New Antibody Treatment Shows Promise in Halting Tissue Fibrosis, Study Finds

Researchers at the University of Illinois Urbana-Champaign and Mie University in Japan have discovered that a bacterial protein fragment called corisin drives pulmonary fibrosis by disrupting cellular quality control. Laboratory tests demonstrate that blocking corisin with a specially developed antibody successfully neutralizes its lethal effects on lung tissue.

Tissue fibrosis remains a major clinical challenge across modern healthcare, contributing to nearly half of all deaths in developed nations according to researchers. When healthy tissue in organs like the lungs, kidneys, or liver is progressively damaged or killed, it is replaced by scar tissue. This new investigation shifts our understanding of corisin from an intriguing peptide associated with fibrosis to a mechanistically defined, causally supported driver of disease.

In Plain English: The Clinical Takeaway

• The Culprit: A small protein fragment called corisin, produced by bacteria that are a natural part of the human gut microbiome and residing in the respiratory tract, can travel into lung cells and damage them.
• The Mechanism: Corisin attacks the mitochondria—an organelle responsible for producing energy and for quality control of the proteins—disrupting protein quality control, causing oxidative stress, and forming scar tissue.
• The Solution: Scientists have created an experimental antibody that binds to corisin, neutralizing its harmful effects and significantly reducing tissue damage in preclinical models.

Cellular Mechanics: How Corisin Triggers Fibrotic Degeneration

To understand how corisin damages human tissue, the research team analyzed fluid samples collected from the lungs of patients with pulmonary fibrosis during routine clinical care and acute disease exacerbations in Japan. Upon examining these samples, investigators isolated corisin-related bacterial DNA, marking the first evidence that peptide-producing microbes were present in the lungs.

When the researchers removed corisin from patient fluid samples using their custom antibody, the fluid lost its cytotoxic (cell-killing) properties when applied to healthy cell cultures. In this case, corisin infiltrates cells lining the lungs and accumulates inside the mitochondria. By disrupting mitochondrial quality control, the peptide sparks oxidative stress, premature cellular aging, and cell death coupled with excessive scarring.

To confirm that local bacterial production in the respiratory tract could independently drive disease, the team engineered murine (mouse) models to continuously express corisin directly in their lungs. These animals spontaneously developed pulmonary fibrosis without any external bacterial introduction. Furthermore, experiments revealed that corisin is remarkably potent, exerting destructive biological effects at extremely low concentrations.

Therapeutic Intervention and Preclinical Efficacy

When the mice engineered to produce corisin were treated with the team’s corisin-binding antibody, researchers observed a reduction in pulmonary fibrosis and tissue degradation.

Photo: miragenews.com

Research Parameter	Experimental Observation
Primary Peptide	Corisin (fragmented from a bacterial protein)
Target Organelle	Mitochondria (disrupting energy production and protein quality control)
Key Pathological Outcome	Oxidative stress, premature cellular aging, and tissue fibrosis
Therapeutic Intervention	Custom corisin-binding antibody demonstrating effective neutralization in preclinical models

The underlying research was led by University of Illinois animal sciences professor Isaac Cann and Mie University immunology professor Dr. Esteban Gabazza. Woese Institute for Genomic Biology at Illinois.

Contraindications & When to Consult a Doctor

References

• University of Illinois News Bureau. “A bacterial protein fragment drives tissue fibrosis, but antibody treatment can help, study finds.”

Disclaimer: This article is for informational and educational purposes only and does not constitute medical advice, diagnosis, or treatment. Always consult a qualified physician regarding any questions about a medical condition.