonization is that secretory IgA in the breast-milk protects very efficiently from translocation of intestinal bacteria across the gut mucosa by coating intestinal bacteria and blocking their interaction with the epithelium. This mechanism may protect the infant from septicaemia of gut origin and, possibly, necrotizing enterocolitis. Breast-milk is also highly anti-inflammatogenic and contains hormone like factors which counteract diarrhea. Thus, breast-fed infants may be colonized by recognized diarrheal pathogens and still remain healthy. Due to a less virulent intestinal microflora and decreased translocation breast-fed infants will obtain less stimuli for the gut immune system, resulting, in e.g., lower salivary IgA antibody titres.
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Affiliation(s)
- A E Wold
- Department of Clinical Immunology, Göteborg University, Sweden
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Ciftçi E, Doğru U, Aysev D, Ince E, Güriz H, Aysev UD. Investigation of risk factors for penicillin-resistant Streptococcus pneumoniae carriage in Turkish children. Pediatr Int 2001; 43:385-90. [PMID: 11472584 DOI: 10.1046/j.1442-200x.2001.01422.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND Nasopharyngeal colonization plays an important role for infections caused by Streptococcus pneumoniae. Emergence of penicillin resistance in this organism has made it difficult to treat pneumococcal infections. The objectives of this study were to investigate the risk factors for nasopharyngeal colonization with S. pneumonia and for nasopharyngeal colonization with penicillin-resistant S. pneumoniae. METHODS Three hundred children with or without evidence of infection were investigated for various risk factors. Streptococcus pneumoniae isolated from children's nasopharyngeal swabs were examined for penicillin susceptibility. RESULTS Day-care attendance (odds ratio OR=2.82, P=0.003) and upper respiratory tract infection within the last month (OR=1.83, P=0.02), have been determined to be risk factors for S. pneumoniae carriage. The use of antibiotics within the last 3 months (OR=81.07, P<0.001), the presence of more than five people living in the house of the child (OR=6.63, P=0.03), and having a sibling under 5-years-old (OR=4.60, P=0.03) have been determined to be risk factors for penicillin-resistant S. pneumoniae carriage. CONCLUSION Some children are inevitably exposed to and colonized with penicillin susceptible or resistant S. pneumoniae. Changes in day-care organizations, better living conditions, and restriction of antibiotic use seems to be useful precautions to prevent the emerging and colonization with penicillin-susceptible or -resistant S. pneumoniae.
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Affiliation(s)
- E Ciftçi
- Ankara University Medical School, Department of Paediatrics, Ankara, Turkey.
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Tong HH, Fisher LM, Kosunick GM, DeMaria TF. Effect of adenovirus type 1 and influenza A virus on Streptococcus pneumoniae nasopharyngeal colonization and otitis media in the chinchilla. Ann Otol Rhinol Laryngol 2000; 109:1021-7. [PMID: 11089992 DOI: 10.1177/000348940010901106] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Considerable evidence has implicated respiratory tract virus potentiation of bacterial adherence, colonization, and superinfection as a significant factor contributing to the pathogenesis of otitis media (OM). Influenza A and B viruses, adenovirus, and respiratory syncytial virus are the primary respiratory tract viruses associated with this disease. Investigations have established a dramatic increase in the development of experimental OM in chinchillas co-inoculated with influenza A virus and Streptococcus pneumoniae (Spn). The mechanism underlying this phenomenon was suggested to involve, in part, viral compromise of eustachian tube mucosal integrity and function. This study was designed to assess and compare the effect of adenovirus and influenza A virus infection on adherence, the kinetics of colonization, and invasion of the middle ear by Spn in the chinchilla model of OM. Cohorts were inoculated intranasally with adenovirus type 1 or influenza A virus, and then inoculated intranasally 7 days later with Spn 6A. All cohorts were observed over a 14-day period after challenge with Spn, and the incidence and severity of OM were assessed by several methods, including culture of the nasopharynx and middle ear effusions. The data indicated that influenza A virus promotes a significant increase in nasopharyngeal colonization by Spn, an increased incidence and severity of OM, and a sustained presence of Spn in the effusions. Adenovirus infection, however, did not enhance colonization by Spn or result in an increased incidence or severity of OM.
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Affiliation(s)
- H H Tong
- Department of Otolaryngology, College of Medicine and Public Health, The Ohio State University, Columbus 43210-1282, USA
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Håkansson A, Svensson M, Mossberg AK, Sabharwal H, Linse S, Lazou I, Lönnerdal B, Svanborg C. A folding variant of alpha-lactalbumin with bactericidal activity against Streptococcus pneumoniae. Mol Microbiol 2000; 35:589-600. [PMID: 10672181 DOI: 10.1046/j.1365-2958.2000.01728.x] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
This study describes an alpha-lactalbumin folding variant from human milk with bactericidal activity against antibiotic-resistant and -susceptible strains of Streptococcus pneumoniae. The active complex precipitated with the casein fraction at pH 4.6 and was purified from casein by a combination of anion exchange and gel chromatography. Unlike other casein components, the active complex was retained on the ion-exchange matrix and eluted only with high salt. The eluted fraction showed N-terminal and mass spectrometric identity with human milk alpha-lactalbumin, but native alpha-lactalbumin had no bactericidal effect. Spectroscopic analysis demonstrated that the active form of the molecule was in a different folding state, with secondary structure identical to alpha-lactalbumin from human milk whey, but fluctuating tertiary structure. Native alpha-lactalbumin could be converted to the active bactericidal form by ion-exchange chromatography in the presence of a cofactor from human milk casein, characterized as a C18:1 fatty acid. Analysis of the antibacterial spectrum showed selectivity for streptococci; Gram-negative and other Gram-positive bacteria were resistant. The folding variant of alpha-lactalbumin is a new example of naturally occurring molecules with antimicrobial activity.
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Affiliation(s)
- A Håkansson
- Department of Microbiology, Immunology and Glycobiology, Institute of Laboratory Medicine, Lund University, Sölvegatan 23, SE-223 62 Lund, Sweden
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Lysenko E, Richards JC, Cox AD, Stewart A, Martin A, Kapoor M, Weiser JN. The position of phosphorylcholine on the lipopolysaccharide of Haemophilus influenzae affects binding and sensitivity to C-reactive protein-mediated killing. Mol Microbiol 2000; 35:234-45. [PMID: 10632893 DOI: 10.1046/j.1365-2958.2000.01707.x] [Citation(s) in RCA: 117] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The lic1 locus of Haemophilus influenzae controls the incorporation of environmental choline into lipopolysaccharide (LPS) as phosphorylcholine (ChoP) as well as the phase variation of this structure. ChoP is the target of an acute phase reactant in serum, C-reactive protein (CRP), which mediates killing through the activation of complement when bound to the organism. Structural analysis of the oligosaccharide region of the H. influenzae LPS showed that ChoP is linked to different hexose residues on different chain extensions in strains Rd and Eagan. Differences in the molecular environment of ChoP affect the epitope defined by monoclonal antibody 12D9 and were associated with polymorphisms within LicD, a putative diphosphonucleoside choline transferase. Exchanging the licD genes between the two strains with ChoP on different chain extensions was sufficient to switch its position. Allelic variants with ChoP on a hexose on heptose III rather than heptose I were sensitive to CRP-mediated serum bactericidal activity regardless of the genetic background. Differences in CRP-mediated killing correlated with differences in the binding of CRP from human serum to whole bacteria. This suggests that, in addition to the mechanism involving phase variation, the structural rearrangements within the oligosaccharide contribute to evasion of innate and acquired immunity.
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Affiliation(s)
- E Lysenko
- 301B Johnson Pavilion, Department of Microbiology, University of Pennsylvania, Philadelphia, PA 19104-6076, USA
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Affiliation(s)
- F Ghaffar
- Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, USA
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14
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Principi N, Marchisio P, Schito GC, Mannelli S. Risk factors for carriage of respiratory pathogens in the nasopharynx of healthy children. Ascanius Project Collaborative Group. Pediatr Infect Dis J 1999; 18:517-23. [PMID: 10391181 DOI: 10.1097/00006454-199906000-00008] [Citation(s) in RCA: 147] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVES To assess risk factors for nasopharyngeal carriage of Streptococcus pneumoniae, Haemophilus influenzae and Moraxella catarrhalis in a large sample of healthy children. METHODS In this point prevalence survey nasopharyngeal specimens were obtained from 1723 healthy children, ages 1 to 7 years, attending day-care centers or schools in 18 Italian cities. Written questionnaires for obtaining information about the demographics and medical history of the children were completed by the parents in the presence of a pediatrician. RESULTS The overall carrier rate of respiratory pathogens was 17.9% (S. pneumoniae, 3.5%; H. influenzae, 11.9%; M. catarrhalis, 4.1%). Only 5% of S. pneumoniae strains were penicillin-resistant whereas approximately 40% were erythromycin-resistant. Beta-lactamase production was found in 5.8% of H. influenzae and 88.7% of M. catarrhalis isolates. By multivariate analysis age (< or = 3 years), having older siblings, a history of prolonged full-time day-care attendance and living in a rural area significantly influenced the odds of carrying nasopharyngeal respiratory pathogens, particularly in children ages 1 to 5 years. Sex, breastfeeding, passive smoking and recent upper respiratory tract infections were not significant variables. Antibiotic treatment in the previous 3 months did not affect nasopharyngeal carriage, whereas repeated treatments with a macrolide were associated with carriage of S. pneumoniae. CONCLUSIONS Our results suggest that there is a strong and long term relationship between exposure to large numbers of children in the first years of life and nasopharyngeal carriage of all respiratory pathogens. In addition antimicrobial restrictive guidelines should be tailored to local microbiologic sceneries.
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Affiliation(s)
- N Principi
- Pediatric Department 4, University of Milan Medical School, Italy.
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Sørensen CH, Brygge K. Mucosal Immunity and Bacteriology of the Eustachian Tube. EAR, NOSE & THROAT JOURNAL 1998. [DOI: 10.1177/014556139807700912] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The pathogenesis of otitis media is a multifaceted process that is not completely understood. Eustachian tube dysfunction plays a central but uncertain role, as do viral and bacterial microorganisms. Of the latter, the three most important are Streptococcus pneumoniae, Haemophilus influenzae and Moraxella catarrhalis. This article reviews the various mechanisms of infection and the immune system's response to them.
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Affiliation(s)
- Christian Hjort Sørensen
- Department of Otolaryngology—Head & Neck Surgery, University of Copenhagen, Rigshospitalet, Copenhagen, Denmark
| | - Kirsten Brygge
- Department of Otolaryngology—Head & Neck Surgery, University of Copenhagen, Rigshospitalet, Copenhagen, Denmark
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Barthelson R, Mobasseri A, Zopf D, Simon P. Adherence of Streptococcus pneumoniae to respiratory epithelial cells is inhibited by sialylated oligosaccharides. Infect Immun 1998; 66:1439-44. [PMID: 9529065 PMCID: PMC108072 DOI: 10.1128/iai.66.4.1439-1444.1998] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
To study carbohydrate-mediated adherence of Streptococcus pneumoniae to the human airway, we measured binding of live S. pneumoniae organisms to a cultured cell line derived from the lining of the conjunctiva and to primary monolayers of human bronchial epithelial cells in the presence and absence of oligosaccharide inhibitors. Both encapsulated and nonencapsulated strains of S. pneumoniae grown to mid-logarithmic phase in suspension culture adhered to cultured primary respiratory epithelial cells and the conjunctival cell line. Adherence of nine clinically prevalent S. pneumoniae capsular types studied was inhibited preferentially by sialylated oligosaccharides that terminate with the disaccharide NeuAc alpha2-3(or 6)Galbeta1. Adherence of some strains also was weakly inhibited by oligosaccharides that terminate with lactosamine (Galbeta1-4GlcNAcbeta1). When sialylated oligosaccharides were covalently coupled to human serum albumin at a density of approximately 20 oligosaccharides per molecule of protein, the molar inhibitory potency of the oligosaccharide inhibitor was enhanced 500-fold. The above-mentioned experiments reveal a previously unreported dependence upon sialylated carbohydrate ligands for adherence of S. pneumoniae to human upper airway epithelial cells. Enhanced inhibitory potencies of polyvalent over monovalent forms of oligosaccharide inhibitors of adherence suggest that the putative adhesin(s) that recognizes the structure NeuAc alpha2-3(or 6)Galbeta1 is arranged on the bacterial surface in such a manner that it may be cross-linked by oligosaccharides covalently linked to human serum albumin.
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Affiliation(s)
- R Barthelson
- Neose Technologies, Inc., Horsham, Pennsylvania 19044, USA.
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