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Recce Pharmaceuticals Announces Lead Synthetic Anti-infective RECCE® 327 Demonstrates World First Multiple Mechanisms of Action against E. coli bacteriaHighlights:
SYDNEY, Australia, June 01, 2021 (GLOBE NEWSWIRE) -- Recce Pharmaceuticals Ltd (ASX:RCE) (FSE:R9Q) (Company), the Company developing new classes of synthetic anti-infectives, is pleased to announce positive results from a pre-clinical study investigating the Mechanism of Action (MoA) of its lead compound RECCE® 327 (R327). R327 is a broad-spectrum synthetic anti-infective that has potential to address the urgent global health threat posed by antibiotic resistant superbugs and emerging viral pathogens. “The data from this study further supports the potential of RECCE® 327 to provide a novel and universal way to treat harmful infections,” said Executive Director & Chief Scientific Officer Michele Dilizia. “We are excited about these highly encouraging results as they provide important insights regarding how RECCE® 327 is able to work repeatedly against the same strain of bacteria and their superbug forms. The study was performed by independent, world leaders in bacterial Mechanism of Action analysis and antibiotic profiling. Key takeaways from this study are as follows:
Initial studies were undertaken to determine the MIC of R327 against various test strains of Gram-negative Escherichia coli (E. coli) bacteria in their actively growing (dividing) form to ultimately elucidate R327’s MoA. All conditions started with 1x108 CFU/ml E. coli cells which were then treated with R327 for the indicated period of time. A graphic accompanying this announcement is available at https://www.globenewswire.com/NewsRoom/AttachmentNg/5d6da13a-49b3-4714-b7d3-98a82f772a59 The bactericidal effect was evident immediately in all tested concentrations. In 5x MIC of R327 ‘crashing’ the ATP viability of bacterial cells in minutes, reportedly faster than any antibiotic tested previously. Study 2 – Efficacy of R327 against actively growing or dividing E. coli Second study determined whether R327 affects the assembly of the bacterial cell division complex. Cell division in bacteria is mediated by the tubulin-like protein FtsZ – a protein essential for cell division (bacteria reproduction) that requires cellular energy. The E. coli clinical isolates were treated to 1x and 5x MIC for 30 minutes and showed 22% (1x MIC) and 17% (5x MIC) of the cells contained FtsZ rings, with the remaining cells containing small FtsZ-GFP filaments, suggesting mid-cell FtsZ rings had disassembled. By 60 minutes, only 17% (1x MIC) and 8% (5x MIC) contained FtsZ rings. The remaining cells displayed small amount of FtsZ-GFP and was completely diffused throughout the cell, indicating a disassembled FtsZ-GFP. These results highlight a decreased occurrence of FtsZ-GFP rings in a concentration dependent manner, concluding that treatment with R327 leads to disassembly of the FtsZ-GFP rings (not allowing bacterial cells to divide, multiply and spread infection). ?A graphic accompanying this announcement is available at https://www.globenewswire.com/NewsRoom/AttachmentNg/d5dc4e52-a1eb-46e9-b9cc-d070f5801f2f The image shows treatment of R327 against E. coli at 1x and 5x MIC leading to disassembly of the FtsZ-GFP rings, supporting initial studies which indicated R327 inactivates cellular bioenergetics and is rapidly and irreversibly bactericidal. Graphics accompanying this announcement are available at: https://www.globenewswire.com/NewsRoom/AttachmentNg/6bad6567-14fa-4944-b185-bf8f56dc50c3 Study 3 – Efficacy of R327 against nondividing or stationary-phase E. coli A separate, but related study undertaken was to determine whether R327 is active against nondividing or stationary-phase E. coli using clinical isolate cells. A graphic accompanying this announcement is available at https://www.globenewswire.com/NewsRoom/AttachmentNg/68a57e67-3013-419c-9121-e5d738a59092 Current antibiotics rarely retain bactericidal activities against nondividing bacterial cells; however, R327 shows significant activity against both slow-growing bacteria and actively dividing cells, thereby enabling continuous treatment of infections throughout the bacterial cell life cycle. After only 10 minutes of R327 at 1x and 2x MIC, the viable cell counts decreased 100-fold, and after another 30 minutes, cell count decreased further to 10,000-fold (approximately). When exposed to the highest concentration, 5x MIC of R327, viable cell counts decreased 10,000-fold within 10 minutes. In comparison to the positive and negative controls, the report found ampicillin to be nearly completely resistant and ciprofloxacin only having mild activity against the cells. These findings are aimed at elucidating R327’s mechanism of action and will be presented at the World Microbe Forum taking place virtually 20-24 June 2021. Similarly, studies are underway to explore the effect and MoA of R327 on Gram-positive bacteria. About Recce Pharmaceuticals Ltd Recce Pharmaceuticals Ltd (ASX: RCE) is pioneering the development and commercialization of New Classes of Synthetic Anti-Infectives designed to address the urgent global health problems of antibiotic resistant superbugs and emerging viral pathogens. Recce’s anti-infective pipeline is unique and comprised of broad-spectrum synthetic polymer antibiotics RECCE® 327, RECCE® 435, and RECCE® 529 for viral infections with unique mechanisms of action against hyper-mutation on bacteria and viruses, respectively. Patented lead candidate RECCE® 327 has been developed for the treatment of blood infections and sepsis derived from E. coli and S. aureus bacteria – including their superbug forms. Recce’s new antibiotic compound, RECCE® 435, has been formulated for oral use. The FDA has awarded RECCE® 327 Qualified Infectious Disease Product designation under the Generating Antibiotic Initiatives Now (GAIN) Act – labelling it for Fast Track Designation, plus 10 years of market exclusivity post approval. Further to this designation, RECCE® 327 has been included on The Pew Charitable Trusts Global New Antibiotics in Development Pipeline as the only synthetic polymer and sepsis drug candidate in development. Recce wholly owns its automated manufacturing, ready to support first-in-human clinical trials. Recce’s anti- infective pipeline seeks to exploit the unique capabilities of RECCE® technologies targeting synergistic, unmet medical needs. Corporate Contact Media and Investor Relations (AU) Media and Investor Relations (USA) |