Synchronized cycles of bacterial lysis for in vivo delivery
By M. O. Din, Tal Danino, Arthur Prindle, Matthew Skalak, Jangir Selimkhanov, Kaitlin Allen, E. Julio, Eta Atolia, Lev S. Tsimring, Sangeeta N. Bhatia and 1 more. Nature, 2016
702 citations recorded by the source corpus.
The widespread view of bacteria as strictly pathogenic has given way to an appreciation of the prevalence of some beneficial microbes within the human body. It is perhaps inevitable that some bacteria would evolve to preferentially grow in environments that harbour disease and thus provide a natural platform for the development of engineered therapies. Such therapies could benefit from bacteria that are programmed to limit bacterial growth while continually producing and releasing cytotoxic agents in situ. Here we engineer a clinically relevant bacterium to lyse synchronously at a threshold population density and to release genetically encoded cargo. Following quorum lysis, a small number of surviving bacteria reseed the growing population, thus leading to pulsatile delivery cycles. We used microfluidic devices to characterize the engineered lysis strain and we demonstrate its potential as a drug delivery platform via co-culture with human cancer cells in vitro. As a proof of principle, we tracked the bacterial population dynamics in ectopic syngeneic colorectal tumours in mice via a luminescent reporter. The lysis strain exhibits pulsatile population dynamics in vivo, with mean bacterial luminescence that remained two orders of magnitude lower than an unmodified strain. Finally, guided by previous findings that certain bacteria can enhance the efficacy of standard therapies, we orally administered the lysis strain alone or in combination with a clinical chemotherapeutic to a syngeneic mouse transplantation model of hepatic colorectal metastases. We found that the combination of both circuit-engineered bacteria and chemotherapy leads to a notable reduction of tumour activity along with a marked survival benefit over either therapy alone. Our approach establishes a methodology for leveraging the tools of synthetic biology to exploit the natural propensity for certain bacteria to colonize disease sites.
Subfields: Biomedical Engineering, Biotechnology
View Paper: https://www.semanticscholar.org/paper/12b390a23b4464dc085833e57a8cbbe304f6caa7
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In Biomedical Engineering
Citations in the corpus
- The microbiome and human cancer (2021, background): “coli and Salmonella could be engineered to lyse at a threshold population density, releasing a chemokine, hemolysin, or pro-apoptotic protein, or all three, into the TME at desired periodic intervals (155).”