"We want to help patients. This is why we work in science. We are really proud of what we have achieved here. We are confident NACE2i is a potential treatment for long COVID that will relieve those debilitating symptoms and revive immune function," Professor Rao said.
The first major study by the QIMR Berghofer research team in 2021 showed the SARS-CoV-2 virus hijacks the ACE2 receptor on the cell's surface and draws it into the nucleus or control centre of the cell, triggering a process that is essential for the virus to replicate.
NACE2i works by reprogramming the hijacked ACE2 receptor which disarms the virus and stops it replicating. The reprogrammed ACE2 receptor is returned to the cell surface where it acts as a lock that prevents the virus from entering the cell. This process also reverses the inflammation COVID-19 causes in the lungs.
Professor Sudha Rao and Dr Wen Juan Tu
First author and QIMR Berghofer Research Officer Dr Wen Juan Tu said it was very exciting to see NACE2i repairing damaged lung tissue in pre-clinical models.
"The images are really remarkable. In the damaged lung, you see it is missing the surface layer of the lung bronchiole area. After treatment with NACE2i, the lung is restored to normal function with a healthy surface layer," Dr Tu said.
The QIMR Berghofer researchers have also developed a biomarker blood test to detect the presence of the protective ACE2 receptor layer around cells. They tested this in human blood samples and found it was lacking in patients who had repeated COVID-19 infections. The study found NACE2i restored this biomarker of protection.
Immunologist and co-lead author Professor Nabila Seddiki who is Research Director of Immunology & Infectious Diseases Commissariat à l'Energie Atomique (CEA), Paris-Saclay University and INSERM in France tested NACE2i in their pre-clinical COVID-19 models.
"When we looked at the results it was very clear the peptides were inhibiting inflammation in our SARS-CoV-2 models which was really great to see. We have been working together for a long time with each of us bringing our own expertise to the work and that's how we have achieved what we have," Professor Seddiki said.
The next step is to begin clinical trials of NACE2i.
High tech imaging of SARS-CoV-2 infected lung tissue
QIMR Berghofer's world-leading Scientific Services team provided cutting-edge imaging technology to support the research and development of NACE2i. International collaborators included NanoString Technologies which worked with the researchers to conduct world-first digital spatial profiling experiments, and MetaGene which assisted the team with high-tech digital pathology analysis.
Professor Rao paid tribute to funding from philanthropists and the Queensland Government which enabled the research.
"In the early days of the pandemic, this was just an idea. This really shows that if we didn't have philanthropists like Clive Berghofer, and Queensland Health having the confidence in us to give us the funding, we would not be here. I cannot stress enough that without that initial funding, we would not have achieved what we have," Professor Rao said.
The research paper has been published in the journal Nature Communications and can be found at this link https://www.nature.com/articles/s41467-023-39341-4 with DOI 10.1038/s41467-023-39341-4
