The scientists took the genes for the most effective liver cancer antigen
receptors on those T cells, put those receptors on human T cells and the resulting engineered human T cells eradicated the cancer as well, without hurting normal liver cells, they report in the journal Hepatology.
These antibody drugs block
receptors on T cells that tumors use to hide from the immune system.
In this latest study, the researchers placed an antibody with a weak radioactive component onto
the receptors on the T - cells» outer membrane.
Receptors on T - cells recognize antigens, or pieces of other cells that trigger an immune response, particularly antibodies.
Antigen - presenting cells (APCs), such as dendritic cells and macrophages, activate T cells by engaging protein
receptors on the T cell surface.
One way cancer cells do this is by expressing a protein ligand that binds to
a receptor on the T cells to prevent the T cell from recognizing and attacking the cancer cell.
The major histocompatibility complex - restricted antigen
receptor on T cells in mouse and man: identification of constant and variable peptides.
Allison and his colleagues blocked
this receptor on T - cells with an antibody, and discovered that T - cells devoured cancer cells in mice.
Binding of PD - L1 to the co-stimulatory
receptor on T cells, PD - 1, promotes inactivation and apoptosis of activated anti-tumor T cells.
Takeda et al. engineered mice that were either unable to produce a particular LPA
receptor on their T - cells, or that produced less LPA than normal.
Not exact matches
The race to become the first company with a chimeric antigen
receptor T - cell (CAR -
T) cancer therapy
on the market has entered its final leg, and Kite Pharma now appears to have a big advantage.
The antibody binds to a protein
on the surface of
T cells called the PD - 1
receptor.
A transformative cancer therapy based
on modified immune cells has lured doctors, companies, and patients alike, but many are hitting a frustrating roadblock: generating enough of these chimeric antigen
receptor (CAR)-
T cells to meet surging demand.
The immune system depends
on molecules called
T cell
receptors on the surface of
T cells to recognize and respond to foreign antigens from virus - infected cells, tumors and other threats.
These are
receptors on immune cells, which control for example effector
T - cells by dampening their activation if damage to healthy cells is imminent.
This drug (vedolizumab) blocks a specific adhesion molecule
on the surface of the
T - cell and thereby inhibits immune cells from binding themselves to
receptors present in the intestine, preventing the
T - cells from penetrating the blood vessels in the intestinal tissue.
Since genes for the
T - cell
receptor beta chain were previously shown to be
on mouse chromosome 6, all three of the Ig - like multigene families expressed and rearranged in
T cells are located
on different chromosomes, just as are the B - cell multigene families for the Ig heavy chain, and the Ig kappa and lambda light chains.
The accuracy for human eye and hair color is much higher at 0.9, and chronological age — based
on T cell
receptors — is the same.
The drug blocks CTLA - 4, a protein
receptor on the surface of
T - cells that serves as a molecular stop sign, preventing the immune system from going into overdrive.
By latching onto
receptors on the surface of
T lymphocytes, gp120 allows the virus to enter the cells and reproduce.
3) Protein binds to HIV fragment
on helper
T cell and CD3
receptor on killer
T cell, activating the killer
T cell and bringing the two cells close together.
2) Protein binds to CD3
receptor on helper
T cell, activating it so the helper
T cell starts making HIV and displaying pieces of virus (red)
on its surface.
The engineered protein has two ends: one activates
T cells by binding to a surface molecule called the CD3
receptor, and the other — based
on an antibody called VRC07 — powerfully binds to more than 90 percent of HIV strains.
Chimeric antigen
receptor (CAR)
T - cell therapies utilize a patient's own
T cells that have been genetically engineered to bind to a specific antigen
on target cancer cells.
For the CRISPR trial, a UPenn - led team wants to remove
T cells from patients and use a harmless virus to give the cells a
receptor for NY - ESO - 1, a protein that is often present
on certain tumors but not
on most healthy cells.
The MSRs were then coated with lipids that formed a thin supported lipid bilayer (SLB), which resembles the outer membrane of APCs and that the researchers then functionalized with a pair of
T cell - stimulating antibodies that remain mobile in the lipid layer and can bind to
receptor / co-
receptor molecules
on the surface of
T cells.
In particular, Nguyen and Ehrenstein discovered that adalimumab increases the expression of TNF
on the surface of patient monocytes and promotes the association of these TNF molecules with
receptor proteins
on the surface of regulatory
T cells.
To address such obstacles, Roybal, now an assistant professor at the University of California, San Francisco and his colleague Leonardo Morsut turned to a signaling molecule
on T cells called the Notch
receptor, known to be involved in several developmental and biological processes.
Studies
on the gut suggest that dendritic cells there release a chemical that induces
T cells to produce a
receptor that helps them home in
on the intestine.
PD - 1 (programmed cell death protein 1) is a
receptor on the surface of
T cells (the white blood cells that are part of the immune system), while PD - L1 (programmed death - ligand 1) is a molecule that binds to PD - 1 and is often over-expressed
on the surface of cancer cells, enabling them to evade the immune system and allow cancer to grow and spread.
«The docking protein [the
receptor] keeps the virus
on the dendritic cell, and then it infects passing
T cells,» Nair says.
The researchers are now looking at how ICOS signals can be altered to diminish autoimmune disorders and augmented for more effective vaccine development, and are beginning research
on how ICOS signaling may benefit Chimeric Antigen
Receptor -
T cell (CAR -
T) therapies, which involves engineering of patient's own immune cells to recognize and attack their cancers.
Now, the bispecific antibody grabs a killer
T cell that has a CD3
receptor and, with its second arm, finds a recently activated cell that has HIV proteins
on its surface.
The ccr5
receptor, a protein found
on the surface of cd4
T - cell lymphocytes in the immune system (try saying that quickly), may hold the key to ending the aids pandemic (see «The End of AIDS»).
Because diseases such as cancer tend to evade detection by
T - cells»
receptors, allowing a tumor to grow unchecked, scientists have long sought «intel»
on this process as a means of developing therapies that target malignant cells, but leave healthy cells alone.
Using an unsupervised learning algorithm, the team was able to convert the
T - cell
receptor sequencing data into numeric distances based
on similarities in the
receptor sequences and cluster them by functional specificity.
More recently, the membrane
receptor GARP was shown to bind to TGF - beta
on regulatory
T cells and platelets to modulate their activity.
The Johns Hopkins team tested ImmunoMap's ability to correlate immune responses
on receptor sequencing data from
T - cells in the tumors of 34 patients with cancer enrolled in a nationwide clinical trial of the immunotherapy drug nivolumab.
The modified
T cells contain a protein known as a chimeric antigen
receptor (CAR), which is designed to target the CD19 protein found
on the surface of B cells, including the cancerous B cells that characterize several types of leukemia and lymphoma.
The
T cells use their CAR
receptors to bind to molecules
on target cells, and the act of binding triggers an internal signal that strongly activates the
T cells — so that they swiftly destroy their targets.
T - FORCE Two
T cells (orange) attack a cancer cell (blue), using special
receptors to zero in
on the cancer.
The resulting treatment consists of four parts: an antibody targeted to the tumor; a vaccine targeted to the tumor; IL - 2; and a molecule that blocks PD1, a
receptor found
on T cells.
The drug tested is an antibody that blocks a
receptor called PD - 1
on the surface of the immune system's
T cells.
T - cells recognize and remove germs using a molecule
on their surface called the
T - cell
receptor.
The studies, conducted separately
on the East and West coasts of the United States, attempt to make the immune system resistant to HIV by crippling a
receptor, known as CCR5,
on T cells that the virus uses during the infection process.
The authors catalogued several co-stimulatory molecules and
receptors present
on the surfaces of the PD -1-responsive
T cells, which possibly could be targets for drugs.
For example,
T - cells have a
receptor on their surface called PD - 1, which acts as an off switch.
Next steps include He's collaboration with Piedmont Atlanta Hospital to retrieve
T cells, liver cancer cells and healthy tissue normally removed from patients during surgery, put the mouse
receptor genes
on these
T cells and monitor in a dish both how those cells now fight the tumor and react to healthy human tissue.
«To understand the factors behind
T - cell -
receptor binding to peptides will have major impact
on biomedical developments, including vaccine design and immunotherapy.»
The mouse
T cells developed
receptors for this clearly suspicious invader and the genes for the
receptors is what He later put
on human
T cells.