Immunotherapy-resistant cancers eliminated in mouse study
Antibody that blocks TREM2 protein frees immune cells to reject cancer


Date:
August 11, 2020
Source:
Washington University School of Medicine
Summary:
In a mouse study, researchers have found that an antibody that
targets the protein TREM2 empowers tumor-destroying immune cells
and improves the effectiveness of cancer immunotherapy.



FULL STORY ========================================================================== Immunotherapy has revolutionized cancer treatment by stimulating the
patient's own immune system to attack cancer cells, yielding remarkably
quick and complete remission in some cases. But such drugs work for
less than a quarter of patients because tumors are notoriously adept at
evading immune assault.


==========================================================================
A new study in mice by researchers at Washington University School
of Medicine in St. Louis has shown that the effects of a standard
immunotherapy drug can be enhanced by blocking the protein TREM2,
resulting in complete elimination of tumors. The findings, which are
published Aug. 11 in the journal Cell, point to a potential new way to
unlock the power of immunotherapy for more cancer patients.

"Essentially, we have found a new tool to enhance tumor immunotherapy,"
said senior author Marco Colonna, MD, the Robert Rock Belliveau, MD,
Professor of Pathology. "An antibody against TREM2 alone reduces the
growth of certain tumors, and when we combine it with an immunotherapy
drug, we see total rejection of the tumor. The nice thing is that
some anti-TREM2 antibodies are already in clinical trials for another
disease. We have to do more work in animal models to verify these results,
but if those work, we'd be able to move into clinical trials fairly
easily because there are already a number of antibodies available."
T cells, a kind of immune cell, have the ability to detect and destroy
tumor cells. To survive, tumors create a suppressive immune environment in
and around themselves that keeps T cells subdued. A type of immunotherapy
known as checkpoint inhibition wakes T cells from their quiescence so
they can begin attacking the tumor. But if the tumor environment is
still immunosuppressive, checkpoint inhibition alone may not be enough
to eliminate the tumor.

An expert on the immune system, Colonna has long studied a protein called
TREM2 in the context of Alzheimer's disease, where it is associated
with underperforming immune cells in the brain. Colonna and first author Martina Molgora, PhD, a postdoctoral researcher, realized that the same
kind of immune cells, known as macrophages, also were found in tumors,
where they produce TREM2 and promote an environment that suppresses the activity of T cells.

"When we looked at where TREM2 is found in the body, we found that it is expressed at high levels inside the tumor and not outside of the tumor," Colonna said. "So it's actually an ideal target, because if you engage
TREM2, you'll have little effect on peripheral tissue." Colonna and
Molgora -- along with colleagues Robert D. Schreiber, PhD, the Andrew
M. and Jane M. Bursky Distinguished Professor; and William Vermi, MD,
an immunologist at the University of Brescia -- set out to determine
whether inhibiting TREM2 could reduce immunosuppression and boost the tumor-killing powers of T cells.



==========================================================================
As part of this study, the researchers injected cancerous cells into mice
to induce the development of a sarcoma. The mice were divided into four
groups. In one group, the mice received an antibody that blocked TREM2;
in another group, a checkpoint inhibitor; in the third group, both; and
the fourth group, placebo. In the mice that received only placebo, the
sarcomas grew steadily. In the mice that received the TREM2 antibody or
the checkpoint inhibitor alone, the tumors grew more slowly and plateaued
or, in a few cases, disappeared. But all of the mice that received both antibodies rejected the tumors completely.

The researchers repeated the experiment using a colorectal cancer cell
line with similarly impressive results.

With the help of graduate student Ekaterina Esaulova, who works in the
lab of Maxim Artyomov, PhD, an associate professor of pathology and
immunology, the researchers analyzed immune cells in the tumors of the
mice treated with the TREM2 antibody alone. They found that suppressive macrophages were largely missing and that T cells were plentiful and
active, indicating that blocking TREM2 is an effective means of boosting anti-tumor T cell activity.

Further experiments revealed that macrophages with TREM2 are found in many kinds of cancers. To assess the relationship between TREM2 expression and clinical outcomes, the researchers turned to The Cancer Genome Atlas,
a publicly available database of cancer genetics jointly maintained by
the National Cancer Institute and the National Human Genome Research
Institute.

They found that higher levels of TREM2 correlated with shorter survival
in both colorectal cancer and breast cancer.

The researchers are now expanding their study of TREM2 to other kinds
of cancers to see whether TREM2 inhibition is a promising strategy for
a range of cancers.

"We saw that TREM2 is expressed on over 200 cases of human cancers and different subtypes, but we have only tested models of the colon, sarcoma
and breast, so there are other models to test," Molgora said. "And then we
also have a mouse model with a human version of TREM2." Added Colonna:
"The next step is to do the animal model using the human antibody. And
then if that works, we'd be ready, I think, to go into a clinical trial."

========================================================================== Story Source: Materials provided by
Washington_University_School_of_Medicine. Original written by Tamara
Bhandari. Note: Content may be edited for style and length.


========================================================================== Journal Reference:
1. Martina Molgora, Ekaterina Esaulova, William Vermi, Jinchao Hou, Yun
Chen, Jingqin Luo, Simone Brioschi, Mattia Bugatti, Andrea
Salvatore Omodei, Biancamaria Ricci, Catrina Fronick, Santosh
K. Panda, Yoshiko Takeuchi, Matthew M. Gubin, Roberta Faccio,
Marina Cella, Susan Gilfillan, Emil R. Unanue, Maxim N. Artyomov,
Robert D. Schreiber, Marco Colonna. TREM2 Modulation Remodels the
Tumor Myeloid Landscape Enhancing Anti-PD-1 Immunotherapy. Cell,
2020; DOI: 10.1016/j.cell.2020.07.013 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2020/08/200811120133.htm

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