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Costa ACBP, Pereira CA, Junqueira JC, Jorge AOC. Recent mouse and rat methods for the study of experimental oral candidiasis. Virulence 2013; 4:391-9. [PMID: 23715031 PMCID: PMC3714131 DOI: 10.4161/viru.25199] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
The Candida genus expresses virulence factors that, when combined with immunosuppression and other risk factors, can cause different manifestations of oral candidiasis. The treatment of mucosal infections caused by Candida and the elucidation of the disease process have proven challenging. Therefore, the study of experimentally induced oral candidiasis in rats and mice is useful to clarify the etiopathology of this condition, improve diagnosis, and search for new therapeutic options because the disease process in these animals is similar to that of human candidiasis lesions. Here, we describe and discuss new studies involving rat and mouse models of oral candidiasis with respect to methods for inducing experimental infection, methods for evaluating the development of experimental candidiasis, and new treatment strategies for oral candidiasis.
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Affiliation(s)
- Anna C B P Costa
- Department of Microbial Pathogenicity Mechanisms; Hans-Knoell-Institute; Jena, Germany
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Costa ACBP, Campos Rasteiro VM, da Silva Hashimoto ESH, Araújo CF, Pereira CA, Junqueira JC, Jorge AOC. Effect of erythrosine- and LED-mediated photodynamic therapy on buccal candidiasis infection of immunosuppressed mice and Candida albicans adherence to buccal epithelial cells. Oral Surg Oral Med Oral Pathol Oral Radiol 2012; 114:67-74. [PMID: 22727094 DOI: 10.1016/j.oooo.2012.02.002] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2011] [Revised: 01/24/2012] [Accepted: 02/04/2012] [Indexed: 01/08/2023]
Abstract
OBJECTIVE This study evaluated the effects of photodynamic therapy (PDT) on buccal candidiasis in mice and on the adherence of yeast to buccal epithelial cells (BECs) in vitro. STUDY DESIGN A total of 56 immunosuppressed mice with buccal candidiasis were subjected to PDT, consisting of treatment with erythrosine (400 μmol/L) followed by exposure to a green LED (14.34 J cm(-2)). After treatment, the yeasts recovered from the mice were quantified (CFU/mL) and analyzed for the effects of PDT on their adherence to BECs. The data were analyzed using ANOVA, the Tukey test, Kruskal-Wallis test and Student t test. RESULTS PDT significantly reduced the amount of yeast present in the lesions by 0.73 log(10) (P = .018) and reduced C. albicans adherence to BECs by 35% without damaging adjacent tissues (P = .045). CONCLUSIONS Photodynamic therapy exhibited antifungal effects against C. albicans biofilms formed in vivo and reduced the capacity of C. albicans to adhere to BECs in vitro.
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Affiliation(s)
- Anna Carolina Borges Pereira Costa
- Department of Biosciences and Oral Diagnosis, School of Dentistry of São José dos Campos, UNESP- Univ Estadual Paulista, São José dos Campos, SP, Brazil.
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Junqueira JC. Models hosts for the study of oral candidiasis. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2012; 710:95-105. [PMID: 22127889 DOI: 10.1007/978-1-4419-5638-5_10] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Oral candidiasis is an opportunistic infection caused by yeast of the Candida genus, primarily Candida albicans. It is generally associated with predisposing factors such as the use of immunosuppressive agents, antibiotics, prostheses, and xerostomia. The development of research in animal models is extremely important for understanding the nature of the fungal pathogenicity, host interactions, and treatment of oral mucosal Candida infections. Many oral candidiasis models in rats and mice have been developed with antibiotic administration, induction of xerostomia, treatment with immunosuppressive agents, or the use of germ-free animals, and all these models has both benefits and limitations. Over the past decade, invertebrate model hosts, including Galleria mellonella, Caenorhabditis elegans, and Drosophila melanogaster, have been used for the study of Candida pathogenesis. These invertebrate systems offer a number of advantages over mammalian vertebrate models, predominantly because they allow the study of strain collections without the ethical considerations associated with studies in mammals. Thus, the invertebrate models may be useful to understanding of pathogenicity of Candida isolates from the oral cavity, interactions of oral microorganisms, and study of new antifungal compounds for oral candidiasis.
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Affiliation(s)
- Juliana Campos Junqueira
- Department of Biosciences and Oral Diagnosis, School of Dentistry of São José dos Campos, UNESP-Univ Estadual Paulista, São Paulo, Brazil.
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Abstract
Saliva plays an important protective role in the oral environment, and reductions in saliva quantity are known to increase the risk of oral diseases. Importantly, xerostomia or the perception of a dry mouth is now being recognized as an important risk factor for dental diseases. Furthermore, the subjective sensation of a dry mouth is a debilitating condition in itself that impacts on the quality of life of sufferers. With approximately 1 in 5 people reporting some form of dry mouth, and an increasing prevalence in the elderly, it is important for clinicians to have a thorough understanding of this problem. The aim of this paper is to review some of the literature relating to xerostomia in order to provide an evidence based update for clinicians.
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Affiliation(s)
- M S Hopcraft
- Cooperative Research Centre for Oral Health Sciences, Melbourne Dental School, The University of Melbourne, Victoria.
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Martins JDS, Junqueira JC, Faria RL, Santiago NF, Rossoni RD, Colombo CED, Jorge AOC. Antimicrobial photodynamic therapy in rat experimental candidiasis: evaluation of pathogenicity factors of Candida albicans. ACTA ACUST UNITED AC 2011; 111:71-7. [DOI: 10.1016/j.tripleo.2010.08.012] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2010] [Revised: 07/28/2010] [Accepted: 08/05/2010] [Indexed: 10/18/2022]
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Kothavade RJ, Kura MM, Valand AG, Panthaki MH. Candida tropicalis: its prevalence, pathogenicity and increasing resistance to fluconazole. J Med Microbiol 2010; 59:873-880. [PMID: 20413622 DOI: 10.1099/jmm.0.013227-0] [Citation(s) in RCA: 189] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Candida tropicalis has been identified as the most prevalent pathogenic yeast species of the Candida-non-albicans group. Historically, Candida albicans has been the major species responsible for causing candidiasis in immunocompromised and immunocompetent patients. However, infections (candidiasis) due to C. tropicalis have increased dramatically on a global scale thus proclaiming this organism to be an emerging pathogenic yeast. The reasons for this organism's dominance and its resistance to fluconazole have been difficult to elucidate. In addition, the mechanism of this organism's pathogenicity and the consequent immune response remain to be clarified. This paper describes certain predisposing factors potentially responsible for these characteristics and presents a 'root cause analysis' to explain the increasing prevalence of C. tropicalis in developed and undeveloped countries, as well as the organism's acquired drug resistance. Control measures against fluconazole resistance in clinical management have also been discussed.
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Affiliation(s)
- Rajendra J Kothavade
- Microbiology Section, WQA Laboratory, EPCOR, 9469 Rossdale Rd NW, Edmonton, AB T5K 0S5, Canada
| | - M M Kura
- Department of Dermatology, Grant Medical College and Sir J. J. Group of Hospitals, Mumbai 400 008, India
| | - Arvind G Valand
- Department of Pathology, Grant Medical College and Sir J. J. Group of Hospitals, Mumbai 400 008, India
| | - M H Panthaki
- Department of Immunocytobiology and Pathology, Sir H. N. Hospital and Medical Research Centre, Mumbai 400 004, India
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7
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Photodynamic therapy for the treatment of buccal candidiasis in rats. Lasers Med Sci 2009; 24:877-84. [PMID: 19408038 DOI: 10.1007/s10103-009-0673-4] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2008] [Accepted: 04/05/2009] [Indexed: 10/20/2022]
Abstract
The study objective was to evaluate the effects of photodynamic therapy on buccal candidiasis in rats. After experimental candidiasis had been induced on the tongue dorsum, 72 rats were distributed into four groups according to treatment: treated with laser and methylene blue photosensitizer (L+P+); treated only with laser (L+P-); treated only with photosensitizer (L--P+); not treated with laser or photosensitizer (L-P-). The rats were killed immediately, 1 day, or 5 days after treatment, for microscopic analysis of the tongue dorsum. Observation verified that the photodynamic therapy group (L+P+) exhibited fewer epithelial alterations and a lower chronic inflammatory response than the L-P- group. The group L+P- presented more intense epithelial alterations and chronic inflammatory response than the remaining groups. The L-P+ group showed tissue lesions similar to those of the L-P- group. In conclusion, rats treated with photodynamic therapy developed more discrete candidiasis lesions than did the remaining groups.
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Abstract
Oral candidiasis is an opportunistic infection caused primarily by Candida albicans. However, in recent years, species of non-albicans Candida have been implicated more frequently in mucosal infection. Candida species usually reside as commensal organisms and are part of normal oral microflora. Determining exactly how transformation from commensal to pathogen takes place and how it can be prevented is continuous challenge for clinical doctors. Candidal adherence to mucosal surfaces is considered as a critical initial step in the pathogenesis of oral candidiasis. Acrylic dentures, acting as reservoirs, play an important role in increasing the risk from Candida colonisation. Thus, this review discusses what is currently known about the adhesion of non-albicans Candida species of oral origin to buccal epithelial cells and denture acrylics.
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Torres SR, Peixoto CB, Caldas DM, Akiti T, Barreiros MGC, de Uzeda M, Nucci M. A prospective randomized trial to reduce oral Candida spp. colonization in patients with hyposalivation. Braz Oral Res 2007; 21:182-7. [PMID: 17589656 DOI: 10.1590/s1806-83242007000200015] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2006] [Accepted: 12/04/2006] [Indexed: 11/21/2022] Open
Abstract
Low salivary flow rates are associated with higher oral Candida spp. counts, which may predispose to oral candidiasis. The aim of this study was to compare the effect of stimulating salivary flow rates with that of a regimen of chlorhexidine mouth rinse on the intensity of Candida colonization in patients with reduced salivary flow rates. Thirty-one outpatients were randomized to stimulate salivary output (group 1) or to receive chlorhexidine mouth rinses (group 2). Evaluations were performed at baseline (T0), at end of treatment (T1), and 15 days after last day of treatment (T2). Chewing-stimulated whole saliva samples were collected at each visit. Group 1 showed a constant reduction in median cfu counts, although the difference was significant only between T0 and T2 (p = 0.004). Group 2 showed a reduction in median Candida cfu counts between T0 and T1 (p = 0.01), but the counts increased at T2 (p = 0.01), and the difference between T0 and T2 was not significant (p = 0.8). In conclusion, patients who received salivary stimulation showed reductions of Candida cfu counts in saliva and a trend for increasing salivary flow rates between baseline and end of study evaluations. The use of chlorhexidine mouth rinses dramatically reduced Candida cfu counts, but when patients discontinued treatment, intensity of colonization rose again.
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Affiliation(s)
- Sandra Regina Torres
- Department of Oral Pathology and Diagnosis, School of Dentistry, Federal University of Rio de Janeiro.
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Junqueira JC, Colombo CED, Martins JDS, Koga Ito CY, Carvalho YR, Jorge AOC. Experimental candidosis and recovery of Candida albicans from the oral cavity of ovariectomized rats. Microbiol Immunol 2005; 49:199-207. [PMID: 15781993 DOI: 10.1111/j.1348-0421.2005.tb03721.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The aim of this study was to analyze the development of candidosis and the recovery of C. albicans from the oral cavity of ovariectomized and sham-ovariectomized rats. One hundred and twenty-four rats originally negative for Candida spp. in the oral cavity were divided into two groups: ovariectomized and sham-ovariectomized. Fifty-eight ovariectomized and the same quantity of sham-ovariectomized rats were inoculated with C. albicans for the study of candidosis development and recovery of yeast. Four animals from each group were not inoculated with yeast suspension and were submitted to tongue dorsum morphologic analysis by optical and scanning electron microscopy. The development of candidosis in the tongue dorsum was observed by optical and scanning electron microscopy in the periods of 6 hr, 24 hr, 7 days and 15 days after the last inoculation. Recovery of C. albicans was performed by oral samples plating on Sabouraud agar after 1, 2, 5 and 7 days and progressively at each 15-day interval until negative cultures for yeasts were obtained. The results were analyzed by Mann-Whitney and Student's t tests. The tongue dorsum of sham-ovariectomized and ovariectomized rats, not infected by Candida, presented normal aspect. Among the infected rats, the ovariectomized group showed less occurrence of candidosis lesions and lower recovery of C. albicans from the oral cavity in relation to the sham-ovariectomized group. It could be concluded that candidosis was less frequent from the oral cavities of ovariectomized rats in relation to sham-ovariectomized.
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Affiliation(s)
- Juliana Campos Junqueira
- Department of Biosciences and Oral Diagnosis, School of Dentistry of São José dos Campos, São Paulo State University, SP, Brazil.
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Núñez MJ, Balboa J, Riveiro P, Liñares D, Mañá P, Rey-Méndez M, Rodríguez-Cobos A, Suárez-Quintanilla JA, García-Vallejo LA, Freire-Garabal M. Effects of psychological stress and alprazolam on development of oral candidiasis in rats. CLINICAL AND DIAGNOSTIC LABORATORY IMMUNOLOGY 2002; 9:852-7. [PMID: 12093685 PMCID: PMC120028 DOI: 10.1128/cdli.9.4.852-857.2002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Psychological stress has been found to suppress cell-mediated immune responses that are important in limiting the proliferation of Candida albicans. Since anxiolytic drugs can restore cellular immunity in rodents exposed to stress conditions, we designed experiments conducted to evaluate the effects of alprazolam (1 mg/kg of body weight/day), a central benzodiazepine anxiolytic agonist, on the development of oral candidiasis in Sprague-Dawley rats exposed to a chronic auditory stressor. Animals were submitted to surgical hyposalivation in order to facilitate the establishment and persistence of C. albicans infection. Application of stress and treatment with drugs (placebo or alprazolam) were initiated 7 days before C. albicans inoculation and lasted until the end of the experiments (day 15 postinoculation). Establishment of C. albicans infection was evaluated by swabbing the inoculated oral cavity with a sterile cotton applicator on days 2 and 15 after inoculation, followed by plating on YEPD (yeast extract-peptone-dextrose) agar. Tissue injury was determined by the quantification of the number and type (normal or abnormal) of papillae on the dorsal tongue per microscopic field. A semiquantitative scale was devised to assess the degree of colonization of the epithelium by fungal hyphae. Our results show that stress exacerbates C. albicans infection of the tongues of rats. Significant increases in Candida counts, the percentage of the tongue's surface covered with clinical lesions, the percentage of abnormal papillae, and the colonization of the epithelium by fungal hyphae were found in stressed rats compared to those found in the unstressed rats. Treatment with alprazolam significantly reversed these adverse effects of stress, showing that, besides the psychopharmacological properties of this anxiolytic drug against stress, it has consequences for Candida infection.
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Affiliation(s)
- M J Núñez
- Neuroimmunology Laboratory, Department of Pharmacology, School of Medicine, University of Santiago de Compostela, 15705-Santiago de Compostela, Spain
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12
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Torres SR, Peixoto CB, Caldas DM, Silva EB, Akiti T, Nucci M, de Uzeda M. Relationship between salivary flow rates and Candida counts in subjects with xerostomia. ORAL SURGERY, ORAL MEDICINE, ORAL PATHOLOGY, ORAL RADIOLOGY, AND ENDODONTICS 2002; 93:149-54. [PMID: 11862202 DOI: 10.1067/moe.2002.119738] [Citation(s) in RCA: 130] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
OBJECTIVE This study evaluated the relationship between salivary flow and Candida colony counts in the saliva of patients with xerostomia. STUDY DESIGN Sialometry and Candida colony-forming unit (CFU) counts were taken from 112 subjects who reported xerostomia in a questionnaire. Chewing-stimulated whole saliva was collected and streaked in Candida plates and counted in 72 hours. Species identification was accomplished under standard methods. RESULTS There was a significant inverse relationship between salivary flow and Candida CFU counts (P =.007) when subjects with high colony counts were analyzed (cutoff point of 400 or greater CFU/mL). In addition, the median sialometry of men was significantly greater than that of women (P =.003), even after controlling for confounding variables like underlying disease and medications. Sjögren's syndrome was associated with low salivary flow rate (P =.007). There was no relationship between the median Candida CFU counts and gender or age. There was a high frequency (28%) of mixed colonization. Candida albicans was the most frequent species, followed by C parapsilosis, C tropicalis, and C krusei. CONCLUSIONS In subjects with high Candida CFU counts there was an inverse relationship between salivary flow and Candida CFU counts.
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Affiliation(s)
- Sandra R Torres
- Depatment of Oral Pathology and oral Diagnostic, School of Dentistry, Universidade Federal do Rio de Janeiro, Brazil.
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Abstract
Oral candidiasis is as much the final outcome of the vulnerability of the host as of the virulence of the invading organism. We review here the extensive literature on animal experiments mainly appertaining to the host predisposing factors that initiate and perpetuate these infections. The monkey, rat, and mouse are the choice models for investigating oral candidiasis, but comparisons between the same or different models appear difficult, because of variables such as the study design, the number of animals used, their diet, the differences in Candida strains, and the duration of the studies. These variables notwithstanding, the following could be concluded. (i) The primate model is ideal for investigating Candida-associated denture stomatitis since both erythematous and pseudomembranous lesions have been produced in monkeys with prosthetic plates; they are, however, expensive and difficult to obtain and maintain. (ii) The rat model (both Sprague-Dawley and Wistar) is well proven for observing chronic oral candidal colonization and infection, due to the ease of breeding and handling and their ready availability. (iii) Mice are similar, but in addition there are well characterized variants simulating immunologic and genetic abnormalities (e.g., athymic, euthymic, murine-acquired immune deficiency syndrome, and severe combined immunodeficient models) and hence are used for short-term studies relating the host immune response and oral candidiasis. Nonetheless, an ideal, relatively inexpensive model representative of the human oral environment in ecological and microbiological terms is yet to be described. Until such a model is developed, researchers should pay attention to standardization of the experimental protocols described here to obtain broadly comparable and meaningful data.
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Affiliation(s)
- Y H Samaranayake
- Oral Biosciences, Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, China
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Freire-Garabal M, Núñez MJ, Balboa J, Rodríguez-Cobo A, López-Paz JM, Rey-Méndez M, Suárez-Quintanilla JA, Millán JC, Mayán JM. Effects of amphetamine on development of oral candidiasis in rats. CLINICAL AND DIAGNOSTIC LABORATORY IMMUNOLOGY 1999; 6:530-3. [PMID: 10391856 PMCID: PMC95721 DOI: 10.1128/cdli.6.4.530-533.1999] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Experiments were conducted to evaluate the effects of amphetamine (0. 4 mg/kg of body weight/day) on the development of oral candidiasis in Sprague-Dawley rats. Animals were submitted to surgical hyposalivation in order to facilitate the establishment and persistence of Candida albicans infection. Treatment with drugs (placebo or amphetamine) was initiated 7 days before C. albicans inoculation and lasted until the end of the experiments, day 15 postinoculation. Establishment of C. albicans infection was evaluated by swabbing the inoculated oral cavity with a sterile cotton applicator on days 2 and 15 after inoculation, followed by plating on YEPD (yeast extract-peptone-dextrose) agar. Tissue injury was determined by the quantification of the number and type (normal or abnormal) of papillae on the dorsal tongue per microscopic field. A semiquantitative scale was devised to assess the degree of colonization of the epithelium by fungal hyphae. Our results show that amphetamine exacerbates C. albicans infection of the tongues of rats. Significant increases in Candida counts, the percentage of the tongue's surface covered with clinical lesions, the percentage of abnormal papillae, and the colonization of the epithelium by fungal hyphae were found in amphetamine-treated rats compared to those found in the rats injected with a placebo. The last two parameters increased in rats treated with the placebo compared to the parameters of the untreated control rats.
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Affiliation(s)
- M Freire-Garabal
- Department of Pharmacology, University of Santiago de Compostela, 15705-Santiago de Compostela, Spain.
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Abraham CM, al-Hashimi I, Haghighat N. Evaluation of the levels of oral Candida in patients with Sjögren's syndrome. ORAL SURGERY, ORAL MEDICINE, ORAL PATHOLOGY, ORAL RADIOLOGY, AND ENDODONTICS 1998; 86:65-8. [PMID: 9690247 DOI: 10.1016/s1079-2104(98)90151-2] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
OBJECTIVE The purpose of this study was to investigate the levels of oral Candida in patients with Sjögren's syndrome METHODS The Candida count and salivary flow rate of patients with Sjögren's syndrome were compared with those of healthy control subjects. Candida cultures were obtained from oral rinses. The numbers of colony-forming units were determined through use of the Spiral System. RESULTS The mean Candida count of patients with Sjögren's syndrome was 1672 +/- 1455 colony-forming units per mL; the count of healthy control subjects was 0.00 colony-forming units per mL. The mean salivary flow rate of patients with Sjögren's syndrome was significantly lower than that of healthy control subjects (0.16 +/- 0.13 mL/min/gland vs 0.55 +/- 0.24 mL/min/gland, respectively; p = 0.0001). However, Spearman rank correlation analyses did not reveal a significant correlation between salivary flow rate and Candida count (in colony-forming units per mL) among patients with Sjögren's syndrome. CONCLUSIONS Alteration in the oral microbial flora in patients with Sjögren's syndrome may be enhanced by the reduction in salivary output.
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Affiliation(s)
- C M Abraham
- Baylor College of Dentistry, Dallas, Tex., USA
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JORGE AOC, KOGA-ITO CY, GONÇALVES CR, FANTINATO V, UNTERKIRCHER CS. PRESENÇA DE LEVEDURAS DO GÊNERO CANDIDA NA SALIVA DE PACIENTES COM DIFERENTES FATORES PREDISPONENTES E DE INDIVÍDUOS CONTROLE. ACTA ACUST UNITED AC 1997. [DOI: 10.1590/s0103-06631997000400009] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Os microrganismos do gênero Candida são, em geral, comensais da cavidade bucal, mas, em determinados indivíduos e em situações específicas, podem transformar-se na forma parasitária, produzindo candidoses bucais. O objetivo deste trabalho foi analisar a presença das espécies do gênero Candida na saliva de indivíduos controle, comparando com pacientes que apresentavam diferentes fatores predisponentes. Foram avaliados 493 pacientes, divididos em 7 grupos: prótese total, prótese parcial removível, periodontite crônica de adulto, respiração bucal, aparelho ortodôntico fixo, aparelho ortodôntico removível e aparelho extrabucal. O grupo controle consistiu de 570 indivíduos que não apresentavam nenhum desses fatores, divididos em 2 grupos: infantil e adulto. Foram realizados o isolamento e a identificação das espécies do gênero Candida. Os resultados mostraram maior porcentagem de pacientes positivos para Candida nos grupos com fatores predisponentes em relação aos controles. Houve predominância de isolamento de C. albicans em todos os grupos, porém, os pacientes com fatores predisponentes apresentaram diversidade maior de espécies
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Totti MA, Jorge AO, dos Santos EB, de Almeida OP, Scully C. Implantation of Candida albicans and other Candida species in the oral cavity of rats. J Oral Pathol Med 1996; 25:308-10. [PMID: 8887074 DOI: 10.1111/j.1600-0714.1996.tb00267.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The carriage of five Candida species in the mouths of normal and sialoadenectomised rats was determined for periods up to 30 days after inoculation into the oral cavity. In both test and control animals, Candida albicans was the species recovered in greatest quantities at all periods, followed by C. parapsilosis and C. tropicalis. In contrast, C. guilliermondii and C. krusei were isolatable only in small numbers and only from the 1st up to the 5th day; they were not present thereafter. Sialoadenectomy favoured oral colonisation only by C. albicans (P < 0.05) and did not influence the carriage of the other species.
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Affiliation(s)
- M A Totti
- Department of Oral Pathology, Faculty of Odontology, University of Campinas, Piracicaba-SP, Brazil
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Allen CM. Animal models of oral candidiasis. A review. ORAL SURGERY, ORAL MEDICINE, AND ORAL PATHOLOGY 1994; 78:216-21. [PMID: 7936592 DOI: 10.1016/0030-4220(94)90150-3] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Candida albicans is the most common fungal infection of the human oral mucosa, yet much remains to be understood with respect to the pathogenesis of the disease. Numerous difficulties are inherent in designing studies that use human beings as subjects. The use of various animal species in experimental contexts has helped to provide insight with respect to this condition. A variety of manipulations of the system can be performed, including altering the host immune response, the mucosal environment, or the systemic environment. In addition, organism-related factors can be examined in a more controlled setting. The information obtained from such studies could not be obtained in an in vitro situation.
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Affiliation(s)
- C M Allen
- Section of Oral and Maxillofacial Surgery and Pathology, Ohio State University, College of Dentistry
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