Intracellular delivery of protein drugs with an autonomously lysing bacterial system reduces tumor growth and metastases

Vishnu Raman, Nele Van Dessel, Christopher L. Hall, Victoria E. Wetherby, Samantha A. Whitney, Emily L. Kolewe, Shoshana M. K. Bloom, Abhinav Sharma, Jeanne A. Hardy, Mathieu Bollen, Aleyde Van Eynde and Neil S. Forbes ()
Additional contact information
Vishnu Raman: University of Massachusetts, Amherst
Nele Van Dessel: University of Massachusetts, Amherst
Christopher L. Hall: University of Massachusetts, Amherst
Victoria E. Wetherby: Ernest Pharmaceuticals, LLC
Samantha A. Whitney: University of Massachusetts, Amherst
Emily L. Kolewe: University of Massachusetts, Amherst
Shoshana M. K. Bloom: University of Massachusetts, Amherst
Abhinav Sharma: University of Massachusetts, Amherst
Jeanne A. Hardy: University of Massachusetts, Amherst
Mathieu Bollen: KU Leuven
Aleyde Van Eynde: KU Leuven
Neil S. Forbes: University of Massachusetts, Amherst

Nature Communications, 2021, vol. 12, issue 1, 1-14

Abstract: Abstract Critical cancer pathways often cannot be targeted because of limited efficiency crossing cell membranes. Here we report the development of a Salmonella-based intracellular delivery system to address this challenge. We engineer genetic circuits that (1) activate the regulator flhDC to drive invasion and (2) induce lysis to release proteins into tumor cells. Released protein drugs diffuse from Salmonella containing vacuoles into the cellular cytoplasm where they interact with their therapeutic targets. Control of invasion with flhDC increases delivery over 500 times. The autonomous triggering of lysis after invasion makes the platform self-limiting and prevents drug release in healthy organs. Bacterial delivery of constitutively active caspase-3 blocks the growth of hepatocellular carcinoma and lung metastases, and increases survival in mice. This success in targeted killing of cancer cells provides critical evidence that this approach will be applicable to a wide range of protein drugs for the treatment of solid tumors.

Date: 2021
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DOI: 10.1038/s41467-021-26367-9

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