Fungal pathogens cause over a billion human infections annually, leading to more than 1.6 million deaths each year. The scarcity of available antifungal drugs intensifies the public health threat posed by human pathogenic fungal infections. Therefore there is a critical demand for novel, safe, and effective antifungal agents. Although chitinases are established as effective antifungal agents against phytopathogenic fungi, research on their activity against human pathogenic fungi is limited. The present study seeks to investigate the anti-inflammatory and antifungal activity of bacterial and fungal chitinase against human pathogenic fungi. The antifungal efficacy of bacterial chitinase from , fungal chitinase from , and a combination of both was determined by calculating the inhibition percentage in fungal growth, indicated by the reduction in the dry mass of the fungi. Additionally, the anti-inflammatory activity of these chitinases was assessed by measuring the inhibition of albumin denaturation. Results revealed that chitinases exhibited greater antifungal activity compared to the standard. Notably, bacterial chitinase demonstrated higher effectiveness than fungal chitinase against , while the bacterial and fungal chitinase had similar effects against different and . The combination of bacterial and fungal chitinase demonstrated the highest antifungal activity against all tested fungi. Furthermore, the anti-inflammatory activity indicated that chitinases prevented 98% of albumin denaturation, marking the first study reporting the anti-inflammatory role of chitinases in preventing albumin denaturation. Additional in-vivo studies are necessary to explore the antifungal activity of chitinases against human pathogenic fungi and investigate the anti-inflammatory mechanisms of chitinase.
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http://dx.doi.org/10.1007/s12088-024-01253-2 | DOI Listing |
Microbiol Spectr
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Rickettsial Zoonoses Branch, Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, Atlanta, Georgia, USA.
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Department of Microbiology and Immunology, The University of Melbourne, The Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria, Australia.
Unlabelled: Respiratory and encephalitic virus infections represent a significant risk to public health globally. Detailed investigations of immunological responses and disease outcomes during sequential virus infections are rare. Here, we define the impact of influenza virus infection on a subsequent virus encephalitis.
View Article and Find Full Text PDFJ Bacteriol
January 2025
Department of Microbiology, Howard Taylor Ricketts Laboratory, The University of Chicago, Chicago, Illinois, USA.
Protein secretion is an essential cell process in bacteria, required for cell envelope biogenesis, export of virulence factors, and acquisition of nutrients, among other important functions. In the Sec secretion pathway, signal peptide-bearing precursors are recognized by the SecA ATPase and pushed across the membrane through a translocon channel made of the proteins SecY, SecE, and SecG. The Sec pathway has been extensively studied in the model organism , but the Sec pathways of other bacteria such as the human pathogen differ in important ways from this model.
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Laboratory of Animal Pathology and Public Health, National Key Laboratory of Veterinary Public Health and Safety, College of Veterinary Medicine, China Agricultural University, Beijing, China.
Unlabelled: Hepatitis E virus (HEV) is a globally prevalent zoonotic pathogen that is primarily spread through the fecal-oral route, such as by consuming undercooked or contaminated pork. HEV infection leads to an estimated 3.3 million symptomatic cases of viral hepatitis and 70,000 deaths in human populations each year.
View Article and Find Full Text PDFElife
January 2025
Department of Medical Microbiology, Radboud University Medical Center, Nijmegen, Netherlands.
Circulating sexual stages of ) can be transmitted from humans to mosquitoes, thereby furthering the spread of malaria in the population. It is well established that antibodies can efficiently block parasite transmission. In search for naturally acquired antibodies targets on sexual stages, we established an efficient method for target-agnostic single B cell activation followed by high-throughput selection of human monoclonal antibodies (mAbs) reactive to sexual stages of in the form of gametes and gametocyte extracts.
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