What is apoptosis?
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Mastering this deck will enhance your understanding of how cells regulate their lifespan, which is crucial for comprehending developmental processes, immune responses, and disease mechanisms such as cancer. This knowledge enables you to analyze the balance between cell survival and death in biological systems and informs potential therapeutic strategies.
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| 1 | What is apoptosis? |
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Processes of programmed cell death, its significance in development and disease prevention.
Apoptosis is a form of programmed cell death involving an orderly sequence of cellular events leading to cell dismantling without triggering inflammation, crucial for development and tissue homeostasis. |
| Think of it as the cell's self-destruct sequence. |
| 2 | Name two morphological features characteristic of apoptotic cells. | Features include cell shrinkage and membrane blebbing, along with nuclear fragmentation and chromatin condensation. | Visualize the cell shrinking and forming bubble-like protrusions. |
| 3 | What are caspases and what role do they play in apoptosis? | Caspases are a family of protease enzymes that execute apoptosis by cleaving specific cellular substrates, leading to cell dismantling. | Caspases act as the 'executioners' of apoptosis. |
| 4 | Differentiate between intrinsic and extrinsic pathways of apoptosis. | The intrinsic pathway is triggered by internal signals such as DNA damage, involving mitochondrial release of cytochrome c, while the extrinsic pathway is initiated by external death signals binding to death receptors on the cell surface. | Internal vs. external: Think mitochondria vs. death receptors. |
| 5 | Which mitochondrial protein is pivotal in initiating the intrinsic apoptosis pathway? | Cytochrome c, which, when released into the cytoplasm, helps form the apoptosome, activating caspases. | Remember: cytochrome c is also involved in respiration. |
| 6 | What is the role of Bcl-2 family proteins in apoptosis? | They regulate mitochondrial membrane permeability; some (like Bcl-2) inhibit apoptosis, while others (like Bax) promote it. | Think of Bcl-2 as the cell’s 'brake' and Bax as the 'accelerator.' |
| 7 | What is the significance of apoptosis during embryonic development? | Apoptosis shapes tissues and organs by removing unnecessary or misplaced cells, such as the separation of fingers and toes in limb development. | It's a sculptor's tool for shaping the body. |
| 8 | How does apoptosis prevent the development of cancer? | By eliminating damaged or abnormal cells that could potentially proliferate uncontrollably, apoptosis acts as a tumor suppressor mechanism. | Cell suicide as a safeguard against cancer. |
| 9 | What is necrosis, and how does it differ from apoptosis? | Necrosis is accidental cell death caused by injury, leading to cell swelling, membrane rupture, and inflammation, unlike apoptosis which is controlled and non-inflammatory. | Necrosis is messy; apoptosis is orderly. |
| 10 | What role do death receptors play in apoptosis? | Death receptors are cell surface proteins that initiate the extrinsic apoptosis pathway upon binding specific ligands, such as Fas ligand. | Think of them as cellular 'death switches.' |
| 11 | Name an example of a disease associated with defective apoptosis. | Cancer is a common example, where failure of apoptosis allows abnormal cells to survive and proliferate. | When the self-destruct system fails, tumors can form. |
| 12 | How can excessive apoptosis contribute to neurodegenerative diseases? | Excessive apoptosis leads to the loss of neurons, contributing to diseases like Alzheimer’s and Parkinson’s. | Too much cell death can be as harmful as too little. |
| 13 | What is the role of p53 in apoptosis? | p53 is a tumor suppressor protein that responds to DNA damage by inducing cell cycle arrest or apoptosis to prevent propagation of mutations. | p53 is known as the 'guardian of the genome.' |
| 14 | Describe how the process of apoptosis can be experimentally detected. | Methods include TUNEL assay, Annexin V staining, and observing characteristic morphological changes under microscopy. | Look for DNA fragmentation or membrane phosphatidylserine exposure. |
| 15 | What is the significance of phosphatidylserine externalization in apoptosis? | Externalization of phosphatidylserine on the cell membrane signals phagocytes to engulf and remove apoptotic cells. | It’s like a 'eat me' signal. |
| 16 | Why is apoptosis considered a beneficial process in maintaining tissue homeostasis? | It removes damaged, old, or unnecessary cells in a controlled manner, preventing inflammation and maintaining healthy tissue function. | Balance of cell death and growth keeps tissues healthy. |
| 17 | What is the role of autophagy in relation to apoptosis? | Autophagy is a process of cellular self-digestion that can promote survival or lead to cell death, often interacting with apoptosis pathways during stress responses. | Autophagy is the cell's recycling system. |
| 18 | How do cancer cells evade apoptosis? | They often overexpress anti-apoptotic proteins like Bcl-2, mutate tumor suppressors like p53, or alter death receptor pathways to avoid cell death. | Cancer cells develop 'escape routes' from apoptosis. |
| 19 | What therapeutic strategies target apoptosis pathways in cancer treatment? | Strategies include drugs that inhibit anti-apoptotic proteins (e.g., Bcl-2 inhibitors) or activate death receptors to induce cell death in cancer cells. | Targeting the cell's self-destruct mechanisms to fight cancer. |
| 20 | What is anoikis, and why is it important? | Anoikis is apoptosis induced by detachment from the extracellular matrix, preventing detached cells from colonizing elsewhere, thus inhibiting metastasis. | Anchorage dependence as a tumor suppressor mechanism. |
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