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Cowan DA, Lebre PH, Amon C, Becker RW, Boga HI, Boulangé A, Chiyaka TL, Coetzee T, de Jager PC, Dikinya O, Eckardt F, Greve M, Harris MA, Hopkins DW, Houngnandan HB, Houngnandan P, Jordaan K, Kaimoyo E, Kambura AK, Kamgan-Nkuekam G, Makhalanyane TP, Maggs-Kölling G, Marais E, Mondlane H, Nghalipo E, Olivier BW, Ortiz M, Pertierra LR, Ramond JB, Seely M, Sithole-Niang I, Valverde A, Varliero G, Vikram S, Wall DH, Zeze A. Biogeographical survey of soil microbiomes across sub-Saharan Africa: structure, drivers, and predicted climate-driven changes. Microbiome 2022; 10:131. [PMID: 35996183 PMCID: PMC9396824 DOI: 10.1186/s40168-022-01297-w] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Accepted: 05/15/2022] [Indexed: 05/20/2023]
Abstract
BACKGROUND Top-soil microbiomes make a vital contribution to the Earth's ecology and harbor an extraordinarily high biodiversity. They are also key players in many ecosystem services, particularly in arid regions of the globe such as the African continent. While several recent studies have documented patterns in global soil microbial ecology, these are largely biased towards widely studied regions and rely on models to interpolate the microbial diversity of other regions where there is low data coverage. This is the case for sub-Saharan Africa, where the number of regional microbial studies is very low in comparison to other continents. RESULTS The aim of this study was to conduct an extensive biogeographical survey of sub-Saharan Africa's top-soil microbiomes, with a specific focus on investigating the environmental drivers of microbial ecology across the region. In this study, we sampled 810 sample sites across 9 sub-Saharan African countries and used taxonomic barcoding to profile the microbial ecology of these regions. Our results showed that the sub-Saharan nations included in the study harbor qualitatively distinguishable soil microbiomes. In addition, using soil chemistry and climatic data extracted from the same sites, we demonstrated that the top-soil microbiome is shaped by a broad range of environmental factors, most notably pH, precipitation, and temperature. Through the use of structural equation modeling, we also developed a model to predict how soil microbial biodiversity in sub-Saharan Africa might be affected by future climate change scenarios. This model predicted that the soil microbial biodiversity of countries such as Kenya will be negatively affected by increased temperatures and decreased precipitation, while the fungal biodiversity of Benin will benefit from the increase in annual precipitation. CONCLUSION This study represents the most extensive biogeographical survey of sub-Saharan top-soil microbiomes to date. Importantly, this study has allowed us to identify countries in sub-Saharan Africa that might be particularly vulnerable to losses in soil microbial ecology and productivity due to climate change. Considering the reliance of many economies in the region on rain-fed agriculture, this study provides crucial information to support conservation efforts in the countries that will be most heavily impacted by climate change. Video Abstract.
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Affiliation(s)
- D A Cowan
- Centre for Microbial Ecology and Genomics, Department of Biochemistry, Genetics and Microbiology, University of Pretoria, Pretoria, South Africa.
| | - P H Lebre
- Centre for Microbial Ecology and Genomics, Department of Biochemistry, Genetics and Microbiology, University of Pretoria, Pretoria, South Africa.
| | - Cer Amon
- Institut National Polytechnique Houphouet-Boigny, Cote d'Ivoire, Yamoussoukro, South Africa
| | - R W Becker
- Biodiversity Research Centre, Department of Agriculture and Natural Resources Sciences, Namibia University of Science and Technology, Windhoek, Namibia
| | - H I Boga
- Taita Taveta University, Voi, Kenya
| | - A Boulangé
- Centro de Biotecnologia, Universidade Eduardo Mondlane, Maputo, Mozambique
- UMR InterTryp, CIRAD-IRD, 34398, Montpellier, France
| | - T L Chiyaka
- Department of Biotechnology and Biochemistry, University of Zimbabwe, Harare, Zimbabwe
| | - T Coetzee
- Centre for Microbial Ecology and Genomics, Department of Biochemistry, Genetics and Microbiology, University of Pretoria, Pretoria, South Africa
| | - P C de Jager
- Department of Plant and Soil Sciences, University of Pretoria, Pretoria, South Africa
| | - O Dikinya
- Department of Environmental Science, University of Botswana, Gaborone, Botswana
| | - F Eckardt
- Department of Geography, University of Cape Town, Cape Town, South Africa
| | - M Greve
- Department of Plant and Soil Sciences, University of Pretoria, Pretoria, South Africa
| | - M A Harris
- Department of Plant and Soil Sciences, University of Pretoria, Pretoria, South Africa
| | - D W Hopkins
- Scotland's Rural College, Edinburgh, EH9 3JG, UK
| | - H B Houngnandan
- Université Nationale d'Agriculture, Porto-Novo, Benin (Laboratoire de Microbiologie Des Sols Et d'Ecologie Microbienne), Porto-Novo, Benin
| | - P Houngnandan
- Université Nationale d'Agriculture, Porto-Novo, Benin (Laboratoire de Microbiologie Des Sols Et d'Ecologie Microbienne), Porto-Novo, Benin
| | - K Jordaan
- Centre for Microbial Ecology and Genomics, Department of Biochemistry, Genetics and Microbiology, University of Pretoria, Pretoria, South Africa
- Departamento de Genética Molecular Y Microbiología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - E Kaimoyo
- University of Zambia, Lusaka, Zambia
| | | | - G Kamgan-Nkuekam
- Centre for Microbial Ecology and Genomics, Department of Biochemistry, Genetics and Microbiology, University of Pretoria, Pretoria, South Africa
| | - T P Makhalanyane
- Department of Biochemistry, Genetics and Microbiology, University of Pretoria, Pretoria, South Africa
| | | | - E Marais
- Gobabeb-Namib Research Institute, Walvis Bay, Namibia
| | - H Mondlane
- Centro de Biotecnologia, Universidade Eduardo Mondlane, Maputo, Mozambique
| | - E Nghalipo
- Biodiversity Research Centre, Department of Agriculture and Natural Resources Sciences, Namibia University of Science and Technology, Windhoek, Namibia
| | - B W Olivier
- Department of Plant and Soil Sciences, University of Pretoria, Pretoria, South Africa
| | - M Ortiz
- Centre for Microbial Ecology and Genomics, Department of Biochemistry, Genetics and Microbiology, University of Pretoria, Pretoria, South Africa
- Department of Biological Sciences, Clemson University, Clemson, SC, USA
| | - L R Pertierra
- Department of Plant and Soil Sciences, University of Pretoria, Pretoria, South Africa
| | - J-B Ramond
- Centre for Microbial Ecology and Genomics, Department of Biochemistry, Genetics and Microbiology, University of Pretoria, Pretoria, South Africa
- Departamento de Genética Molecular Y Microbiología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - M Seely
- Gobabeb-Namib Research Institute, Walvis Bay, Namibia
| | - I Sithole-Niang
- Department of Biotechnology and Biochemistry, University of Zimbabwe, Harare, Zimbabwe
| | - A Valverde
- Centre for Microbial Ecology and Genomics, Department of Biochemistry, Genetics and Microbiology, University of Pretoria, Pretoria, South Africa
| | - G Varliero
- Centre for Microbial Ecology and Genomics, Department of Biochemistry, Genetics and Microbiology, University of Pretoria, Pretoria, South Africa
| | - S Vikram
- Centre for Microbial Ecology and Genomics, Department of Biochemistry, Genetics and Microbiology, University of Pretoria, Pretoria, South Africa
| | - D H Wall
- Department of Biology, Colorado State University, Fort Collins, USA
| | - A Zeze
- Institut National Polytechnique Houphouet-Boigny, Cote d'Ivoire, Yamoussoukro, South Africa
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Crous P, Hernández-Restrepo M, Schumacher R, Cowan D, Maggs-Kölling G, Marais E, Wingfield M, Yilmaz N, Adan O, Akulov A, Duarte EÁ, Berraf-Tebbal A, Bulgakov T, Carnegie A, de Beer Z, Decock C, Dijksterhuis J, Duong T, Eichmeier A, Hien L, Houbraken J, Khanh T, Liem N, Lombard L, Lutzoni F, Miadlikowska J, Nel W, Pascoe I, Roets F, Roux J, Samson R, Shen M, Spetik M, Thangavel R, Thanh H, Thao L, van Nieuwenhuijzen E, Zhang J, Zhang Y, Zhao L, Groenewald J. New and Interesting Fungi. 4. Fungal Syst Evol 2021; 7:255-343. [PMID: 34124627 PMCID: PMC8165967 DOI: 10.3114/fuse.2021.07.13] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Accepted: 04/14/2021] [Indexed: 11/07/2022] Open
Abstract
An order, family and genus are validated, seven new genera, 35 new species, two new combinations, two epitypes, two lectotypes, and 17 interesting new host and / or geographical records are introduced in this study. Validated order, family and genus: Superstratomycetales and Superstratomycetaceae (based on Superstratomyces ). New genera: Haudseptoria (based on Haudseptoria typhae); Hogelandia (based on Hogelandia lambearum); Neoscirrhia (based on Neoscirrhia osmundae); Nothoanungitopsis (based on Nothoanungitopsis urophyllae); Nothomicrosphaeropsis (based on Nothomicrosphaeropsis welwitschiae); Populomyces (based on Populomyces zwinianus); Pseudoacrospermum (based on Pseudoacrospermum goniomae). New species: Apiospora sasae on dead culms of Sasa veitchii (Netherlands); Apiospora stipae on dead culms of Stipa gigantea (Spain); Bagadiella eucalyptorum on leaves of Eucalyptus sp. (Australia); Calonectria singaporensis from submerged leaf litter (Singapore); Castanediella neomalaysiana on leaves of Eucalyptus sp. (Malaysia); Colletotrichum pleopeltidis on leaves of Pleopeltis sp. (South Africa); Coniochaeta deborreae from soil (Netherlands); Diaporthe durionigena on branches of Durio zibethinus (Vietnam); Floricola juncicola on dead culm of Juncus sp. (France); Haudseptoria typhae on leaf sheath of Typha sp. (Germany); Hogelandia lambearum from soil (Netherlands); Lomentospora valparaisensis from soil (Chile); Neofusicoccum mystacidii on dead stems of Mystacidium capense (South Africa); Neomycosphaerella guibourtiae on leaves of Guibourtia sp. (Angola); Niesslia neoexosporioides on dead leaves of Carex paniculata (Germany); Nothoanungitopsis urophyllae on seed capsules of Eucalyptus urophylla (South Africa); Nothomicrosphaeropsis welwitschiae on dead leaves of Welwitschia mirabilis (Namibia); Paracremonium bendijkiorum from soil (Netherlands); Paraphoma ledniceana on dead wood of Buxus sempervirens (Czech Republic); Paraphoma salicis on leaves of Salix cf. alba (Ukraine); Parasarocladium wereldwijsianum from soil (Netherlands); Peziza ligni on masonry and plastering (France); Phyllosticta phoenicis on leaves of Phoenix reclinata (South Africa); Plectosphaerella slobbergiarum from soil (Netherlands); Populomyces zwinianus from soil (Netherlands); Pseudoacrospermum goniomae on leaves of Gonioma kamassi (South Africa); Pseudopyricularia festucae on leaves of Festuca californica (USA); Sarocladium sasijaorum from soil (Netherlands); Sporothrix hypoxyli in sporocarp of Hypoxylon petriniae on Fraxinus wood (Netherlands); Superstratomyces albomucosus on Pycnanthus angolensis (Netherlands); Superstratomyces atroviridis on Pinus sylvestris (Netherlands); Superstratomyces flavomucosus on leaf of Hakea multilinearis (Australia); Superstratomyces tardicrescens from human eye specimen (USA); Taeniolella platani on twig of Platanus hispanica (Germany), and Tympanis pini on twigs of Pinus sylvestris (Spain). Citation: Crous PW, Hernández-Restrepo M, Schumacher RK, Cowan DA, Maggs-Kölling G, Marais E, Wingfield MJ, Yilmaz N, Adan OCG, Akulov A, Álvarez Duarte E, Berraf-Tebbal A, Bulgakov TS, Carnegie AJ, de Beer ZW, Decock C, Dijksterhuis J, Duong TA, Eichmeier A, Hien LT, Houbraken JAMP, Khanh TN, Liem NV, Lombard L, Lutzoni FM, Miadlikowska JM, Nel WJ, Pascoe IG, Roets F, Roux J, Samson RA, Shen M, Spetik M, Thangavel R, Thanh HM, Thao LD, van Nieuwenhuijzen EJ, Zhang JQ, Zhang Y, Zhao LL, Groenewald JZ (2021). New and Interesting Fungi. 4. Fungal Systematics and Evolution 7: 255-343. doi: 10.3114/fuse.2021.07.13.
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Affiliation(s)
- P.W. Crous
- Westerdijk Fungal Biodiversity Institute, Uppsalalaan 8, 3584 CT Utrecht, The Netherlands
- Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute (FABI), Faculty of Natural and Agricultural Sciences, University of Pretoria, Private Bag X20, Hatfield 0028, Pretoria, South Africa
| | - M. Hernández-Restrepo
- Westerdijk Fungal Biodiversity Institute, Uppsalalaan 8, 3584 CT Utrecht, The Netherlands
| | | | - D.A. Cowan
- Centre for Microbial Ecology and Genomics, Department of Biochemistry, Genetics and Microbiology, University of Pretoria, Private Bag X20, Hatfield 0028, Pretoria, South Africa
| | | | - E. Marais
- Gobabeb-Namib Research Institute, Walvis Bay, Namibia
| | - M.J. Wingfield
- Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute (FABI), Faculty of Natural and Agricultural Sciences, University of Pretoria, Private Bag X20, Hatfield 0028, Pretoria, South Africa
| | - N. Yilmaz
- Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute (FABI), Faculty of Natural and Agricultural Sciences, University of Pretoria, Private Bag X20, Hatfield 0028, Pretoria, South Africa
| | - O.C.G. Adan
- Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - A. Akulov
- Department of Mycology and Plant Resistance, V. N. Karazin Kharkiv National University, Maidan Svobody 4, 61022 Kharkiv, Ukraine
| | - E. Álvarez Duarte
- Mycology Unit, Microbiology and Mycology Program, Institute of Biomedical Sciences, University of Chile, Santiago, Chile
| | - A. Berraf-Tebbal
- Mendeleum – Institute of Genetics, Mendel University in Brno, Valtická 334, Lednice, 69144, Czech Republic
| | - T.S. Bulgakov
- Department of Plant Protection, Federal Research Centre the Subtropical Scientific Centre of the Russian Academy of Sciences, Yana Fabritsiusa street 2/28, 354002 Sochi, Krasnodar region, Russia
| | - A.J. Carnegie
- Forest Health & Biosecurity, Forest Science, NSW Department of Primary Industries - Forestry, Level 12, 10 Valentine Ave, Parramatta NSW 2150, Australia
- School of Environment Science and Engineering, Southern Cross University, Lismore, NSW 2480, Australia
| | - Z.W. de Beer
- Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute (FABI), Faculty of Natural and Agricultural Sciences, University of Pretoria, Private Bag X20, Hatfield 0028, Pretoria, South Africa
| | - C. Decock
- Mycothèque de l’Université catholique de Louvain (MUCL, BCCMTM), Earth and Life Institute – ELIM – Mycology, Université catholique de Louvain, Croix du Sud 2 bte L7.05.25, B-1348 Louvain-la-Neuve, Belgium
| | - J. Dijksterhuis
- Westerdijk Fungal Biodiversity Institute, Uppsalalaan 8, 3584 CT Utrecht, The Netherlands
| | - T.A. Duong
- Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute (FABI), Faculty of Natural and Agricultural Sciences, University of Pretoria, Private Bag X20, Hatfield 0028, Pretoria, South Africa
| | - A. Eichmeier
- Mendeleum – Institute of Genetics, Mendel University in Brno, Valtická 334, Lednice, 69144, Czech Republic
| | - L.T. Hien
- Division of Plant Pathology, Plant Protection Research Institute (PPRI), Duc Thang, Bac Tu Liem, Hanoi, Vietnam
| | - J.A.M.P. Houbraken
- Westerdijk Fungal Biodiversity Institute, Uppsalalaan 8, 3584 CT Utrecht, The Netherlands
| | - T.N. Khanh
- Division of Plant Pathology, Plant Protection Research Institute (PPRI), Duc Thang, Bac Tu Liem, Hanoi, Vietnam
| | - N.V. Liem
- Division of Plant Pathology, Plant Protection Research Institute (PPRI), Duc Thang, Bac Tu Liem, Hanoi, Vietnam
| | - L. Lombard
- Westerdijk Fungal Biodiversity Institute, Uppsalalaan 8, 3584 CT Utrecht, The Netherlands
| | - F.M. Lutzoni
- Department of Biology, Duke University, Durham, NC 27708, USA
| | | | - W.J. Nel
- Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute (FABI), Faculty of Natural and Agricultural Sciences, University of Pretoria, Private Bag X20, Hatfield 0028, Pretoria, South Africa
| | - I.G. Pascoe
- 30 Beach Road, Rhyll, Victoria 3923, Australia
| | - F. Roets
- Department of Conservation Ecology and Entomology, Stellenbosch University, Stellenbosch 7600, South Africa
| | - J. Roux
- Department of Plant and Soil Sciences, Forestry and Agricultural Biotechnology Institute (FABI), Faculty of Natural and Agricultural Sciences, University of Pretoria, Private Bag X20, Hatfield 0028, Pretoria, South Africa
| | - R.A. Samson
- Westerdijk Fungal Biodiversity Institute, Uppsalalaan 8, 3584 CT Utrecht, The Netherlands
| | - M. Shen
- School of Ecology and Nature Conservation, Beijing Forestry University, P.O. Box 61, Beijing 100083, PR China
| | - M. Spetik
- Mendeleum – Institute of Genetics, Mendel University in Brno, Valtická 334, Lednice, 69144, Czech Republic
| | - R. Thangavel
- Plant Health and Environment Laboratory, Ministry for Primary Industries, P.O. Box 2095, Auckland 1140, New Zealand
| | - H.M. Thanh
- Division of Plant Pathology, Plant Protection Research Institute (PPRI), Duc Thang, Bac Tu Liem, Hanoi, Vietnam
| | - L.D. Thao
- Division of Plant Pathology, Plant Protection Research Institute (PPRI), Duc Thang, Bac Tu Liem, Hanoi, Vietnam
| | | | - J.Q. Zhang
- School of Ecology and Nature Conservation, Beijing Forestry University, P.O. Box 61, Beijing 100083, PR China
| | - Y. Zhang
- School of Ecology and Nature Conservation, Beijing Forestry University, P.O. Box 61, Beijing 100083, PR China
| | - L.L. Zhao
- School of Ecology and Nature Conservation, Beijing Forestry University, P.O. Box 61, Beijing 100083, PR China
| | - J.Z. Groenewald
- Westerdijk Fungal Biodiversity Institute, Uppsalalaan 8, 3584 CT Utrecht, The Netherlands
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Uyi OO, Zachariades C, Marais E, Hill MP. Reduced mobility but high survival: thermal tolerance and locomotor response of the specialist herbivore, Pareuchaetes insulata (Walker) (Lepidoptera: Erebidae), to low temperatures. Bull Entomol Res 2017; 107:448-457. [PMID: 27974070 DOI: 10.1017/s0007485316001103] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Disentangling the responses of insects to variations in their thermal environment is central to our understanding of the evolution of temperature-dependent performance in these species. Here, we report results of experiments examining the effects of high (upper lethal temperature = ULT) and low (lower lethal temperature = LLT) temperature and exposure time on the survival of larvae and adults of a multivoltine, nocturnal moth species, Pareuchaetes insulata, a biological control agent whose impact on an invasive weed, Chromolaena odorata has been variable in South Africa. The influence of temperature and acclimation on locomotion performance of the moth was also investigated. Temperature and duration of exposure significantly affected survival of both adults and larvae of P. insulata with more extreme temperatures and/or longer durations proving to be more lethal. Third instar larvae and adults are both freeze intolerant and had LT50 of -5.9 and -4.7°C, respectively, after a 2 h exposure. Although cold acclimation was beneficial to the nocturnal larvae, temperatures below 10°C significantly reduce their locomotion activities. The average daily minimum temperatures in the coldest months at three locations in South Africa are over 5°C lower than those of Fort Lauderdale, Florida, USA, where P. insulata was originally collected. Our results suggest that lethal high or low temperatures at short timescales are trivial in explaining the variable performance of P. insulata, but reduced locomotion at sub-lethal temperatures may be an important driver of the population dynamics of the biocontrol agent (especially in winter months) and may consequently explain the low population levels of the moth because of possible reduced feeding by larvae during night-time low temperatures.
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Affiliation(s)
- O O Uyi
- Department of Animal and Environmental Biology,University of Benin,P.M.B. 1154, Benin City,Nigeria
| | - C Zachariades
- ARC - Plant Protection Research Institute,Private Bag X6006, Hilton 3245,South Africa
| | - E Marais
- Centre for Invasion Biology,Stellenbosch University,Private Bag X01, Matieland 7602,South Africa
| | - M P Hill
- Department of Zoology and Entomology,Rhodes University,P.O. Box 94, Grahamstown 6140,South Africa
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Webster I, Salie R, Marais E, Fan WJ, Maarman G, Huisamen B, Lochner A. Myocardial susceptibility to ischaemia/reperfusion in obesity: a re-evaluation of the effects of age. BMC Physiol 2017; 17:3. [PMID: 28302152 PMCID: PMC5356245 DOI: 10.1186/s12899-017-0030-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Accepted: 02/23/2017] [Indexed: 12/15/2022]
Abstract
Background Reports on the effect of age and obesity on myocardial ischaemia/reperfusion (I/R) injury and ischaemic preconditioning are contradictory. The aim of this study was to re-evaluate the effects of age and diet-induced obesity (DIO) on myocardial I/R injury and preconditioning potential. Methods Four groups of Wistar male rats were used: age-matched controls (AMC) receiving standard rat chow for (i) 16 weeks and (ii) 16 months respectively; DIO rats receiving a sucrose-supplemented diet for (iii) 16 weeks and (iv) 16 months respectively. The ages of groups (i) and (iii) were 22 weeks (“young”) and groups (ii) and (iv) 17 months (“middle-aged”) at time of experimentation. Isolated perfused working hearts were subjected to 35 min regional ischaemia/1 h reperfusion. Endpoints were infarct size (tetrazolium staining) and functional recovery. Hearts were preconditioned by 3 × 5 min ischaemia/5 min reperfusion. Results were processed using GraphPad Prism statistical software. Results Age did not affect baseline heart function before induction of ischaemia and I/R damage as indicated by infarct size and similar values were obtained in hearts from both age groups. Age also had no effect on functional recovery of hearts during reperfusion after regional ischaemia in AMC rats, but cardiac output during reperfusion was better in hearts from middle-aged than young DIO rats. The diet reduced infarct size in hearts from young rats (% of area at risk: AMC: 32.4 ± 3.6; DIO: 20.7 ± 2.9, p < 0.05), with no differences in hearts from middle-aged rats (AMC: 24.6 ± 4.6; DIO: 28.3 ± 13.5, p = NS). Compared to their respective AMC, diet-induced obesity had no significant effect on functional recovery of hearts from both age groups after exposure to regional ischaemia. When exposed to the more severe stress of global ischaemia, the functional recovery potential of middle-aged DIO rats appeared to be impeded compared to hearts of young DIO rats, while age had no effect on the functional recovery of AMC hearts. Preconditioning reduced infarct size in hearts from young control rats and both middle-aged groups, but not from young DIO rats. Age had a significant effect on functional recovery in preconditioning: it was improved in hearts from young control and DIO rats, but depressed in both middle-aged groups. Conclusions The data showed that middle-age and obesity had no effect on baseline myocardial function and did not increase susceptibility to I/R damage upon exposure to regional ischaemia. On the contrary, obesity reduced I/R damage in young rats. Preconditioned aging hearts showed a decreased infarct size, but a reduction in functional recovery.
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Affiliation(s)
- I Webster
- Division of Medical Physiology, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, University of Stellenbosch, Stellenbosch, South Africa
| | - R Salie
- Division of Medical Physiology, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, University of Stellenbosch, Stellenbosch, South Africa
| | - E Marais
- Division of Medical Physiology, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, University of Stellenbosch, Stellenbosch, South Africa
| | - W-J Fan
- Division of Medical Physiology, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, University of Stellenbosch, Stellenbosch, South Africa
| | - G Maarman
- Division of Medical Physiology, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, University of Stellenbosch, Stellenbosch, South Africa
| | - B Huisamen
- Division of Medical Physiology, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, University of Stellenbosch, Stellenbosch, South Africa.,Biotechnology and Innovation Platform of the SA Medical Research Council, Cape Town, South Africa
| | - A Lochner
- Division of Medical Physiology, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, University of Stellenbosch, Stellenbosch, South Africa.
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Osto E, Planavila A, Huisamen B, Doytcheva P, Baechler T, Tarasco E, Pellegrini G, Matter C, Lutz T, Luescher T, Ruperez C, Lerin C, Mas-Stachurska A, Sitges M, Giralt M, Villarroya F, Van Vuuren M, Espach Y, Marais E, Lochner A. Obesity and Cardiac Microvascular Function496Roux-en-y gastric bypass surgery reverses obesity-induced vascular dysfunction by blunting jnk2-endothelial activation497Involvement of the Fgf21 system in obesity-associated cardiomyopathy498Is low ATM protein responsible for myocardial insulin resistance associated with obesity? Cardiovasc Res 2016. [DOI: 10.1093/cvr/cvw147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Carqueijeiro I, Masini E, Foureau E, Sepúlveda LJ, Marais E, Lanoue A, Besseau S, Papon N, Clastre M, Dugé de Bernonville T, Glévarec G, Atehortùa L, Oudin A, Courdavault V. Virus-induced gene silencing in Catharanthus roseus by biolistic inoculation of tobacco rattle virus vectors. Plant Biol (Stuttg) 2015; 17:1242-6. [PMID: 26284695 DOI: 10.1111/plb.12380] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Accepted: 08/11/2015] [Indexed: 05/15/2023]
Abstract
Catharanthus roseus constitutes the unique source of several valuable monoterpenoid indole alkaloids, including the antineoplastics vinblastine and vincristine. These alkaloids result from a complex biosynthetic pathway encompassing between 30 and 50 enzymatic steps whose characterisation is still underway. The most recent identifications of genes from this pathway relied on a tobacco rattle virus-based virus-induced gene silencing (VIGS) approach, involving an Agrobacterium-mediated inoculation of plasmids encoding the two genomic components of the virus. As an alternative, we developed a biolistic-mediated approach of inoculation of virus-encoding plasmids that can be easily performed by a simple bombardment of young C. roseus plants. After optimisation of the transformation conditions, we showed that this approach efficiently silenced the phytoene desaturase gene, leading to strong and reproducible photobleaching of leaves. This biolistic transformation was also used to silence a previously characterised gene from the alkaloid biosynthetic pathway, encoding iridoid oxidase. Plant bombardment caused down-regulation of the targeted gene (70%), accompanied by a correlated decreased in MIA biosynthesis (45-90%), similar to results obtained via agro-transformation. Thus, the biolistic-based VIGS approach developed for C. roseus appears suitable for gene function elucidation and can readily be used instead of the Agrobacterium-based approach, e.g. when difficulties arise with agro-inoculations or when Agrobacterium-free procedures are required to avoid plant defence responses.
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Affiliation(s)
- I Carqueijeiro
- EA2106 Biomolécules et Biotechnologies Végétales, Université François-Rabelais de Tours, Tours, France
| | - E Masini
- EA2106 Biomolécules et Biotechnologies Végétales, Université François-Rabelais de Tours, Tours, France
| | - E Foureau
- EA2106 Biomolécules et Biotechnologies Végétales, Université François-Rabelais de Tours, Tours, France
| | - L J Sepúlveda
- Laboratorio de Biotecnología, Sede de Investigación Universitaria, Universidad de Antioquia, Medellín, Colombia
| | - E Marais
- EA2106 Biomolécules et Biotechnologies Végétales, Université François-Rabelais de Tours, Tours, France
| | - A Lanoue
- EA2106 Biomolécules et Biotechnologies Végétales, Université François-Rabelais de Tours, Tours, France
| | - S Besseau
- EA2106 Biomolécules et Biotechnologies Végétales, Université François-Rabelais de Tours, Tours, France
| | - N Papon
- EA2106 Biomolécules et Biotechnologies Végétales, Université François-Rabelais de Tours, Tours, France
| | - M Clastre
- EA2106 Biomolécules et Biotechnologies Végétales, Université François-Rabelais de Tours, Tours, France
| | - T Dugé de Bernonville
- EA2106 Biomolécules et Biotechnologies Végétales, Université François-Rabelais de Tours, Tours, France
| | - G Glévarec
- EA2106 Biomolécules et Biotechnologies Végétales, Université François-Rabelais de Tours, Tours, France
| | - L Atehortùa
- Laboratorio de Biotecnología, Sede de Investigación Universitaria, Universidad de Antioquia, Medellín, Colombia
| | - A Oudin
- EA2106 Biomolécules et Biotechnologies Végétales, Université François-Rabelais de Tours, Tours, France
| | - V Courdavault
- EA2106 Biomolécules et Biotechnologies Végétales, Université François-Rabelais de Tours, Tours, France
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Huisamen B, Genis A, Marais E, Strijdom H. P507DPP-4 inhibition is cardioprotective and restores pancreatic function in obese, insulin resistant rats. Cardiovasc Res 2014. [DOI: 10.1093/cvr/cvu091.180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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8
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Marais E, Mlambo CK, Lewis JJ, Rastogi N, Zozio T, Grobusch MP, Duse A, Victor T, Warren RW. Treatment outcomes of multidrug-resistant tuberculosis patients in Gauteng, South Africa. Infection 2013; 42:405-13. [PMID: 24363208 DOI: 10.1007/s15010-013-0572-2] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2013] [Accepted: 12/10/2013] [Indexed: 10/25/2022]
Abstract
PURPOSE Multidrug-resistant tuberculosis (MDR-TB) is associated with lengthy treatment, expensive and potentially toxic regimens, and high rates of treatment failure and death. This study describes the outcomes of 351 MDR-TB patients who started treatment between 2004 and 2007 at the provincial MDR-TB referral hospital in Johannesburg, South Africa, and investigates risk factors associated with death. METHODS The study involved the assessment of factors associated with treatment outcomes using a retrospective review of patient records, drug-susceptibility data and spoligotyping of isolates. RESULTS Treatment success (completion/cure) was recorded in 158 (48.8 %) patients, while 65 (20 %) died, 93 (28.7 %) defaulted, 8 (2.5 %) failed treatment, 11(3.1 %) were transferred out to other health facilities and 16 (4.6 %) had no recorded final outcome. The proportion of successful treatment increased significantly over time. Univariable and multivariable analysis (P = 0.05) identified the year of MDR-TB diagnosis and spoligotype-defined families as factors associated with treatment outcome. No associations were found between treatment outcome and human immunodeficiency virus (HIV) status, previous TB and additional MDR resistance to streptomycin or ethambutol. Molecular typing of the strains revealed a diverse group of spoligotypes, with Beijing, LAM4 and H3 making up the largest groups. CONCLUSIONS This is the first published study to investigate treatment outcomes at this facility and to find a link between genotype and treatment outcome, suggesting that genotype determination could potentially serve as a prognostic factor.
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Affiliation(s)
- E Marais
- Department of Clinical Microbiology and Infectious Diseases, School of Pathology, University of the Witwatersrand and National Health Laboratory Service, Johannesburg, South Africa,
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Marais E, Aithma N, Perovic O, Oosthuysen WF, Musenge E, Dusé AG. Antimicrobial susceptibility of methicillin-resistant Staphylococcus aureus isolates from South Africa. S Afr Med J 2009; 99:170-173. [PMID: 19563094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023] Open
Abstract
OBJECTIVE Trends in the antibiotic susceptibility of methicillin-resistant Staphylococcus aureus (MRSA) are regularly investigated in many countries, but minimal countrywide data are available for South Africa. The aim of this study was to describe the antibiotic susceptibility patterns of MRSA isolates collected in South Africa. DESIGN Susceptibility testing of 248 MRSA isolates collected from 15 National Health Laboratory Services (NHLS) and 8 private laboratories against 17 antibiotics was performed using the disc diffusion method. Demographic data were collected and correlated with antibiotic resistance patterns. RESULTS Antibiotic resistance of MRSA to erythromycin, tetracycline, trimethoprim/sulfamethoxazole, gentamicin and ciprofloxacin ranged between 55% and 78%, while all isolates were susceptible to teicoplanin, linezolid, vancomycin and quinopristin/dalfopristin. A significant difference in the resistance pattern of the isolates towards certain antimicrobial agents was identified among adults and children, as well as between isolates collected from the private and NHLS laboratories. CONCLUSION This is the first extensive report on the antimicrobial susceptibilities of South African MRSA isolates. These data can assist treatment decisions and form a baseline for further surveillance.
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Affiliation(s)
- E Marais
- Department of Clinical Microbiology and Infectious Diseases, University of the Witwatersrand and National Health Laboratory Services, Johannesburg.
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Uhlig M, Marais E. Hansen, M. (1999): Hydrophiloidea (s. str.) (Coleoptera). In: World Catalogue of Insects 2: 1-416. Published by Apollo Books Aps, Kirkeby Sand 19, DK-5771 Stenstrup, Denmark. ISBN 87-88757-31-5 Hardback. DKK 690.00. ZOOSYST EVOL 2008. [DOI: 10.1002/mmnz.20030790207] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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11
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Uhlig M, Marais E. Hansen, M. (1998): Hydraenidae (Coleoptera). In: World Catalogue of Insects 1: 1-169. Published by Apollo Books Aps, Kirkeby Sand 19, DK-5771 Stenstrup, Denmark. ISBN 87-88757-27-7 Hardback. DKK 290.00. ZOOSYST EVOL 2008. [DOI: 10.1002/mmnz.20030790206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
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12
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Mlambo CK, Warren RM, Poswa X, Victor TC, Duse AG, Marais E. Genotypic diversity of extensively drug-resistant tuberculosis (XDR-TB) in South Africa. Int J Tuberc Lung Dis 2008; 12:99-104. [PMID: 18173885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023] Open
Abstract
SETTING The epidemiology of extensively drug-resistant tuberculosis (XDR-TB), an emerging threat to TB control, is not well understood. OBJECTIVE To gain insight into the genotypic population structure of XDR Mycobacterium tuberculosis strains in South Africa using a molecular approach and thereby determine whether XDR-TB is mainly acquired or transmitted. DESIGN Sputum isolates from patients with multidrug-resistant tuberculosis (MDR-TB) were submitted to the National Referral Laboratory for second-line drug susceptibility testing. The XDR-TB isolates were spoligotyped and these data were compared to the geographic origin of the isolate. RESULTS Of the 699 MDR-TB isolates submitted for testing between June 2005 and December 2006, 101 (17%) patients had a culture that was resistant to either ofloxacin or kanamycin, and 41 (6%) were resistant to both drugs (XDR-TB). Spoligotyping of the XDR-TB isolates identified 17 genotypes. As a result of the high genotypic diversity and geographical distribution, we estimate that between 63% and 75% of cases developed XDR-TB through acquisition. CONCLUSION Acquisition of extensive drug resistance appears to be the primary mechanism driving the XDR-TB epidemic in South Africa. This urgent TB control issue has to be addressed to prevent the spread of this potentially incurable disease.
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Affiliation(s)
- C K Mlambo
- Clinical Microbiology and Infectious Disease, National Health Laboratory Services, University of the Witwatersrand, Johannesburg, Gauteng, South Africa
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Marais E, Irlich U, Chown S. 22.5. Survival of subzero temperatures as a metabolic strategy: A test of the metabolic control hypothesis. Comp Biochem Physiol A Mol Integr Physiol 2007. [DOI: 10.1016/j.cbpa.2007.06.260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Oosthuysen W, Dusé A, Marais E. P1296 Molecular characterisation of methicillin-resistant Staphylococcus aureus in South Africa. Int J Antimicrob Agents 2007. [DOI: 10.1016/s0924-8579(07)71136-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Thorrold CA, Letsoalo ME, Dusé AG, Marais E. Efflux pump activity in fluoroquinolone and tetracycline resistant Salmonella and E. coli implicated in reduced susceptibility to household antimicrobial cleaning agents. Int J Food Microbiol 2006; 113:315-20. [PMID: 17126442 DOI: 10.1016/j.ijfoodmicro.2006.08.008] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2005] [Revised: 11/12/2005] [Accepted: 08/24/2006] [Indexed: 10/23/2022]
Abstract
It has been shown that the inappropriate use of antimicrobial household agents selects for organisms with resistance mechanisms (e.g. efflux pumps), which could lead to the development of antibiotic resistance. The reverse hypothesis, that antibiotic-resistant organisms become tolerant to other antibacterial agents (e.g. disinfectants) due to the action of efflux pumps, has however not been extensively examined. The objective of this study was to establish whether there is a link between antibiotic resistance in potential gastrointestinal pathogens and reduced sensitivity of these organisms to commonly used household antimicrobial agents. In this study, tetracycline and ofloxacin sensitive and resistant Escherichia coli (9 strains) and Salmonella spp. (8 strains) were isolated from poultry and clinical samples. In order to assess whether these bacteria had active efflux pumps, ethidium bromide accumulation assays were performed. Extrusion of the active components of three commercial household agents (triclosan, sodium salicylate, and ortho-phenylphenol) by efflux pumps was tested using spectrophotometric accumulation assays. In order to simulate the kitchen environment, in-use disinfectant testing using the commercial household agents was performed to determine changes in their efficacy due to antibiotic resistance. Active efflux pump activity and extrusion of all three active ingredients was observed only in the antibiotic resistant organisms. The antibiotic sensitive bacteria were also more susceptible than the resistant isolates to the household antimicrobial agents at concentrations below that recommended by the manufacturer. These resistant bacteria could potentially be selected for and result in hard to treat infections.
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Affiliation(s)
- C A Thorrold
- Department of Clinical Microbiology and Infectious Diseases, University of the Witwatersrand Medical School and National Health Laboratory Services, P.O. Box 2115, Houghton 2041, Johannesburg, South Africa
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Chown SL, Marais E, Picker MD, Terblanche JS. Gas exchange characteristics, metabolic rate and water loss of the Heelwalker, Karoophasma biedouwensis (Mantophasmatodea: Austrophasmatidae). J Insect Physiol 2006; 52:442-9. [PMID: 16466738 DOI: 10.1016/j.jinsphys.2005.12.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2005] [Revised: 12/16/2005] [Accepted: 12/20/2005] [Indexed: 05/06/2023]
Abstract
This study presents the first physiological information for a member of the wingless Mantophasmatodea, or Heelwalkers. This species shows cyclic gas exchange with no evidence of a Flutter period (more typical of discontinuous gas exchange in insects) and no indication that the spiracles are fully occluded during quiescent metabolism. Standard metabolic rate at 20 degrees C was 21.32+/-2.73 microl CO(2)h(-1) (mean+/-S.E.), with a Q(10) (10-25 degrees C) of 1.7. Increases in V()CO(2) associated with variation in mass and with trial temperature were modulated by an increase in burst period volume and a decline in cycle frequency. Total water loss rate, determined by infrared gas analysis, was 0.876+/-0.08 mg H(2)Oh(-1) (range 0.602-1.577, n=11) whilst cuticular water loss rate, estimated by linear regression of total water loss rate and metabolic rate, was 0.618+/-0.09 mg H(2)Oh(-1) (range 0.341-1.363, n=11). Respiratory water loss rate was therefore no more than 29% of the total rate of water loss. Both total water loss rate and estimated cuticular water loss rate were significantly repeatable, with intraclass correlation coefficients of 0.745 and 0.553, respectively.
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Affiliation(s)
- S L Chown
- DST-NRF Centre for Invasion Biology, Department of Botany and Zoology, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa.
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van Nierop W, Dusé AG, Marais E, Aithma N, Thothobolo N, Kassel M, Stewart R, Potgieter A, Fernandes B, Galpin JS, Bloomfield SF. Contamination of chicken carcasses in Gauteng, South Africa, by Salmonella, Listeria monocytogenes and Campylobacter. Int J Food Microbiol 2005; 99:1-6. [PMID: 15718024 DOI: 10.1016/j.ijfoodmicro.2004.06.009] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2003] [Revised: 04/26/2004] [Accepted: 06/09/2004] [Indexed: 11/15/2022]
Abstract
The presence of the foodborne pathogens, Salmonella spp., Listeria monocytogenes and Campylobacter spp., on 99 fresh and frozen chicken carcasses sourced from various retailers in Gauteng, South Africa, was investigated. Using culture methods, 60.6% of the carcasses were found to be contaminated with one or more pathogens, with 19.2%, 19.2% and 32.3% of the carcasses being found to harbour Salmonella, L. monocytogenes and Campylobacter, respectively. The extent of contamination with one or more pathogens was not significantly different (p>0.1) between fresh or frozen samples or between samples from butcheries, supermarkets or street vendors. Significantly more (p<0.1) fresh carcasses from butcheries than from other outlets were contaminated with Salmonella, while more fresh carcasses from supermarkets were contaminated with Campylobacter. The proportion of carcasses with L. monocytogenes from all sources were similar. Polymerase chain reaction (PCR) results indicate an even higher extent of pathogen contamination, but the PCR techniques need to be further refined before they can be used routinely.
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Affiliation(s)
- W van Nierop
- Department of Clinical Microbiology and Infectious Diseases, University of the Witwatersrand Medical School and National Health Laboratory Services, P.O. Box 2115, Houghton 2041, South Africa
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De Jong G, Duse A, Richards G, Marais E. Back to basics—optimizing the use of available resources during an outbreak of multi-drug resistant Acinetobacter spp. J Hosp Infect 2004; 57:186-7. [PMID: 15183255 DOI: 10.1016/j.jhin.2004.03.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Abstract
To further evaluate the significance of p38 MAPK as trigger or mediator in ischaemic preconditioning, anisomycin and SB 203580 were used to manipulate its activation status. Special attention was given to the concentration of the drugs and protocols used. The isolated perfused rat heart, subjected to either 25 min global ischaemia or 35 min regional ischaemia, was used as experimental model. This was preceded by anisomycin (2 or 5 muM: 3 x 5 min; 5 muM: 5 min or 10 min; 5 muM: 10 min + 10 min washout or 20 muM: 20 min) or SB 203580 (2 muM: 3 x 5 min; before and during 3 x 5 min or 1 x 5 min ischaemic preconditioning; 10 min). Endpoints were functional recovery during reperfusion and infarct size.Anisomycin, regardless of the protocol, reduced infarct size, but did not improve functional recovery. In a number of experiments activation of JNK by anisomycin was blocked by SP 600125 (10 muM). SP 600125 had no effect on the anisomycin-induced reduction in infarct size. SB 203580 when administered for 10 min before sustained ischaemia, improved functional recovery and reduced infarct size. SB 203580 could not abolish the beneficial effects of a multi-cycle preconditioning protocol, but it significantly reduced the outcome of 1 x 5 min preconditioning. In all hearts improved functional recovery and reduction in infarct size were associated with attenuation of p38 MAPK activation during sustained ischaemia-reperfusion. The results indicate that activation of p38 MAPK acts as a trigger of preconditioning, while attenuation of its activation is a prerequisite for improved recovery and a reduction in infarct size.
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Affiliation(s)
- A Lochner
- MRC Diabetes Research Group, Tygerberg, Republic of South Africa.
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20
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Marais E, Stewart R, Dusé AG, Rosekilly IC, de Jong G, Aithma N. Candida parapsilosis detected in TPN using the BacT/Alert system and characterized by randomly amplified polymorphic DNA. J Hosp Infect 2004; 56:291-6. [PMID: 15066740 DOI: 10.1016/j.jhin.2004.01.014] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2003] [Accepted: 01/07/2004] [Indexed: 11/25/2022]
Abstract
Candida parapsilosis was detected in environmental swabs and batches of total parenteral nutrition (TPN) products after routine monitoring. The isolates were analysed using randomly amplified polymorphic DNA (RAPD) to determine clonality and establish the most likely source of contamination. Of 20 isolates analysed, 18 were indistinguishable clonally and were found to be associated with particular work stations. The application of regular testing using a system such as the BacT/Alert, and molecular studies for epidemiological analysis, is of benefit to producers of medical products such as TPN to ensure patient safety.
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Affiliation(s)
- E Marais
- Department of Clinical Microbiology and Infectious Diseases, National Health Laboratory Services and University of the Witwatersrand, Johannesburg, PO Box 2115, Houghton 2041, South Africa.
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Uhlig M, Marais E. Hansen, M. (1999): Hydrophiloidea (s. str.) (Coleoptera). In: World Catalogue of Insects 2: 1–416. Published by Apollo Books Aps, Kirkeby Sand 19, DK-5771 Stenstrup, Denmark. ISBN 87-88757-31-5 Hardback. DKK 690.00. ZOOSYST EVOL 2003. [DOI: 10.1002/mmnz.4850790207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
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Marais E, Genade S, Strijdom H, Moolman JA, Lochner A. p38 MAPK activation triggers pharmacologically-induced beta-adrenergic preconditioning, but not ischaemic preconditioning. J Mol Cell Cardiol 2001; 33:2157-77. [PMID: 11735262 DOI: 10.1006/jmcc.2001.1478] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
p38 Mitogen-activated protein kinase (p38 MAPK) is activated by short episodes of ischaemia-reperfusion as well as by sustained ischemia followed by reperfusion, Whether activation of this kinase is beneficial or deleterious to the ischaemic heart is still a subject of controversy. Since transient beta-adrenergic stimulation (5 min) stimulates p38 MAPK activation and mimics the cardioprotection of ischaemic preconditioning, it was used as a tool to further evaluate the role of this kinase in cardioprotection. The isolated perfused working rat heart, subjected to 25 min ischaemia and 30 min reperfusion was used as experimental model. p38 MAPK and ATF2 activation was determined using Western blots. The results showed that isoproterenol stimulated p38 MAPK in a dose- and time-dependent manner. Ischaemia-induced activation of p38 MAPK could be partially abolished by beta- and alpha1-adrenergic receptor blockade. Isoproterenol activation of the kinase could be abolished by alprenolol and verapamil, but not by 8-cyclopentyladenosine. p38 MAPK activation induced by either a multi-episode preconditioning protocol or isoproterenol (10(-7) M for 5 min) was associated with a significant reduction in p38 MAPK activation at all time intervals studied during 25 min global ischaemia and at 20 and 30 min of reperfusion, compared with the marked activation observed in untreated non-preconditioned hearts. In each case attenuation of p38 MAPK activation during ischaemia and during reperfusion was associated with improved functional recovery during reperfusion. Cyclic elevations in tissue cAMP during an ischaemic preconditioning protocol acted as trigger of cardioprotection, since pretreatment of such hearts with alprenolol abolished cardioprotection. Mechanical failure in such hearts was characterized by a significant stimulation of p38 MAPK activity during ischaemia and reperfusion. However, p38 MAPK activation during an ischaemic preconditioning protocol did not act as trigger: inhibition of p38 MAPK activation by SB 203580 during the preconditioning phase did not abolish cardioprotection. In fact, functional recovery was significantly better than that of untreated preconditioned hearts. On the other hand, SB 203580, when administered before and during the isoproterenol-preconditioning protocol abolished cardioprotection, suggesting that p38 MAPK activation by a beta -adrenergic-induced preconditioning protocol does act as trigger of cardioprotection. In addition, attenuation of p38 MAPK activity during sustained ischaemia and reperfusion as occurs in ischaemic- or isoproterenol-preconditioned hearts, is beneficial.
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Affiliation(s)
- E Marais
- Department of Medical Physiology, University of Stellenbosch Faculty of Health Sciences, Tygerberg, Republic of South Africa
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Huisamen B, Marais E, Genade S, Lochner A. Serial changes in the myocardial beta-adrenergic signalling system in two models of non-insulin dependent diabetes mellitus. Mol Cell Biochem 2001; 219:73-82. [PMID: 11354257 DOI: 10.1023/a:1011014909231] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Since it was reported in 1991 by Schaffer et al. that myocardial contractile responsiveness was altered in NIDDM in the absence of alterations in the beta-adrenergic receptor population, researchers have been seeking a post-receptor defect to account for this. The present study addresses this issue by comparing alterations occurring in the myocardial beta-receptor signalling pathway in two different models of rat NIDDM, as well as the response of the pathway after stimulation with isoproterenol in the presence or absence of insulin. The characteristics of the beta-receptor population, adenylyl cyclase activity and cAMP levels were determined at three different ages. The main results demonstrate that: (i) the two models of NIDDM myocardium differ biochemically; (ii) the beta-adrenergic signalling system of the insulin deficient model was altered more than the hyperinsulinemic model and (iii) the observed exaggerated cAMP response of NIDDM hearts after stimulation with a beta-adrenergic agonist is in contrast with lower responsivity.
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Affiliation(s)
- B Huisamen
- Department of Medical Physiology and Biochemistry, Faculty of Medicine, University of Stellenbosch, Tygerberg, Republic of South Africa
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Abstract
High-voltage activated calcium channels are modulated by a series of auxiliary proteins, including those of the alpha(2)delta family. Until recently, only a single alpha(2)delta subunit was known, but two further members, alpha(2)delta-2 and -3, have since been identified. In this study, the structure of these two novel subunits has been characterized and binding of the antiepileptic drug gabapentin investigated. Using antibodies directed against the amino terminal portion of the proteins, the gross structure of the subunits could be analyzed by Western blotting. Similar to alpha(2)delta-1, both alpha(2)delta-2 and -3 subunits consist of two proteins-a larger alpha(2) and a smaller delta that can be separated by reduction. The subunits are also highly N-glycosylated with approximately 30 kDa of their mass consisting of oligosaccharides. alpha(2)delta-1 was detected in all mouse tissues studied, whereas alpha(2)delta-2 was found at high levels in brain and heart. The alpha(2)delta-3 subunit was observed only in brain. alpha(2)delta-1 and alpha(2)delta-2, but not alpha(2)delta-3, were found to bind gabapentin. The K(d) value of gabapentin binding to alpha(2)delta-2 was 153 nM compared with the higher affinity binding to alpha(2)delta-1 (K(d) = 59 nM).
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Affiliation(s)
- E Marais
- Institut für Pharmakologie und Toxikologie der Technischen Universität München, München, Germany
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Marais E, Genade S, Huisamen B, Strijdom JG, Moolman JA, Lochner A. Activation of p38 MAPK induced by a multi-cycle ischaemic preconditioning protocol is associated with attenuated p38 MAPK activity during sustained ischaemia and reperfusion. J Mol Cell Cardiol 2001; 33:769-78. [PMID: 11273729 DOI: 10.1006/jmcc.2001.1347] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The role of p38 mitogen-activated protein kinase (MAPK) in ischaemic preconditioning remains controversial. Since most previous studies focussed on events only during sustained ischaemia, the aim of this study was to establish the activation pattern of p38 MAPK during a multicycle preconditioning protocol, sustained ischaemia as well as reperfusion and to correlate these events with functional recovery of the isolated perfused rat heart. Isolated perfused rat hearts were preconditioned by 3x5 min global ischaemia followed by 25 min global ischaemia and 30 min reperfusion. Non-preconditioned hearts were subjected to 25 min global ischaemia and 30 min reperfusion. Hearts were freeze-clamped and p38 MAPK activation in tissue lysates was assessed by standard Western blotting techniques, using a dual phospho-p38 MAPK antibody as well as a non-radioactive IP-kinase assay. The results showed that transient dual phosphorylation and activation of p38 MAPK occurs during a 3x5 min preconditioning protocol: the activation was maximal during the first episode, becoming progressively lower during the second and third episodes. p38 MAPK activation was significantly less during both sustained ischaemia and reperfusion in preconditioned hearts, when compared with non-preconditioned hearts. Attenuation of p38 MAPK activity during sustained ischaemia and reperfusion was associated with improved functional recovery. The effect of inhibition of p38 MAPK activation on cardioprotection was further evaluated in adult, isolated cardiomyocytes. Administration of SB 203580 (1-10 microM) before and during the preconditioning protocol, had no effect on cell morphology and viability after 2 h hypoxia, compared to untreated preconditioned cardiomyocytes. When administered to non-preconditioned cells before the onset of 2 h hypoxia, it caused a significant improvement in both morphology and viability. In summary, the results suggest that attenuation of the kinase activity during sustained ischaemia and reperfusion may be an essential element of the preconditioning process.
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Affiliation(s)
- E Marais
- Department of Medical Physiology and Biochemistry, University of Stellenbosch Faculty of Medicine, Tygerberg, Republic of South Africa
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Abstract
To determine whether nitric oxide (NO) is involved in classic preconditioning (PC), the effect of NO donors as well as inhibition of the L-arginine-NO-cGMP pathway were evaluated on 1) the functional recovery during reperfusion of ischemic rat hearts and 2) cyclic nucleotides during both the PC protocol and sustained ischemia. Tissue cyclic nucleotides were manipulated with NO donors [S-nitroso-N-penicillamine (SNAP), sodium nitroprusside (SNP), or L-arginine] and inhibitors of nitric oxide synthase (N(omega)-nitro-L-arginine methyl ester or N-nitro-L-arginine) or guanylyl cyclase (1H-[1,2,4]oxadiazolol-[4,3-a]quinoxaline-1-one). Pharmacological elevation in tissue cGMP levels by SNAP or SNP before sustained ischemia elicited functional improvement during reperfusion comparable to that by PC. Administration of inhibitors before and during the PC protocol partially attenuated functional recovery, whereas they had no effect when given after the ischemic PC protocol and before sustained ischemia only, indicating a role for NO as a trigger but not as a mediator. Ischemic PC, SNAP, or SNP caused a significant increase in cGMP and a reduction in cAMP levels after 25 min of sustained ischemia that may contribute to the protection obtained. The results obtained suggest a role for NO (and cGMP) as a trigger in classic PC.
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Affiliation(s)
- A Lochner
- Medical Physiology and Biochemistry, Faculty of Medicine, University of Stellenbosch, Tygerberg 7505, Republic of South Africa.
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Hobom M, Dai S, Marais E, Lacinova L, Hofmann F, Klugbauer N. Neuronal distribution and functional characterization of the calcium channel alpha2delta-2 subunit. Eur J Neurosci 2000; 12:1217-26. [PMID: 10762351 DOI: 10.1046/j.1460-9568.2000.01009.x] [Citation(s) in RCA: 88] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The auxiliary calcium channel alpha2delta subunit comprises a family of three genes, alpha2delta-1 to 3, which are expressed in a tissue-specific manner. alpha2delta-2 mRNA is found in the heart, skeletal muscle, brain, kidney, liver and pancreas. We report here for the first time the identification and functional characterization of alpha2delta-2 splice variants and their mRNA distribution in the mouse brain. The splice variants differ in the alpha2 and delta protein by eight and three amino acid residues, respectively, and are differentially expressed in cardiac tissue and human medullary thyroid carcinoma (hMTC) cells. In situ hybridization of mouse brain sections revealed the highest expression of alpha2delta-2 mRNA in the Purkinje cell layer of the cerebellum, habenulae and septal nuclei, and a lower expression in the cerebral cortex, olfactory bulb, thalamic and hypothalamic nuclei, as well as the inferior and superior colliculus. As the in situ data did not suggest a specific colocalization with any alpha1 subunit, coexpression studies of alpha2delta-2 were carried out either with the high-voltage-gated calcium channels, alpha1C, alpha1E or alpha1A, or with the low-voltage-gated calcium channel, alpha1G. Coexpression of alpha2delta-2 increased the current density, shifted the voltage dependence of channel activation and inactivation of alpha1C, alpha1E and alpha1A subunits in a hyperpolarizing direction, and accelerated the decay and shifted the steady-state inactivation of the alpha1G current.
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MESH Headings
- Alternative Splicing/physiology
- Animals
- Blotting, Northern
- Calcium Channels, L-Type/analysis
- Calcium Channels, L-Type/genetics
- Calcium Channels, L-Type/metabolism
- Calcium Channels, T-Type/analysis
- Calcium Channels, T-Type/genetics
- Calcium Channels, T-Type/metabolism
- Cell Line
- Cloning, Molecular
- DNA, Complementary
- Electrophysiology
- Gene Expression/physiology
- Humans
- In Situ Hybridization
- Ion Channel Gating/physiology
- Kidney/cytology
- Membrane Potentials/physiology
- Mice
- Neurons/chemistry
- Neurons/physiology
- RNA, Messenger/analysis
- Transfection
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Affiliation(s)
- M Hobom
- Institut für Pharmakologie und Toxikologie der Technischen Universität München, Germany
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29
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Abstract
The gamma subunit was initially identified as an auxiliary subunit of the skeletal muscle calcium channel complex. Evidence for the existence of further gamma subunits arose following the characterization of a genetic defect that induces epileptic seizures in stargazer mice. We present here the first account of a family of at least five putative gamma subunits that are predominantly expressed in brain. The gamma-2 and gamma-4 subunits shift the steady-state inactivation curve to more hyperpolarized potentials upon coexpression with the P/Q type alpha(1A) subunit. The coexpression of the gamma-5 subunit accelerates the time course of current activation and inactivation of the alpha(1G) T-type calcium channel.
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Affiliation(s)
- N Klugbauer
- Institut für Pharmakologie und Toxikologie der Technischen Universität München, Biedersteiner Str. 29, 80802, Munich, Germany.
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Abstract
A member of the low-voltage-activated calcium channel family was identified in mouse brain by taking advantage of amino acid sequences that have been evolutionary conserved. The identified sequence is similar to that of the recently cloned rat alpha1G T-type calcium channel, but there are differences in two insertions in the intracellular connecting loops. Northern blot analysis indicates that its expression is strong in the brain. In situ hybridization revealed that, in mouse brain, the alpha1G mRNA is found in the cerebellum, hippocampus, thalamus and olfactory bulb. In contrast to L-type calcium channel currents, IBa and ICa through the alpha1G channel expressed in HEK293 cells did not differ in terms of current density, voltage dependence of current activation, inactivation and deactivation, and speed of recovery from voltage-dependent inactivation. The kinetics of ICa inactivation were significantly slower than those of IBa. The expressed alpha1G channel has a relatively high sensitivity to mibefradil, but is only slightly affected by Ni2+.
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Affiliation(s)
- N Klugbauer
- Institut für Pharmakologie und Toxikologie der Technischen Universität München, Biedersteiner Str. 29, D-80802 Munich, Germany.
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Klugbauer N, Lacinová L, Marais E, Hobom M, Hofmann F. Molecular diversity of the calcium channel alpha2delta subunit. J Neurosci 1999; 19:684-91. [PMID: 9880589 PMCID: PMC6782206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023] Open
Abstract
Sequence database searches with the alpha2delta subunit as probe led to the identification of two new genes encoding proteins with the essential properties of this calcium channel subunit. Primary structure comparisons revealed that the novel alpha2delta-2 and alpha2delta-3 subunits share 55.6 and 30.3% identity with the alpha2delta-1 subunit, respectively. The number of putative glycosylation sites and cysteine residues, hydropathicity profiles, and electrophysiological character of the alpha2delta-3 subunit indicates that these proteins are functional calcium channel subunits. Coexpression of alpha2delta-3 with alpha1C and cardiac beta2a or alpha1E and beta3 subunits shifted the voltage dependence of channel activation and inactivation in a hyperpolarizing direction and accelerated the kinetics of current inactivation. The kinetics of current activation were altered only when alpha2delta-1 or alpha2delta-3 was expressed with alpha1C. The effects of alpha2delta-3 on alpha1C but not alpha1E are indistinguishable from the effects of alpha2delta-1. Using Northern blot analysis, it was shown that alpha2delta-3 is expressed exclusively in brain, whereas alpha2delta-2 is found in several tissues. In situ hybridization of mouse brain sections showed mRNA expression of alpha2delta-1 and alpha2delta-3 in the hippocampus, cerebellum, and cortex, with alpha2delta-1 strongly detected in the olfactory bulb and alpha2delta-3 in the caudate putamen.
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Affiliation(s)
- N Klugbauer
- Institut für Pharmakologie und Toxikologie der Technischen Universität München, 80802 München, Germany
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Stein DJ, Laszlo B, Marais E, Seedat S, Potocnik F. Hoarding symptoms in patients on a geriatric psychiatry inpatient unit. S Afr Med J 1997; 87:1138-40. [PMID: 9358832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND While collecting may be a normal behaviour, hoarding is a symptom of various psychiatric disorders, including obsessive-compulsive disorder (OCD) and obsessive-compulsive personality disorder (OCPD). Although anecdotal reports suggest that hoarding is not uncommon in geriatric psychiatry populations, its psychopathological correlates in such samples have not been well characterised. METHODS The presence of clinically significant hoarding symptoms was screened for in 100 consecutive patients in a geriatric psychiatry inpatient unit. Both patient and collateral histories were obtained. When hoarding symptoms were present, a detailed history of their phenomenology was obtained by means of a structured questionnaire and the response of hoarding symptoms to treatment during hospitalisation was monitored. RESULTS Clinically significant hoarding was found in 5/100 subjects. Four of these 5 patients met DSM-IV criteria for schizophrenia (paranoid subtype), with onset of symptoms coinciding with increased symptoms of dementia. The fifth patient met criteria for bipolar disorder (manic episode), also had symptoms of dementia, and had a lifelong history of hoarding. Hoarding behaviours responded to antipsychotic treatment in 3 of the 5 patients. CONCLUSIONS A history of hoarding may be useful in many psychiatric patients, but psychopathological correlates of this symptom are likely to vary with age. In a geriatric psychiatry inpatient population hoarding was associated not with OCD or OCPD, but rather with paranoid schizophrenia and increasing symptoms of dementia. Dopamine blockers appeared useful in decreasing hoarding in some patients, raising interesting questions about the neurobiology of this symptom.
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Affiliation(s)
- D J Stein
- Department of Psychiatry, University of Stellenbosch, Tygerberg, W, Cape
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Abstract
This study involved DNA analysis of bone marrow cells of 15 patients with megaloblastic anaemia. The diagnosis was based on the morphological changes seen in the bone marrow, associated with either a low red cell folate or serum vitamin B12 level and an adequate response to appropriate therapy as confirmation of the diagnosis. Flow cytometric DNA analysis showed an increase in the S and G2 phases of the cell cycle, but conventional agarose gel electrophoretic DNA analysis did not confirm the characteristic 'ladder pattern' which might have been expected in classic apoptosis. In addition, cells showing morphological changes suggestive of apoptosis, such as nuclear condensation and fragmentation, did not show evidence of DNA fragmentation using the ApopTag in situ digoxigenin nucleotide labelled, peroxidase detection system. Further studies using annexin V flow cytometric analysis and pulsed field gel electrophoresis were also unable to detect evidence of apoptosis as a significant cause of cell death in megaloblastic anaemia.
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Affiliation(s)
- C F Ingram
- Department of Haematology, School of Pathology, South African Institute for Medical Research and the University of the Witwatersrand, Johannesburg
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Marais E. Play aids for the handicapped: children - safely - at play. Nurs Mirror 1980; 150:26-7. [PMID: 6444716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Marais E. Learning while living in hospital. Nurs Times 1978; 74:1156-7. [PMID: 248708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Marais E. Learning about the world. Nurs Times 1968; 64:769-71. [PMID: 5651841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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