Scientists identify possible new treatment for COVID-19
Researchers tested the substance in human lung cell samples

Date:
March 9, 2022
Source:
Cedars-Sinai Medical Center
Summary:
Researchers have identified a potential new therapy for COVID-19:
a biologic substance created by reengineered human skin cells.



FULL STORY ========================================================================== Investigators at Cedars-Sinai have identified a potential new therapy for COVID-19: a biologic substance created by reengineered human skin cells.


========================================================================== Scientists found the substance stopped SARS-CoV-2, the virus that causes
COVID- 19, from reproducing itself and also protected infected cells
when tested in human lung cells. Although still in the early stages,
the findings open the possibility of having a new therapy for COVID-19 patients. The details of the potential therapy are published in the
journal Biomaterials and Biosystems.

"We were surprised to find this potential therapy shuts down a novel
pathway for viral replication and also protects infected cells," saidAhmed
G. Ibrahim, PhD, MPH, assistant professor in the Smidt Heart Institute
at Cedars-Sinai and first author of the study.

Few treatments currently exist for COVID-19 and the ones that do primarily focus solely on preventing the virus from replicating. This new potential treatment inhibits replication but also protects or repairs tissue,
which is important because COVID-19 can cause symptoms that affect
patients long after the viral infection has been cleared.

The potential therapy investigated in this study was created by scientists using skin cells called dermal fibroblasts. The investigators engineered
the cells to produce therapeutic extracellular vesicles (EVs), which
are nanoparticles that serve as a communication system between cells
and tissue.

Engineering these fibroblasts allowed them to secrete EVs -- which the investigators dubbed "ASTEX" -- with the ability to repair tissue.

In previous experiments, the investigators demonstrated that ASTEX
can repair heart tissue, lung tissue and muscle damage in laboratory
mice. When the COVID- 19 pandemic hit in 2020, the investigators turned
to studying whether ASTEX could be used as treatment against SARS-CoV-2.



==========================================================================
The study was done through a collaboration with investigators at UCLA
who tested ASTEX by applying it to human lung epithelial cells, cells
that line the pulmonary tract and are the targets of SARS-CoV-2 infection.

They discovered that ASTEX prevented cells from launching an inflammatory process that could lead to cell death. Cells treated with ASTEX also
made fewer of a type of protein called ACE that SARS-CoV-2 may use to
infect cells.

The team then compared the potential treatment with remdesivir, a drug currently used to treat COVID-19, and found that remdesivir did not
inhibit production of ACE. Instead, remdesivir stops the virus from
latching on to a protein called ACE2. ASTEX, therefore, may present
another way to prevent the virus from entering cells.

"Viruses don't have their own machinery to get into cells, so they use proteins," Ibrahim said. "We believe targeting ACE proteins is just
one way SARS-CoV-2 infiltrates cells, hijacks their genetic information
and replicates itself in the body." ASTEX appears to have stopped this hijacking process.

"This potential anti-COVID-19 biological therapyis novel in that it has
two facets: It protects infected cells, which remdesivir does not do,
and also inhibits viral replication," said senior author Eduardo Marba'n,
MD, PhD, executive director of the Smidt Heart Institute and the Mark
S. Siegel Family Foundation Distinguished Professor at Cedars-Sinai.

Investigators are planning future studies.

Funding: The study was funded by the National Institutes of Health
under award numbers RO1124074, 1RO1EY032149, the David Geffen School
of Medicine at UCLA, the UCLA Broad Stem Cell Research Center, and the California Institute for Regenerative Medicine Discovery Award.


========================================================================== Story Source: Materials provided by Cedars-Sinai_Medical_Center. Note:
Content may be edited for style and length.


========================================================================== Journal Reference:
1. A.G. Ibrahim, A. Ciullo, C. Li, G. Garcia, K. Peck, K. Miyamoto, V.

Arumugaswami, E. Marba'n. Engineered extracellular
vesicles antagonize SARS-CoV-2 infection by inhibiting mTOR
signaling. Biomaterials and Biosystems, 2022; 6: 100042 DOI:
10.1016/j.bbiosy.2022.100042 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2022/03/220309111052.htm

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