Projects per year
Personal profile
Research Statement
IF YOU WANT TO KNOW MORE ABOUT MY RESEARCH AND MY STYLE PLEASE VISIT THE VALVANO LAB HOME PAGE http://publish.uwo.ca/~mvalvano/
THOSE INTERESTED IN JOING MY GROUP, PLEASE READ FIRST
http://publish.uwo.ca/~mvalvano/Advice-to-grads.html
Valvano Lab Mission Statement
- To carry out hypothesis-driven research in microbiology
- To train graduate students and postdoctoral fellows to become outstanding biomedical scientists
- To develop and foster an environment of scientific inquiry, and at the same time respect for each individual's expertise and contribution
- To place an emphasis on personal and scientific integrity and on team player skills
Achievements
- Fellow of the American Academy of Microbiology
- Visiting Professor, University of Pavia, Italy.
- Postgraduate Supervisory Excellence Award, The Graduate School, Queen's University Belfast
- Research contributions listed in the "51 Firsts (http://www.uwo.ca/research/51_firsts/), University of Western Ontario, 2015.
- Visiting Professor, Institute of Genetics and Microbiology, Wroclaw University, Poland
- Zeller Senior Scientist Award, in recognition to outstanding contributions to Cystic Fibrosis Canada as an established investigator
- Certificate of Recognition for outstanding service as an online mentor of the ASM Minority Mentorship Program, American Society for Microbiology. 2011
- Tier I Canada Research Chair in Infectious Diseases and Microbial Pathogenesis. 2009-2016 (resigned in 2012 to take Chair at Queen's University).
- Senior Scientist, Research Training Award, Canadian Cystic Fibrosis Foundation. 2009
- CSM/Roche/Murray Award, Canadian Society of Microbiologists, given to outstanding Canadian microbiologists.
- Dean’s Award of Excellence for outstanding contributions, Schulich School of Medicine and Dentistry, UWO. 2006
- Tier I Canada Research Chair in Infectious Diseases and Microbial Pathogenesis. 2002-2009
- Honour's Degree for Academic Excellence, School of Medicine, University of Buenos Aires (Academic Cumulative Average of 91.5 %)
Research Interests
What do we do?
Our research involves an interdisciplinary approach using molecular genetics, biochemistry, cell biology, and structural biology to understand the infection biology of opportunistic Gram-negative bacteria at molecular and cellular levels. Burkholderia, Enterobacter and Achromobacter species, are the primary model organisms we use in various aspects of our research program.
Our main goals are to elucidate how these opportunistic pathogens interact with innate immune cells (e.g., macrophage and epithelial cells) to promote or suppress inflammation, and the molecular basis of their extreme intrinsic resistance to antimicrobial agents, especially resistance to antimicrobial peptides and last resort antibiotics.
Why is it important?
Opportunistic infections pose a significant threat to human health, especially to those individuals who benefit most from advancements in the treatment of genetic diseases, cancer, and organ transplantation, but who become immunosuppressed.
Burkholderia cepacia complex bacteria (Bcc) and Achromobacter species are a major health risk for children and young adults with genetic conditions like cystic fibrosis and chronic granulomatous disease. These individuals commonly suffer from lung and airways infections that are very difficult to treat given the extraordinary resistance of these bacteria to clinically useful antimicrobials. Through our research, we hope to find novel ways to prevent or ameliorate the effect of these infections in susceptible individuals.
Enteric bacteria such as Enterobacter species are important opportunisitic multi drug resistant pathogens in the hospital setting. Very little is known about the infection biology of Enterobacter species despite these pathogens are a global health priority, as they are grouped within the ESKAPEE bacteria.
Lipopolysaccharide (LPS) is a complex glycolipid molecule located on the surface of Gram negative bacteria that is also a critical structural component of the bacterial outer membrane. Bacteria with defects in the LPS molecule are more sensitive to a variety of antibiotics and they can be easily killed by host defensive mechanisms such as the serum complement and antimicrobial peptides.
Therefore, by understanding how the LPS is made and assembled on the bacterial cell surface we hope to design inhibitors that will interfere with this process, which may be useful as novel antimicrobials. Also, we are looking at ways to alter LPS biosynthesis at various levels to increase the overall permeability of the outer membrane to antibiotics and antimicrobial peptides.
Examples of key questions we currently investigate
We discovered that genetic ablation of LPS synthesis or chemical inhibitors of certain LPS biosynthesis enzymes can "weaken" the bacterial outer membrane and facilitate the entry of conventional antibiotics and antimicrobial peptides, especially in B. cenocepacia and other Bcc bacteria. We have also conducted detailed studies on proteins required for the synthesis of core oligosaccharide and O antigen moieties of the LPS molecules. Now we want to learn:
We discovered that Bcc bacteria survive intracellularly in free-living amoebae and macrophages by altering the maturation of the phagosome, and this research has led to the hypothesis that these cells become a reservoir for the persistence and dissemination of these bacteria in the host. We have also discovered a novel secretory system in B. cenocepacia (T6SS) that secretes effectors altering the cytoskeleton of infected macrophages and is required for infection in an animal model of chronic lung infection. We want to learn:
Appropriate genetic tools are not always available for our specific research needs. Therefore, we place special effort in developing new tools and reagents or modifying those available to our own needs. Our lab has contributed novel molecular tools to handle Bcc bacteria and Achromobacter species.
We have recently discovered that Enterobacter species can survive in human macrophages without bacterial replication. We are therefore investigating:
How do Enterobacter species survive intracellularly?
How do macrophages respond to infection by Enterobacter?
What is the role of the highly active T6SS system in Enterobacter's ability to colonize the gut and other mucosal sites?
Teaching
CURRENT LAB MEMBERS
Postdoctoral Research Assistant
J. Monjaras Feria, 2017 -
P. Zarodkiewwicz, 2024 -
Post-Graduate Students
Primary Supervisor:
L. MacDonald, BSc, University of St. Andrews; PhD student, 2021 -.
H. Parks, BSc, Queen's University, PhD student, 2022 -.
A. Anderson, BSc, Queen's University, PhD student, 2021 -.
Second Supervisor:
B. Mullan, Queen's University (School of Pharmacy), PhD Student, 2024 -.
R. Miskimmin, Queen's University, PhD Student, 2023 -.
D. Lockwood, Queen's University, PhD Student, 2021 -.
P. Bendale, QUB School of Pharmacy, PhD student, 2021-24.
3rd Y Research Project Students
M. Mitchell, QUB, 2024-25
C. Beattie, QUB, 2024-25
Visiting Post-Graduate Students
N. Adade, PhD candidate, Univ. of Ghana, 2019-24
Over the years, I have trained more than 300 people. For a complete list of past lab alumni visit https://publish.uwo.ca/~mvalvano/past-labmembers.html
Expertise related to UN Sustainable Development Goals
In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This person’s work contributes towards the following SDG(s):
Fingerprint
- 1 Similar Profiles
-
R2959PMY: Covalent inhibitors of the bacterial enzyme ArnT as antimicrobial resistance breakers and novel diagnostic tools for multi-drug resistant infections
Wagner, G. (PI), Collins, B. (CoI) & Valvano, M. A. (CoI)
04/09/2023 → …
Project: Research
-
R2937PMY: Covalent inhibitors of the bacterial enzyme ArnT as antimicrobial resistance breakers and novel diagnostic tools for multi-drug resistant infections
Wagner, G. (PI), Collins, B. (CoI) & Valvano, M. A. (CoI)
11/11/2022 → …
Project: Research
-
R6629CEM: anti-Bacterial Innovative Vaccine Training Network
Valvano, M. A. (PI)
15/10/2019 → …
Project: Research
-
R1995CEM: Bacterial lipocalins: Novel role in bacterial protection against antibiotic-induced membrane lipid peroxidation
Valvano, M. A. (PI) & Lopez Campos, G. (CoI)
03/01/2019 → 31/03/2023
Project: Research
-
Clinical isolates of antimicrobial resistant Enterobacter species can persist in human macrophages without replication and overt cellular cytotoxicity
Parau, G., Parks, H. J., Anderson, A. J. G., Bisaro, F., Garcia Romero, I., Gilmore, M. C., Korankye, S. O., Marshall, H. & Valvano, M. A., 03 Mar 2025, (Early online date) In: The Journal of Infectious Diseases.Research output: Contribution to journal › Article › peer-review
Open Access -
Investigating bacterial invasion of highly differentiated human bronchial epithelial cell barriers
Parks, H. J. & Valvano, M. A., 12 Jun 2025, Dynamics of bacteria-mucus interactions. Brockhausen, I. (ed.). Springer, p. 93-102 10 p. (Methods in Molecular Biology; vol. 2942).Research output: Chapter in Book/Report/Conference proceeding › Chapter (peer-reviewed)
-
Stress adaptation under in vitro evolution influences survival and metabolic phenotypes of clinical and environmental strains of Vibrio cholerae El-Tor
Adade, N. E., Dela Ahator, S., García-Romero, I., Algarañás, M., Appiah , V., Valvano, M. A. & Duodu, S., Mar 2025, In: Microbiology Spectrum. 13, 3, 26 p., e01211-24.Research output: Contribution to journal › Article › peer-review
Open AccessFile5 Downloads (Pure) -
Drug efflux and lipid A modification by 4-L-aminoarabinose are key mechanisms of polymyxin B resistance in the sepsis pathogen Enterobacter bugandensis
García-Romero, I., Srivastava, M., Monjarás-Feria, J., Korankye, S. O., MacDonald, L., Scott, N. E. & Valvano, M. A., Jun 2024, In: Journal of Global Antimicrobial Resistance. 37, p. 108-121 14 p.Research output: Contribution to journal › Article › peer-review
Open AccessFile2 Citations (Scopus)44 Downloads (Pure) -
Phage treatment of Pseudomonas aeruginosa yields a phage-resistant population with different susceptibility to innate immune responses and mild effects on metabolic profiles
Tomasz, O., Augustyniak, D., Garcia Romero, I., Markwitz, P., Gula, G., Molinaro, A., Valvano, M. A. & Drulis-Kawa, Z., May 2024, In: Microbiological Research. 282, 127609.Research output: Contribution to journal › Article › peer-review
4 Citations (Scopus)
Datasets
-
ExtractMotifs package - R script designed to analyse data in a bind-n-seq strategy
An, S.-Q. (Contributor), Valvano, M. A. (Contributor), Yu, Y.-H. (Contributor), Webb, J. S. (Contributor) & Lopez Campos, G. (Creator), Queen's University Belfast, Mar 2020
DOI: 10.6084/m9.figshare.8058236, https://doi.org/10.6084/m9.figshare.8058236
Dataset
Prizes
-
Canadian Society of Microbiologists (Roche) Award
Valvano, M. A. (Recipient), 2008
Prize: Prize (including medals and awards)
-
Fellow of the American Academy of Microbiology
Valvano, M. A. (Recipient), 14 Feb 2025
Prize: Election to learned society
-
Member; Selection Committee for the Fundación Bunge y Born Award (Argentina).
Valvano, M. A. (Recipient), 2021
Prize: Appointment
-
Postgraduate Supervisory Excellence Award
Valvano, M. A. (Recipient), 2017
Prize: Prize (including medals and awards)
Activities
-
Intracellular survival of antibiotic-resistant clinical isolates of Enterobacter species in human macrophages with negligible cellular cytotoxicity; AMR Awareness Symposium, Maynooth University, Ireland.
Valvano, M. A. (Invited speaker)
11 Nov 2024Activity: Talk or presentation types › Invited or keynote talk at national or international conference
-
ESKAPE pathogens of Enterobacter species persist in human macrophages without eliciting pyroptosis; The Kenneth B. Fraser Symposium in Infection Biology, Wellcome-Wolfson Institute for Experimental Medicine, QUB.
Valvano, M. A. (Invited speaker)
07 Nov 2024Activity: Talk or presentation types › Invited talk
-
'Live and let die' - Lifestyles of opportunistic bacteria in human macrophages. CINDEFI-CONICET-CCT La Plata, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Buenos Aires, Argentina.
Valvano, M. A. (Invited speaker)
30 Oct 2024Activity: Talk or presentation types › Invited talk
-
"To kill or not to kill” - Opportunistic bacteria lifestyles in human macrophages; Department of Microbiology and Immunology, Western University, Canada.
Valvano, M. A. (Invited speaker)
12 Sept 2024Activity: Talk or presentation types › Invited talk
-
A tribute to Stefania Spanò – Lifestyles of opportunistic bacteria in human macrophages; Memorial Symposium for Stefania Spanò and Massimiliano Baldasarre, University of Aberdeen, Scotland.
Valvano, M. A. (Invited speaker)
02 Sept 2024Activity: Talk or presentation types › Invited talk
Press/Media
-
Listeria outbreak - how worried should you be, according to experts
20/03/2025
1 item of Media coverage
Press/Media: Expert Comment
-
Antibiotic-resistant bacteria can hide in human cells, says new study
04/03/2025
1 Media contribution
Press/Media: Other
-
Antibiotic-resistant bacteria can hide in human cells without alerting the immune system - new study
04/03/2025
1 item of Media coverage
Press/Media: Other
-
Microbiology breakthrough may lead to better treatments in the fight against antibiotic resistance
15/01/2024
1 item of Media coverage
Press/Media: Public Engagement Activities
-
TYPE VI SECRETION SYSTEM: THE ULTIMATE WEAPON FOR MICROBIAL WARFARE
Anderson, A., Morrell, B., Lopez Campos, G. & Valvano, M. A.
02/01/2024
1 Media contribution
Press/Media: Other