The Raji cell is a lymphoblastoid cell with B-cell characteristics derived from a Burkitt’s lymphoma cell line. It has low affinity Fc receptors for binding immunoglobulin and high affinity receptors for binding complement.
What are the 5 steps of apoptosis?
apoptosis
- Cell shrinks.
- Cell fragments.
- Cytoskeleton collapses.
- Nuclear envelope disassembles.
- Cells release apoptotic bodies.
What cells can induce apoptosis?
Killer lymphocytes (discussed in Chapter 24), for example, can induce apoptosis by producing a protein called Fas ligand, which binds to the death receptor protein Fas on the surface of the target cell.
What is the mechanism of apoptosis?
apoptosis, also called programmed cell death, in biology, a mechanism that allows cells to self-destruct when stimulated by the appropriate trigger. Apoptosis can be triggered by mild cellular injury and by various factors internal or external to the cell; the damaged cells are then disposed of in an orderly fashion.
Do Raji cells express CD20?
Raji-Null cells were developed from the human Raji cell line. Raji-Null cells constitutively express different antigens at their cell surface that can be targeted by specific antibodies, notably to induce antibody-dependent cellular cytotoxicity (ADCC). -Human CD20 is highly expressed by Raji cells.
Do Raji cells express Fc receptors?
Immune Complex–Mediated Diseases Raji cells have cell surface receptors for complement components C1q, C3b, C3bi, and C3d, but lack surface Ig; and their cell surface Fc IgG receptors are either of low affinity or few in number and do not interfere with the RIA.
What are the 4 stages of apoptosis?
To illustrate these apoptosis events and how to detect them, Bio-Rad has created a pathway which divides apoptosis into four stages: induction, early phase, mid phase and late phase (Figure 1).
What are the 4 stages of the cell cycle?
In eukaryotes, the cell cycle consists of four discrete phases: G1, S, G2, and M. The S or synthesis phase is when DNA replication occurs, and the M or mitosis phase is when the cell actually divides. The other two phases — G1 and G2, the so-called gap phases — are less dramatic but equally important.
What stimulates apoptosis?
Apoptosis can be activated by stimuli coming within the cell, including cell stressors, such as hypoxia or lack of nutrients, and agents that cause damage of DNA or other cell structures.
Which of the following proteins activates the mitochondrial pathway of apoptosis?
Activated BH3-only proteins or anti-IAP proteins can result in the activation of the intrinsic pathway of apoptosis. In response to DNA damage that cannot be repaired, the tumor suppressor protein p53 activates the expression of genes encoding BH3-only proteins (such as Puma).
What are three ways cells undergo apoptosis?
There are 3 different mechanisms by which a cell commits suicide by apoptosis.
- One generated by signals arising within the cell;
- another triggered by death activators binding to receptors at the cell surface: TNF-α Lymphotoxin. Fas ligand (FasL)
- A third that may be triggered by dangerous reactive oxygen species.
