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Mukkamalla SKR, Sreekanth D, Reddy GG, Rao HU, Krishna PSR. A Rare Case of Solitary Osteochondroma of Right Hip with Unusual Clinical Presentation. J Orthop Case Rep 2023; 13:129-132. [PMID: 38025372 PMCID: PMC10664216 DOI: 10.13107/jocr.2023.v13.i11.4032] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 09/13/2023] [Indexed: 12/01/2023] Open
Abstract
Introduction Osteochondroma is the most common primary benign tumor and developmental osseous anomaly resulting in exophytic overgrowth on the surface of bone lined by hyaline cartilage cap. In morphological view, they are sessile or pedunculated forms most commonly occurring in hip, scapula, humerus, and rarely, clavicle. X-ray, MRI angiogram are useful to know the bony, vascular pathology and histopathological investigation is the gold standard investigation to confirm the diagnosis. Case Report A 30-year-old male patient presented to our department with pain and swelling over the right gluteal region followed by difficulty in walking in the past 3 months. On clinical and radiological examination, we observed the findings suggestive of osteochondroma, the patient was planned for excisional biopsy, and the material sent to histopathological examination which confirmed as osteochondroma. Conclusion Early diagnosis and excision of tumor prevent functional disability and malignant transformation and improve the life expectancy.
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Affiliation(s)
| | - Damagatla Sreekanth
- Department of Orthopaedics, Viswabharathi Medical College, Kurnool, Andhra Pradesh, India
| | - G Gnanendra Reddy
- Department of Orthopaedics, Viswabharathi Medical College, Kurnool, Andhra Pradesh, India
| | - H Umanath Rao
- Department of Orthopaedics, Viswabharathi Medical College, Kurnool, Andhra Pradesh, India
| | - P Siva Rama Krishna
- Department of Orthopaedics, Viswabharathi Medical College, Kurnool, Andhra Pradesh, India
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2
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Hsiao YC, Hung YH, Horng YJ, Chang CW. Antimicrobial effects of automobile screenwashes against Legionella pneumophila. J Appl Microbiol 2022; 133:3596-3604. [PMID: 36000381 DOI: 10.1111/jam.15793] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Revised: 08/17/2022] [Accepted: 08/20/2022] [Indexed: 11/27/2022]
Abstract
AIMS Legionella pneumophila (Lp), a human pathogen, has been detected in windscreen wiper fluid reservoirs (WWFRs) where commercial screenwashes (CSWs) are commonly added. Limited information is available on CSWs against planktonic Lp; however, responses of sessile Lp and planktonic Lp pre-acclimated in nutrient-limited water to CSWs remain unknown. This study thus investigates the antibacterial effects of CSWs on sessile and starved planktonic Lp, in comparison with unstarved Lp. METHODS AND RESULTS Lp biofilms were produced on glass and WWFR materials of high-density polyethylene (HDPE) and polypropylene (PP). Planktonic Lp with and without acclimation in tap water were prepared. Log reductions in cell counts averaged 0.4-5.0 for ten brands of CSWs against sessile Lp and 1.0-3.9 and 0.9-4.9, respectively, against starved and unstarved planktonic Lp for five CSWs. Both biofilm formation and acclimation in tap water enhanced Lp resistance to CSWs. Significantly different log-reduction values among CSW brands were observed for sessile Lp on HDPE and planktonic Lp regardless of acclimation (p<0.05). CONCLUSIONS Biofilm formation, starvation acclimation, and CSW brand are crucial factors influencing Lp response to CSWs. SIGNIFICANCE AND IMPACT OF STUDY This study advances the knowledge of Lp reaction in anthropogenic water systems with CSWs.
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Affiliation(s)
- Yun-Chung Hsiao
- Department of Public Health, National Taiwan University, Taiwan
| | - Yu-Hsin Hung
- Department of Public Health, National Taiwan University, Taiwan
| | - Yu-Ju Horng
- Institute of Environmental and Occupational Health Sciences, National Taiwan University, Taiwan
| | - Ching-Wen Chang
- Department of Public Health, National Taiwan University, Taiwan.,Institute of Environmental and Occupational Health Sciences, National Taiwan University, Taiwan
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3
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Lahiri D, Nag M, Banerjee R, Mukherjee D, Garai S, Sarkar T, Dey A, Sheikh HI, Pathak SK, Edinur HA, Pati S, Ray RR. Amylases: Biofilm Inducer or Biofilm Inhibitor? Front Cell Infect Microbiol 2021; 11:660048. [PMID: 33987107 PMCID: PMC8112260 DOI: 10.3389/fcimb.2021.660048] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [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: 01/28/2021] [Accepted: 04/12/2021] [Indexed: 12/30/2022] Open
Abstract
Biofilm is a syntrophic association of sessile groups of microbial cells that adhere to biotic and abiotic surfaces with the help of pili and extracellular polymeric substances (EPS). EPSs also prevent penetration of antimicrobials/antibiotics into the sessile groups of cells. Hence, methods and agents to avoid or remove biofilms are urgently needed. Enzymes play important roles in the removal of biofilm in natural environments and may be promising agents for this purpose. As the major component of the EPS is polysaccharide, amylase has inhibited EPS by preventing the adherence of the microbial cells, thus making amylase a suitable antimicrobial agent. On the other hand, salivary amylase binds to amylase-binding protein of plaque-forming Streptococci and initiates the formation of biofilm. This review investigates the contradictory actions and microbe-associated genes of amylases, with emphasis on their structural and functional characteristics.
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Affiliation(s)
- Dibyajit Lahiri
- Department of Biotechnology, University of Engineering & Management, Kolkata, India
| | - Moupriya Nag
- Department of Biotechnology, University of Engineering & Management, Kolkata, India
| | - Ritwik Banerjee
- Department of Biotechnology, University of Engineering & Management, Kolkata, India
| | - Dipro Mukherjee
- Department of Biotechnology, University of Engineering & Management, Kolkata, India
| | - Sayantani Garai
- Department of Biotechnology, University of Engineering & Management, Kolkata, India
| | - Tanmay Sarkar
- Department of Food Technology and Bio-Chemical Engineering, Jadavpur University, Kolkata, India.,Malda Polytechnic, West Bengal State Council of Technical Education, Government of West Bengal, Malda, India
| | - Ankita Dey
- Department of Biotechnology, Maulana Abul Kalam Azad University of Technology, Haringhata, India
| | - Hassan I Sheikh
- Faculty of Fisheries and Food Science, Universiti Malaysia Terengganu, Kuala Nerus, Malaysia
| | - Sushil Kumar Pathak
- Department of Bioscience and Bioinformatics, Khallikote University, Berhampur, India
| | | | - Siddhartha Pati
- Centre of Excellence, Khallikote University, Berhampur, India.,Research Division, Association for Biodiversity Conservation and Research (ABC), Balasore, India
| | - Rina Rani Ray
- Department of Biotechnology, Maulana Abul Kalam Azad University of Technology, Haringhata, India
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4
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Abstract
Population-level scaling in ecological systems arises from individual growth and death with competitive constraints. We build on a minimal dynamical model of metabolic growth where the tension between individual growth and mortality determines population size distribution. We then separately include resource competition based on shared capture area. By varying rates of growth, death, and competitive attrition, we connect regular and random spatial patterns across sessile organisms from forests to ants, termites, and fairy circles. Then, we consider transient temporal dynamics in the context of asymmetric competition, such as canopy shading or large colony dominance, whose effects primarily weaken the smaller of two competitors. When such competition couples slow timescales of growth to fast competitive death, it generates population shocks and demographic oscillations similar to those observed in forest data. Our minimal quantitative theory unifies spatiotemporal patterns across sessile organisms through local competition mediated by the laws of metabolic growth, which in turn, are the result of long-term evolutionary dynamics.
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5
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Liu HY, Chen YT, Huang SC, Wang HJ, Cheng YT, Kang CH, Lee WC, Su YL, Huang CC, Chang YL, Chuang YC, Luo HL, Chiang PH. The Prognostic Impact of Tumor Architecture for Upper Urinary Tract Urothelial Carcinoma: A Propensity Score-Weighted Analysis. Front Oncol 2021; 11:613696. [PMID: 33718167 PMCID: PMC7947797 DOI: 10.3389/fonc.2021.613696] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [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: 10/03/2020] [Accepted: 01/04/2021] [Indexed: 12/28/2022] Open
Abstract
Purpose To assess the association of tumor architecture with cancer recurrence, metastasis, and cancer-specific survival (CSS) in patients treated with radical nephroureterectomy (RNU) for upper urinary tract urothelial carcinoma (UTUC) in Taiwan. Materials and Methods Data were collected from 857 patients treated with RNU between January 2005 and August 2016 in our hospital. Pathologic slides were reviewed by genitourinary pathologists. Propensity score weighting was performed for data analysis. Results Sessile growth pattern was observed in 212 patients (24.7%). Tumor architecture exhibited a significant association with bladder cancer history, chronic kidney disease (CKD), tumor stage, lymph node status, histological grade, lymphovascular invasion, concomitant carcinoma in situ, and the variant type [standardized mean difference (SMD) > 0.1 for all variables before weighting]. In the propensity score analysis, 424 papillary and sessile tumor architecture were analyzed to balance the baseline characteristics between the groups. Tumor architecture was an independent predictor of metastatic disease and CSS (p = 0.033 and p = 0.002, respectively). However, the associations of tumor architecture with bladder and contralateral recurrence were nonsignificant (p = 0.956 and p = 0.844, respectively). Conclusions Tumor architecture of UTUC after RNU is associated with established features of aggressive disease and predictors of metastasis and CSS. Assessment of tumor architecture may help identify patients who could benefit from close follow-up or early administration of systemic therapy after RNU. Tumor architecture should be included in UTUC staging after further confirmation.
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Affiliation(s)
- Hui-Ying Liu
- Department of Urology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Yen Ta Chen
- Department of Urology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Shun-Chen Huang
- Department of Pathology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Hung-Jen Wang
- Department of Urology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Yuan-Tso Cheng
- Department of Urology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Chih Hsiung Kang
- Department of Urology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Wei Ching Lee
- Department of Urology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Yu-Li Su
- Department of Hematology and Oncology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Chun-Chieh Huang
- Department of Radiation Oncology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Yin-Lun Chang
- Department of Urology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Yao-Chi Chuang
- Department of Urology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Hao Lun Luo
- Department of Urology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Po Hui Chiang
- Department of Urology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
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Abstract
Aerosol droplets play a critical role in the development of weather patterns, yet are notoriously difficult to analyze because of their small size, transient nature and potentially complex composition. As a result, there has been a surge in recent years in the development of analysis techniques aimed at the study of aerosol droplets, namely of their surface tension properties, which are thought to play a great role in aerosol/cloud growth and subsequently having an impact on the resulting weather patterns. To capture the state of the field at this key time, we have collected and described some of the most relevant and influential studies, with a focus on those that have had the most impact. This review will present and describe the most used analytical techniques for studying the surface tension of micrometer-sized aqueous droplets, with a focus on historical trends and how the current techniques are posed to revolutionize the field.
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Affiliation(s)
- Derrick M Mott
- Institute of Multidisciplinary Research for Advanced Material (IMRAM), Tohoku University, IMRAM West Building 1, Room S211, 2-1-1 Katahira, Aoba, Sendai, 980-8577, Japan
| | - Mao Fukuyama
- Institute of Multidisciplinary Research for Advanced Material (IMRAM), Tohoku University, IMRAM West Building 1, Room S211, 2-1-1 Katahira, Aoba, Sendai, 980-8577, Japan
| | - Akihide Hibara
- Institute of Multidisciplinary Research for Advanced Material (IMRAM), Tohoku University, IMRAM West Building 1, Room S211, 2-1-1 Katahira, Aoba, Sendai, 980-8577, Japan.
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7
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Brown PD, Walsh EJ. Genome size and lifestyle in gnesiotrochan rotifers. Hydrobiologia 2019; 844:105-115. [PMID: 31798186 PMCID: PMC6886742 DOI: 10.1007/s10750-018-3873-8] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2018] [Revised: 11/30/2018] [Accepted: 12/20/2018] [Indexed: 06/10/2023]
Abstract
Gnesiotrochan rotifers display a variety of life styles ranging from taxa with free-swimming larval and sessile adult stages to those with motile adult stages and colonial habits. Several explanations for the C- value enigma posits that genome size is correlated with lifestyle. To investigate this, 13 gnesiotrochan species representing nine genera were measured by flow cytometry. Genome sizes (1C) within Gnesiotrocha ranged from 0.05 pg (Hexarthra mira and Hexarthra fennica) to 0.25 pg (Sinantherina ariprepes). Genome sizes varied within genera and species; e.g., H. fennica (El Huérfano, Mexico) was estimated to be 15% larger than that of H. mira and H. fennica (Keystone Wetland, TX, USA). Gnesiotrochan genome sizes are similar to those reported within Ploima, which range from 0.06 pg (Brachionus rotundiformis, B. dimidiatus) to 0.46 pg (B. asplanchnoidis). Within Gnesiotrocha, genome size was found to be significantly smaller in sessile versus motile species as well as in solitary versus colonial species. To account for phylogenetic background, Linear Mixed Models with hierarchical taxonomic ranks showed that there is a taxonomic component underlying genome size. This study provides the first estimates of genome size within the superorder, providing a baseline for genomic and evolutionary studies within the group.
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Affiliation(s)
- Patrick D Brown
- Department of Biological Sciences, University of Texas at El Paso, 500 West University Avenue, El Paso, Texas, USA 79968.
| | - Elizabeth J Walsh
- Department of Biological Sciences, University of Texas at El Paso, 500 West University Avenue, El Paso, Texas, USA 79968.
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8
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Bottagisio M, Soggiu A, Piras C, Bidossi A, Greco V, Pieroni L, Bonizzi L, Roncada P, Lovati AB. Proteomic Analysis Reveals a Biofilm-Like Behavior of Planktonic Aggregates of Staphylococcus epidermidis Grown Under Environmental Pressure/Stress. Front Microbiol 2019; 10:1909. [PMID: 31551940 PMCID: PMC6743020 DOI: 10.3389/fmicb.2019.01909] [Citation(s) in RCA: 7] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Accepted: 08/05/2019] [Indexed: 01/14/2023] Open
Abstract
Prosthetic joint replacement failure has a huge impact on quality of life and hospitalization costs. A leading cause of prosthetic joint infection is bacteria-forming biofilm on the surface of orthopedic devices. Staphylococcus epidermidis is an emergent, low-virulence pathogen implicated in chronic infections, barely indistinguishable from aseptic loosening when embedded in a mature matrix. The literature on the behavior of quiescent S. epidermidis in mature biofilms is scarce. To fill this gap, we performed comparative analysis of the whole proteomic profiles of two methicillin-resistant S. epidermidis strains growing in planktonic and in sessile form to investigate the molecular mechanisms underlying biofilm stability. After 72-h culture of biofilm-forming S. epidermidis, overexpression of proteins involved in the synthesis of nucleoside triphosphate and polysaccharides was observed, whereas planktonic bacteria expressed proteins linked to stress and anaerobic growth. Cytological analysis was performed to determine why planktonic bacteria unexpectedly expressed proteins typical of sessile culture. Images evidenced that prolonged culture under vigorous agitation can create a stressful growing environment that triggers microorganism aggregation in a biofilm-like matrix as a mechanism to survive harsh conditions. The choice of a unique late time point provided an important clue for future investigations into the biofilm-like behavior of planktonic cells. Our preliminary results may inform comparative proteomic strategies in the study of mature bacterial biofilm. Finally, there is an increasing number of studies on the aggregation of free-floating bacteria embedded in an extracellular matrix, prompting the need to gain further insight into this mode of bacterial growth.
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Affiliation(s)
- Marta Bottagisio
- IRCCS Istituto Ortopedico Galeazzi, Laboratory of Clinical Chemistry and Microbiology, Milan, Italy
| | - Alessio Soggiu
- Department of Veterinary Medicine (DiMeVet), University of Milan, Milan, Italy
| | - Cristian Piras
- Department of Veterinary Medicine (DiMeVet), University of Milan, Milan, Italy
| | - Alessandro Bidossi
- IRCCS Istituto Ortopedico Galeazzi, Laboratory of Clinical Chemistry and Microbiology, Milan, Italy
| | - Viviana Greco
- Institute of Biochemistry and Clinical Biochemistry, Università Cattolica del Sacro Cuore Roma, Rome, Italy.,Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome, Italy
| | - Luisa Pieroni
- Proteomics and Metabonomics Unit, IRCCS Fondazione Santa Lucia, Rome, Italy
| | - Luigi Bonizzi
- Department of Veterinary Medicine (DiMeVet), University of Milan, Milan, Italy
| | - Paola Roncada
- Department of Health Sciences, Università degli Studi "Magna Græcia", Catanzaro, Italy
| | - Arianna B Lovati
- IRCCS Istituto Ortopedico Galeazzi, Cell and Tissue Engineering Laboratory, Milan, Italy
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9
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Anderson JM, Moore IN, Nagata BM, Ribeiro JMC, Valenzuela JG, Sonenshine DE. Ticks, Ixodes scapularis, Feed Repeatedly on White-Footed Mice despite Strong Inflammatory Response: An Expanding Paradigm for Understanding Tick-Host Interactions. Front Immunol 2017; 8:1784. [PMID: 29326693 PMCID: PMC5741700 DOI: 10.3389/fimmu.2017.01784] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [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: 09/07/2017] [Accepted: 11/29/2017] [Indexed: 12/12/2022] Open
Abstract
Ticks transmit infectious agents including bacteria, viruses and protozoa. However, their transmission may be compromised by host resistance to repeated tick feeding. Increasing host resistance to repeated tick bites is well known in laboratory animals, including intense inflammation at the bite sites. However, it is not known whether this also occurs in wild rodents such as white-footed mice, Peromyscus leucopus, and other wildlife, or if it occurs at all. According to the “host immune incompetence” hypothesis, if these mice do not have a strong inflammatory response, they would not reject repeated tick bites by Ixodes scapularis. To test this hypothesis, histopathological studies were done comparing dermal inflammation in P. leucopus versus guinea pigs, Cavia porcellus, repeatedly infested with I. scapularis. In P. leucopus, the immune cell composition was like that seen in laboratory mouse models, with some differences. However, there was a broad sessile lesion with intact dermal architecture, likely enabling the ticks to continue feeding unimpeded. In contrast, in C. porcellus, there was a relatively similar mixed cellular profile, but there also was a large, leukocyte-filled cavitary lesion and scab-like hyperkeratotic changes to the epidermal layer, along with itching and apparent pain. Ticks attached to sensitized C. porcellus fed poorly or were dislodged, presumably due to the weakened anchoring of the tick’s mouthparts cemented in the heavily inflamed and disintegrating dermal tissues. This is the first time that the architecture of the skin lesions has been recognized as a major factor in understanding tick–host tolerance versus tick bite rejection. These findings broadly strengthen previous work done on lab animal models but also help explain why I. scapularis can repeatedly parasitize white-footed mice, supporting the “immune evasion theory” but cannot repeatedly parasitize other, non-permissive hosts such as guinea pigs.
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Affiliation(s)
- Jennifer M Anderson
- Vector Biology Section, Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases (NIH), Rockville, MD, United States
| | - Ian N Moore
- Infectious Disease and Pathogenesis Section, Comparative Medicine Branch, National Institute of Allergy and Infectious Diseases (NIH), Rockville, MD, United States
| | - Bianca M Nagata
- Infectious Disease and Pathogenesis Section, Comparative Medicine Branch, National Institute of Allergy and Infectious Diseases (NIH), Rockville, MD, United States
| | - José M C Ribeiro
- Vector Biology Section, Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases (NIH), Rockville, MD, United States
| | - Jesus G Valenzuela
- Vector Molecular Biology Section, Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases (NIH), Rockville, MD, United States
| | - Daniel E Sonenshine
- Vector Biology Section, Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases (NIH), Rockville, MD, United States.,Department of Biological Sciences, Old Dominion University, Norfolk, VA, United States
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10
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Bayramoglu B, Toubiana D, Gillor O. Genome-wide transcription profiling of aerobic and anaerobic Escherichia coli biofilm and planktonic cultures. FEMS Microbiol Lett 2017; 364:fnx006. [PMID: 28087619 DOI: 10.1093/femsle/fnx006] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/11/2017] [Indexed: 11/13/2022] Open
Abstract
Many studies have described the response of the facultative anaerobe, Escherichia coli, to anaerobic conditions, yet they all investigated free-living (planktonic) cells because attempts to cultivate anaerobic E. coli biofilm were mostly unsuccessful. We challenged these findings and cultivated E. coli strain MG1655 biofilm under both aerobic and anaerobic conditions, characterizing the mature biofilm architecture and global gene expression profile. We used RNA sequencing technology to compare stationary phase planktonic cells with mature biofilm, cultured with and without oxygen. Our results suggest that gene expression patterns significantly differ between biofilm and planktonic cultures cultivated under the same oxygenic conditions. The anaerobic E. coli biofilms were slow growing and patchy compared to aerobic biofilms, yet some features were unchanged like the production of extracellular polymeric substances. A closer inspection of the mRNA data revealed that essential cell processes were attenuated in anaerobic biofilms, including protein synthesis, information transfer, cell structure, regulation and transport. Our results suggest that lack of oxygen imposes severe stress on mature biofilms thus limiting the cells' activity. We further propose that E. coli does not favor growing in anaerobic biofilms and when forced to do so, the cells prevail by attenuating their activity in order to survive.
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11
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Chang CY, Marshall DJ. Spatial pattern of distribution of marine invertebrates within a subtidal community: do communities vary more among patches or plots? Ecol Evol 2016; 6:8330-8337. [PMID: 27878099 PMCID: PMC5108281 DOI: 10.1002/ece3.2462] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [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: 03/22/2016] [Revised: 08/01/2016] [Accepted: 08/12/2016] [Indexed: 11/26/2022] Open
Abstract
Making links between ecological processes and the scales at which they operate is an enduring challenge of community ecology. Our understanding of ecological communities cannot advance if we do not distinguish larger scale processes from smaller ones. Variability at small spatial scales can be important because it carries information about biological interactions, which cannot be explained by environmental heterogeneity alone. Marine fouling communities are shaped by both the supply of larvae and competition for resources among colonizers—these two processes operate on distinctly different scales. Here, we demonstrate how fouling community structure varies with spatial scale in a temperate Australian environment, and we identify the spatial scale that captures the most variability. Community structure was quantified with both univariate (species richness and diversity) and multivariate (similarity in species composition) indices. Variation in community structure was unevenly distributed between the spatial scales that we examined. While variation in community structure within patch was usually greater than among patch, variation among patch was always significant. Opportunistic taxa that rely heavily on rapid colonization of free space spread more evenly among patches during early succession. In contrast, taxa that are strong adult competitors but slow colonizers spread more evenly among patches only during late succession. Our findings show significant patchiness can develop in a habitat showing no systematic environmental spatial variation, and this patchiness can be mediated through different biological factors at different spatial scales.
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Affiliation(s)
- Chun-Yi Chang
- Centre for Geometric Biology/School of Biological Sciences Monash University Clayton Vic. Australia
| | - Dustin J Marshall
- Centre for Geometric Biology/School of Biological Sciences Monash University Clayton Vic. Australia
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12
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Ushiama S, Smith JA, Suthers IM, Lowry M, Johnston EL. The effects of substratum material and surface orientation on the developing epibenthic community on a designed artificial reef. Biofouling 2016; 32:1049-1060. [PMID: 27626597 DOI: 10.1080/08927014.2016.1224860] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [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: 02/02/2016] [Accepted: 08/08/2016] [Indexed: 06/06/2023]
Abstract
Artificial reefs provide shelter and can be an important source of food for fish depending on the epibenthic community on the structure. The growth and diversity of this community is influenced by the substratum material and the surface orientation of the reef. Settlement plates of four materials (Perspex, sandstone, wood and steel) were deployed in three orientations (upwards, downwards and vertical) at a depth of 33 m on a designed artificial reef (DAR) off the coast of Sydney, Australia. After three months, the steel surfaces had lower invertebrate species richness, total abundance and diversity compared to other surfaces. Steel was not an ideal material for the initial recruitment and growth of epibenthic invertebrates. A longer duration would be required to develop a mature epibenthic community. Surface orientation had species-specific impacts. Surface material and orientation are important factors for developing epibenthic assemblages, and are thus likely to affect the broader artificial reef assemblage, including fish.
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Affiliation(s)
- Shinjiro Ushiama
- a Evolution and Ecology Research Centre, School of Biological, Earth and Environmental Sciences , University of New South Wales , Sydney , Australia
| | - James A Smith
- a Evolution and Ecology Research Centre, School of Biological, Earth and Environmental Sciences , University of New South Wales , Sydney , Australia
| | - Iain M Suthers
- a Evolution and Ecology Research Centre, School of Biological, Earth and Environmental Sciences , University of New South Wales , Sydney , Australia
| | - Michael Lowry
- b Wild Fisheries Research Division , NSW Department of Primary Industries (Port Stephens Fisheries Institute) , Port Stephens , Australia
| | - Emma L Johnston
- a Evolution and Ecology Research Centre, School of Biological, Earth and Environmental Sciences , University of New South Wales , Sydney , Australia
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13
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Crowther GS, Chilton CH, Todhunter SL, Nicholson S, Freeman J, Baines SD, Wilcox MH. Comparison of planktonic and biofilm-associated communities of Clostridium difficile and indigenous gut microbiota in a triple-stage chemostat gut model. J Antimicrob Chemother 2014; 69:2137-47. [PMID: 24788662 DOI: 10.1093/jac/dku116] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
BACKGROUND Biofilms are characteristic of some chronic or recurrent infections and this mode of growth tends to reduce treatment efficacy. Clostridium difficile infection (CDI) is associated with a high rate of recurrent symptomatic disease. The presence and behaviour of C. difficile within intestinal biofilms remains largely unexplored, but may factor in recurrent infection. METHODS A triple-stage chemostat gut model designed to facilitate the formation of intestinal biofilm was inoculated with a pooled human faecal emulsion. Bacterial populations were allowed to equilibrate before simulated CDI was induced by clindamycin (33.9 mg/L, four times daily, 7 days) and subsequently treated with vancomycin (125 mg/L, four times daily, 7 days). Indigenous gut microbiota, C. difficile total viable counts, spores, cytotoxin and antimicrobial activity in planktonic and biofilm communities were monitored during the 10 week experimental period. RESULTS Vancomycin successfully treated the initial episode of simulated CDI, but ∼18 days after therapy cessation, recurrent infection occurred. Germination, proliferation and toxin production were evident within planktonic communities in both initial and recurrent CDI. In contrast, sessile C. difficile remained in dormant spore form for the duration of the experiment. The effects of and recovery from clindamycin and vancomycin exposure for sessile populations was delayed compared with responses for planktonic bacteria. CONCLUSIONS Intestinal biofilms provide a potential reservoir for C. difficile spore persistence, possibly facilitating their dispersal into the gut lumen after therapeutic intervention, leading to recurrent infection. Therapeutic options for CDI could have increased efficacy if they are more effective against sessile C. difficile.
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Affiliation(s)
- Grace S Crowther
- Leeds Institute of Biomedical and Clinical Sciences, Faculty of Medicine and Health, University of Leeds, Leeds LS2 9JT, UK
| | - Caroline H Chilton
- Leeds Institute of Biomedical and Clinical Sciences, Faculty of Medicine and Health, University of Leeds, Leeds LS2 9JT, UK
| | - Sharie L Todhunter
- Leeds Institute of Biomedical and Clinical Sciences, Faculty of Medicine and Health, University of Leeds, Leeds LS2 9JT, UK
| | - Scott Nicholson
- Leeds Institute of Biomedical and Clinical Sciences, Faculty of Medicine and Health, University of Leeds, Leeds LS2 9JT, UK
| | - Jane Freeman
- Department of Microbiology, Leeds Teaching Hospitals NHS Trust, The General Infirmary, Leeds LS1 3EX, UK
| | - Simon D Baines
- School of Life and Medical Sciences, Department of Human and Environmental Sciences, University of Hertfordshire, Hatfield AL10 9AB, UK
| | - Mark H Wilcox
- Leeds Institute of Biomedical and Clinical Sciences, Faculty of Medicine and Health, University of Leeds, Leeds LS2 9JT, UK Department of Microbiology, Leeds Teaching Hospitals NHS Trust, The General Infirmary, Leeds LS1 3EX, UK
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