Monoclonal Antibodies and Their Side Effects
One way the soundbox ‘s immune system attacks foreign substances is by making big numbers of antibodies. An antibody is a protein that sticks to a specific protein called an antigen. Antibodies circulate throughout the body until they find and attach to the antigen. once attached, they can force other parts of the immune system to destroy the cells containing the antigen .
Researchers can design antibodies that specifically target a certain antigen, such as one rule on cancer cells. They can then make many copies of that antibody in the lab. These are known as monoclonal antibodies ( mAbs or Moabs ).
monoclonal antibody antibodies are used to treat many diseases, including some types of cancer. To make a monoclonal antibody, researchers first base have to identify the right field antigen to attack. Finding the correct antigens for cancer cells is not constantly easy, and thus far mAbs have proven to be more useful against some cancers than others .
note : Some monoclonal antibody antibodies used to treat cancer are referred to as targeted therapy because they have a specific target on a cancer cell that they aim to find, bind to, and attack. But other monoclonal antibody antibodies act like immunotherapy because they make the immune arrangement respond better to allow the consistency to find and attack cancer cells more effectively .
What mAbs are made of
monoclonal antibodies are man-made proteins that act like human antibodies in the immune arrangement. There are 4 different ways they can be made and are named based on what they are made of.
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- Murine: These are made from mouse proteins and the names of the treatments end in -omab.
- Chimeric: These proteins are a combination of part mouse and part human and the names of the treatments end in -ximab.
- Humanized: These are made from small parts of mouse proteins attached to human proteins and the names of the treatments end in -zumab
- Human: These are fully human proteins and the names of the treatments end in -umab.
Types of mAbs used to treat cancer
Naked monoclonal antibodies
Naked mAbs are antibodies that have no drug or radioactive material attached to them. They work by themselves. These are the most park type of mAbs used to treat cancer. Most bare mAbs attach to antigens on cancer cells, but some work by binding to antigens on other, non-cancerous cells, or evening free-floating proteins. naked mAbs can work in different ways .
- Some boost a person’s immune response against cancer cells by attaching to them and acting as a marker for the body’s immune system to destroy them. An example is alemtuzumab (Campath®), which is used to treat some patients with chronic lymphocytic leukemia (CLL). Alemtuzumab binds to the CD52 antigen, which is found on cells called lymphocytes (which include the leukemia cells). Once attached, the antibody attracts immune cells to destroy these cells.
- Some naked mAbs boost the immune response by targeting immune system checkpoints. (See Immune Checkpoint Inhibitors and Their Side Effects.)
- Other naked mAbs work mainly by attaching to and blocking antigens on cancer cells (or other nearby cells) that help cancer cells grow or spread. For example, trastuzumab (Herceptin) is an antibody against the HER2 protein. Breast and stomach cancer cells sometimes have large amounts of this protein on their surface. When HER2 is activated, it helps these cells grow. Trastuzumab binds to these proteins and stops them from becoming active.
Conjugated monoclonal antibodies
Conjugated mAbs are combined with a chemotherapy drug or a radioactive atom. These mAbs are used as a homing device to take one of these substances immediately to the cancer cells. The mAb circulates throughout the body until it can find and hook onto the target antigen. It then delivers the toxic message where it is needed most. This lessens the wrong to normal cells in other parts of the body. Conjugated mAbs are besides sometimes referred to as tagged, labeled, or affluent antibodies.
- Radiolabeled antibodies: Radiolabeled antibodies have small radioactive particles attached to them. Ibritumomab tiuxetan (Zevalin) is an example of a radiolabeled mAb. This is an antibody against the CD20 antigen, which is found on lymphocytes called B cells. The antibody delivers radioactivity directly to cancer cells. It is made of both an mAb drug (rituximab) and a radioactive substance (Yttrium-90). Treatment with this type of antibody is sometimes known as radioimmunotherapy (RIT). The drug and radiation are delivered directly to the target cells because the mAb looks for the target, then the radiation affects the target and nearby cells to a certain extent.
- Chemolabeled antibodies: These mAbs have powerful chemotherapy (or other) drugs attached to them. Examples include:
- Brentuximab vedotin (Adcetris), an antibody that targets the CD30 antigen (found on lymphocytes), attached to a chemo drug called MMAE.
- Ado-trastuzumab emtansine (Kadcyla, also called TDM-1), an antibody that targets the HER2 protein, attached to a chemo drug called DM1.
Bispecific monoclonal antibodies
These drugs are made up of parts of 2 unlike mAbs, meaning they can attach to 2 unlike proteins at the same time. An exemplar is blinatumomab ( Blincyto ), which is used to treat some types of leukemia. One region of blinatumomab attaches to the CD19 protein, which is found on some leukemia and lymphoma cells. Another part attaches to CD3, a protein found on immune cells called T cells. By binding to both of these proteins, this drug brings the cancer cells and immune cells together, which is thought to cause the immune system to attack the cancer cells .
Possible side effects of monoclonal antibodies
monoclonal antibodies are given intravenously ( injected into a vein ). The antibodies themselves are proteins, indeed giving them can sometimes cause something like an allergic reaction. This is more park while the drug is foremost being given. possible side effects can include :
- Low blood pressure
Compared with chemotherapy drugs, naked mAbs tend to have fewer dangerous slope effects. But they can still cause problems in some people. Some mAbs can have side effects that are related to the antigens they target. For case :
- Bevacizumab (Avastin) is an mAb that targets a protein called VEGF that affects tumor blood vessel growth. It can cause side effects such as high blood pressure, bleeding, poor wound healing, blood clots, and kidney damage.
- Cetuximab (Erbitux) is an antibody that targets a cell protein called EGFR, which is found on normal skin cells (as well as some types of cancer cells). This drug can cause serious rashes in some people.