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Vazquez-Munoz R, Thompson A, Sobue T, Dongari-Bagtzoglou A. Powder diet exacerbates oropharyngeal candidiasis in a mouse model. Appl Environ Microbiol 2024; 90:e0171323. [PMID: 38319097 PMCID: PMC10952443 DOI: 10.1128/aem.01713-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Accepted: 01/04/2024] [Indexed: 02/07/2024] Open
Abstract
This study reports on the influence of a powder diet in a mouse model of oropharyngeal candidiasis (OPC), a significant health concern caused primarily by Candida albicans. Despite identical nutritional composition, we found that a powdered diet significantly increased Candida burdens and oral lesions, and aggravated weight loss compared to a standard pelleted diet. High fungal burdens and severe oral lesions were accomplished within 48 hours after infection with only one dose of cortisone. Moreover, mice on a powder diet recovered a week after infection. Using a powder diet, we thus modified the cortisone OPC murine model in a way that simplifies the infection process, enhances reproducibility, and facilitates studies investigating both pathogenesis and recovery processes. Our findings also underscore the pivotal role of the physical form of the diet in the progression and severity of oral Candida infection in this model. Future research should investigate this relationship further to broaden our understanding of the underlying mechanisms, potentially leading to novel prevention strategies and improved disease management.IMPORTANCEOropharyngeal candidiasis (OPC) is a multifactorial disease and a significant health concern. We found that the physical form of the diet plays a critical role in the severity and progression of OPC. We developed a modified cortisone OPC murine model that facilitates studies investigating pathogenesis and recovery processes.
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Affiliation(s)
- Roberto Vazquez-Munoz
- Department of General Dentistry, The University of Connecticut Health Center, Farmington, Connecticut, USA
| | - Angela Thompson
- Department of General Dentistry, The University of Connecticut Health Center, Farmington, Connecticut, USA
| | - Takanori Sobue
- Department of General Dentistry, The University of Connecticut Health Center, Farmington, Connecticut, USA
| | - Anna Dongari-Bagtzoglou
- Department of General Dentistry, The University of Connecticut Health Center, Farmington, Connecticut, USA
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Böswald LF, Kienzle E, Matzek D, Schmitz M, Popper BA. Comparative analysis of pancreatic amylase activity in laboratory rodents. Sci Rep 2023; 13:17299. [PMID: 37828078 PMCID: PMC10570267 DOI: 10.1038/s41598-023-44532-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Accepted: 10/10/2023] [Indexed: 10/14/2023] Open
Abstract
Alpha-amylase is the main enzyme for starch digestion in the mammalian gastrointestinal tract. There are species differences in the enzymatic activity of pancreatic amylase that are related to the digestive strategy and natural diet of a species. This aspect is well investigated in pet and farm animals, while in common laboratory animal rodents, information is scarce. In the context of the 3R concept, detailed knowledge of the digestive physiology should be the basis of adequate nutrition, experimental planning and data interpretation. The present study aimed to obtain reference data on amylase activity in pancreatic tissue and duodenal digesta in laboratory mice, rats and hamsters. In addition, digesta was stained with Lugol's iodine to visualize starch in the process of degradation throughout the gastrointestinal tract. Amylase activity in pancreatic tissue and duodenal digesta was significantly lower in hamsters than rats and mice. The Lugol staining showed intense starch degradation in the hamsters' forestomachs, presumably by microbial fermentation. A possible explanation is that the prae-duodenal microbial starch fermentation enhances digestibility and reduces the need for pancreatic amylase in hamsters. Rats and mice may rely more on pancreatic amylase for prae-caecal starch digestion, while the microbial fermentation is mainly located in the caecum. The results clearly show species differences in the digestive capacity for starch in mice, rats and hamsters that need to be considered in the feeding of these species in the laboratory setting as well as in the use of rodents as translational animal models.
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Affiliation(s)
- Linda F Böswald
- Chair for Animal Nutrition and Dietetics, Department of Veterinary Sciences, Faculty of Veterinary Medicine, Ludwig-Maximilians-Universität München, Munich, Germany.
- Core Facility Animal Models, Biomedical Center, Faculty of Medicine, Ludwig-Maximilians-Universität München, Munich, Germany.
| | - Ellen Kienzle
- Chair for Animal Nutrition and Dietetics, Department of Veterinary Sciences, Faculty of Veterinary Medicine, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Dana Matzek
- Core Facility Animal Models, Biomedical Center, Faculty of Medicine, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Marion Schmitz
- Chair for Animal Nutrition and Dietetics, Department of Veterinary Sciences, Faculty of Veterinary Medicine, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Bastian A Popper
- Core Facility Animal Models, Biomedical Center, Faculty of Medicine, Ludwig-Maximilians-Universität München, Munich, Germany
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Davies S, Nelson DE, Shrestha S, Savage DD. Impact of two different rodent diets on maternal ethanol consumption, serum ethanol concentration and pregnancy outcome measures. Alcohol 2023; 111:39-49. [PMID: 37225109 PMCID: PMC10527634 DOI: 10.1016/j.alcohol.2023.05.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Revised: 04/28/2023] [Accepted: 05/05/2023] [Indexed: 05/26/2023]
Abstract
Recent studies report varying levels of ethanol consumption by rodents maintained on different commercially available laboratory diets. As varied ethanol consumption by dams may impact offspring outcome measures in prenatal ethanol exposure paradigms, we compared ethanol consumption by rats maintained on the Envigo 2920 diet, used in our vivarium, with an isocalorically equivalent PicoLab 5L0D diet used in some alcohol consumption studies. Compared to 5L0D diet, female rats maintained on 2920 diet consumed 14% less ethanol during daily 4-h drinking sessions prior to pregnancy and 28% less ethanol during gestation. Rat dams consuming 5L0D diet gained significantly less weight during pregnancy. However, their pup birth weights were significantly higher. A subsequent study revealed that hourly ethanol consumption was not different between diets during the first 2 h, but was significantly lower on 2920 diet at the end of the third and fourth hours. The mean serum ethanol concentration in 5L0D dams after the first 2 h of drinking was 46 mg/dL compared to 25 mg/dL in 2920 dams. Further, ethanol consumption at the 2-h blood sampling time point was more variable in 2920 dams compared to 5L0D dams. An in vitro analysis mixing each powdered diet with 5% ethanol in acidified saline revealed that a 2920 diet suspension adsorbed more aqueous medium than the 5L0D diet suspension. The total ethanol remaining in aqueous supernatant of 5L0D mixtures was nearly twice the amount of ethanol in supernatants of the 2920 mixtures. These results suggest that the 2920 diet expands to a greater extent in aqueous medium than the 5L0D diet. We speculate that increasing adsorption of water and ethanol by the 2920 diet may reduce or delay the amount of ethanol absorbed and may decrease serum ethanol concentration to a greater extent than would be predicted from the amount of ethanol consumed.
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Affiliation(s)
- Suzy Davies
- Department of Neurosciences, University of New Mexico School of Medicine, Albuquerque, NM, 87131, United States
| | - Danika E Nelson
- Department of Neurosciences, University of New Mexico School of Medicine, Albuquerque, NM, 87131, United States
| | - Sumi Shrestha
- Department of Neurosciences, University of New Mexico School of Medicine, Albuquerque, NM, 87131, United States
| | - Daniel D Savage
- Department of Neurosciences, University of New Mexico School of Medicine, Albuquerque, NM, 87131, United States.
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Böswald LF, Wenderlein J, Siegert W, Straubinger RK, Kienzle E. True mineral digestibility in C57Bl/6J mice. PLoS One 2023; 18:e0290145. [PMID: 37585435 PMCID: PMC10431658 DOI: 10.1371/journal.pone.0290145] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Accepted: 08/02/2023] [Indexed: 08/18/2023] Open
Abstract
Data on mineral digestibility is key to understand mineral homeostasis and refine the recommendations for the dietary intake of these nutrients. In farm animals and pets, there is plenty of data on mineral digestibility and influencing factors. In laboratory mice, however, there is a lack of information on mineral digestibility under maintenance conditions, although this should be the basis for studies on mineral homeostasis under experimental conditions. The aim of the present study was to analyse data on intake, faecal excretion, and apparent digestibility of calcium, phosphorus, sodium, potassium, and magnesium in C57BL/6J mice fed different maintenance diets with varying voluntary dry matter intake. Lucas-tests were used to quantify true digestibility and describe correlations between dietary intake and excretion/absorption of the nutrients. Calcium, phosphorus, and magnesium showed a linear correlation between intake and faecal excretion (R2: 0.77, 0.93 and 0.91, respectively). Intake and apparently digested amounts of sodium and potassium were correlated linearly (R2: 0.86 and 0.98, respectively). These data show that intake is the major determinant of absorption in the minerals listed above. Faecal calcium and phosphorus excretion were correlated as well (R2 = 0.75).
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Affiliation(s)
- Linda F. Böswald
- Chair for Animal Nutrition and Dietetics, Department of Veterinary Sciences, Faculty of Veterinary Medicine, LMU München, München, Germany
| | - Jasmin Wenderlein
- Chair of Bacteriology and Mycology, Institute of Infectious Diseases and Zoonoses, Department of Veterinary Sciences, Faculty of Veterinary Medicine, LMU München, München, Germany
| | - Wolfgang Siegert
- Institute of Animal Science, University of Hohenheim, Stuttgart, Germany
| | - Reinhard K. Straubinger
- Chair of Bacteriology and Mycology, Institute of Infectious Diseases and Zoonoses, Department of Veterinary Sciences, Faculty of Veterinary Medicine, LMU München, München, Germany
| | - Ellen Kienzle
- Chair for Animal Nutrition and Dietetics, Department of Veterinary Sciences, Faculty of Veterinary Medicine, LMU München, München, Germany
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Morphology of Starch Particles along the Passage through the Gastrointestinal Tract in Laboratory Mice Fed Extruded and Pelleted Diets. Animals (Basel) 2022; 12:ani12080952. [PMID: 35454201 PMCID: PMC9032392 DOI: 10.3390/ani12080952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 03/30/2022] [Accepted: 04/02/2022] [Indexed: 01/27/2023] Open
Abstract
Simple Summary Starch is the main carbohydrate source in most lab mouse diets. Its properties are influenced by feed processing. This determines how easily accessible it is to enzymatic digestion in the gastrointestinal tract of animals. In previous studies we have shown that there are differences between pelleted and extruded forms of a maintenance diet fed to mice regarding digestibility and microbiome. To complement these findings, the present study presents a morphological study of the starch particles throughout the passage along the gastrointestinal tract of C57BL/6J mice fed either pellets or extrudate. Samples were stained with Lugol’s iodine and examined via stereomicroscope and scanning electron microscope. Starch granules in the pelleted diet are mostly intact and compact, thus autoenzymatic digestion in the small intestine is less efficient than in the more accessible starch granules from the extruded diet. For both diet forms, starch accumulation in the caecum was observed, suggesting selective retention of praecaecally undigested starch for microbial fermentation. These findings allow for unique insights in murine starch digestion that are important to understand the digestive physiology of this species. Abstract Diet processing impacts on starch properties, such as the degree of starch gelatinization. This affects digestibility, as shown in laboratory mice fed either a pelleted or an extruded diet. In the present study, the morphology of starch particles throughout the digestive tract of mice was visualized. Thirty-two female C57BL/6J mice were used for a feeding trial. They were fed a commercial maintenance diet for laboratory mice, which was available in pelleted and extruded form, for seven weeks. The mice were sacrificed after the feeding period, and chyme samples were collected from five sites (stomach, anterior and posterior small intestine, caecum, colon). Samples of diets, chyme and faeces were analyzed via stereomicroscopy (stained with Lugol’s iodine) and scanning electron microscopy (SEM). The starch granules appeared more compact in the pelleted diet, showing first signs of degradation only in the small intestine. The caecum content of both diets group was intensively stained, particles as well as fluid phase, indicating that it contained mainly starch. The SEM pictures of caecum content showed abundant bacteria near starch particles. This suggests selective retention of prae-caecally undigested starch in the murine caecum, likely the site of microbial fermentation.
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