Cell Death
165 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

Apoptosis is derived from the Greek word for '____________.'

falling off

Multicellular organisms need to regulate cell death to allow body structures to grow and develop __________.

correctly

During apoptosis, the process begins with the activation of ______ proteins.

procaspase

Apoptosis can be initiated by __________ signaling or intracellular signaling.

<p>extracellular</p> Signup and view all the answers

One of the morphological changes in apoptosis is ______ of the cell.

<p>shrinkage</p> Signup and view all the answers

The balance between cell proliferation and cell death is essential for maintaining __________.

<p>homeostasis</p> Signup and view all the answers

Programmed cell death is crucial for the removal of body structures that are no longer __________.

<p>required</p> Signup and view all the answers

Caspases are specialized intracellular ______ that play a crucial role in apoptosis.

<p>proteases</p> Signup and view all the answers

Cell death plays an important role in __________, as it helps eliminate damaged or unwanted cells.

<p>disease</p> Signup and view all the answers

In apoptosis, ______ fragmentation is a characteristic morphological feature.

<p>nuclear</p> Signup and view all the answers

The initiator and executioner caspases are two classes of ______ involved in the apoptotic process.

<p>caspases</p> Signup and view all the answers

Apoptosis is essential for processes such as the development of a mouse’s paw and a tadpole losing its __________.

<p>tail</p> Signup and view all the answers

In multicellular organisms, precise control over the size of __________ and organs is necessary.

<p>tissues</p> Signup and view all the answers

Caspases are ______: they cleave key cell proteins.

<p>proteinases</p> Signup and view all the answers

The ______ pathway is mediated by death receptors.

<p>extrinsic</p> Signup and view all the answers

During apoptosis, pro-caspase 8 is converted to ______.

<p>activated caspase 8</p> Signup and view all the answers

The ______ family includes both anti-apoptotic and pro-apoptotic members.

<p>Bcl-2</p> Signup and view all the answers

The ______ activates executioner caspases after receiving apoptotic signals.

<p>apoptosome</p> Signup and view all the answers

Cad is a downstream target of ______.

<p>caspases</p> Signup and view all the answers

Adaptor protein ______ recruits initiator caspases in the extrinsic pathway.

<p>FADD</p> Signup and view all the answers

Cell ______ is the process of increasing cell numbers.

<p>division</p> Signup and view all the answers

______ is the process of programmed cell death.

<p>Apoptosis</p> Signup and view all the answers

The ______ pathway of apoptosis is activated by mitochondrial signals.

<p>intrinsic</p> Signup and view all the answers

DNA damage can trigger apoptosis via the ______ protein.

<p>p53</p> Signup and view all the answers

Pathological cell death is referred to as ______.

<p>Necrosis</p> Signup and view all the answers

Pro-apoptotic proteins such as Bax and Bak belong to the ______ family.

<p>Bcl-2</p> Signup and view all the answers

Cells that have been infected by ______ need to be eliminated by apoptosis.

<p>pathogens</p> Signup and view all the answers

The process of apoptosis prevents the survival of cells with ______ DNA.

<p>damaged</p> Signup and view all the answers

______ cells can initiate an autoimmune response if not eliminated.

<p>Lymphocytes</p> Signup and view all the answers

In apoptosis, the cell experiences ______ condensation.

<p>cellular</p> Signup and view all the answers

In necrosis, cellular membranes ______ leading to inflammation.

<p>rupture</p> Signup and view all the answers

The p53 protein is a tumour suppressor that is mutated in more than ______% of cancers.

<p>50</p> Signup and view all the answers

Apoptosis plays an important role in preventing ______, but is not always successful.

<p>cancer</p> Signup and view all the answers

In cancer cells, the cues that would trigger ______ have failed.

<p>apoptosis</p> Signup and view all the answers

The survival of lymphocytes that would normally have ______ is a characteristic of cancer.

<p>died</p> Signup and view all the answers

The cell develops resistance to ______, which is a common factor in cancer progression.

<p>apoptosis</p> Signup and view all the answers

The p53 protein is a tumour suppressor that promotes __________ following DNA damage.

<p>apoptosis</p> Signup and view all the answers

When apoptosis is inhibited, the result can be the __________ of lymphocytes that would normally have died.

<p>survival</p> Signup and view all the answers

Mutations in p53 lead to a failure to promote __________ or cell cycle arrest.

<p>apoptosis</p> Signup and view all the answers

Cells can develop __________ to apoptosis, which is a critical aspect of cancer development.

<p>resistance</p> Signup and view all the answers

Apoptosis is initiated by the activation of ______ proteins.

<p>procaspase</p> Signup and view all the answers

Caspases are specialized intracellular ______ that cleave specific proteins during apoptosis.

<p>proteases</p> Signup and view all the answers

Necrosis causes an inflammatory response but ______ does not.

<p>apoptosis</p> Signup and view all the answers

To eliminate lymphocytes that would trigger an ______ response

<p>autoimmune</p> Signup and view all the answers

Apoptosis is known as ______ cell death or programmed cell death.

<p>physiological</p> Signup and view all the answers

Necrosis is a type of cell death that is ______ resulting from damage or injury.

<p>pathological</p> Signup and view all the answers

During apoptosis, the cell membranes remain ______ and do not rupture.

<p>intact</p> Signup and view all the answers

The process of apoptosis helps to get rid of ______ cells that are no longer needed.

<p>unwanted</p> Signup and view all the answers

In apoptosis, the cellular DNA undergoes ______ fragmentation.

<p>ladder-like</p> Signup and view all the answers

In necrosis, damage leads to cellular ______, which results in inflammation.

<p>swelling</p> Signup and view all the answers

Apoptosis is essential for the removal of cells that may have ______ DNA.

<p>damaged</p> Signup and view all the answers

Programmed cell death is essential for the removal of body structures that are no longer __________.

<p>required</p> Signup and view all the answers

Caspase-activated DNase (CAD) is responsible for cutting DNA between __________.

<p>nucleosomes</p> Signup and view all the answers

The initiator caspase in the extrinsic pathway is __________.

<p>caspase 8</p> Signup and view all the answers

The intrinsic pathway of apoptosis involves the release of __________ from the mitochondria.

<p>cytochrome c</p> Signup and view all the answers

In the extrinsic pathway, adaptor protein __________ recruits initiator caspases.

<p>FADD</p> Signup and view all the answers

The protein __________ is known to inhibit apoptosis and is associated with many tumors.

<p>Bcl-2</p> Signup and view all the answers

During apoptosis, the cell's nuclear lamins undergo __________.

<p>breakdown</p> Signup and view all the answers

The clustering of __________ triggers a conformational change that activates procaspases.

<p>initiator procaspases</p> Signup and view all the answers

Pro-apoptotic proteins such as __________ lead to the activation of executioner caspases.

<p>Bax</p> Signup and view all the answers

In the DISC, __________ is the ligand that binds to the death receptors.

<p>FasL</p> Signup and view all the answers

What morphological change is NOT typically associated with apoptosis?

<p>Organelle proliferation</p> Signup and view all the answers

Which statement accurately represents a difference between apoptosis and necrosis?

<p>Apoptosis does not trigger an inflammatory response, whereas necrosis does.</p> Signup and view all the answers

Which component is essential for the apoptosis process?

<p>Proteolytic cleavage by caspases</p> Signup and view all the answers

Which stage is NOT part of the mechanism of apoptosis?

<p>DNA repair process</p> Signup and view all the answers

What is a characteristic feature of the caspase proteins involved in apoptosis?

<p>They cleave proteins at specific aspartic acids.</p> Signup and view all the answers

What is the role of the p53 protein in relation to apoptosis when mutated?

<p>It prevents apoptosis and allows damaged cells to survive.</p> Signup and view all the answers

Which statement correctly explains the relationship between apoptosis and cancer?

<p>Cancer cells often arise when the signals for apoptosis fail to trigger.</p> Signup and view all the answers

What characteristic is exhibited by lymphocytes in the presence of cancer?

<p>They survive despite signals indicating they should die.</p> Signup and view all the answers

How does a mutation in p53 affect its role as a tumor suppressor?

<p>It allows for unregulated cell division in cancer.</p> Signup and view all the answers

Which process is NOT typically associated with cancer cell development?

<p>Overproduction of apoptotic signals.</p> Signup and view all the answers

Why is precise control over cell death important for multicellular organisms?

<p>To remove unnecessary body structures</p> Signup and view all the answers

What is a characteristic effect of apoptosis as opposed to necrosis?

<p>Apoptosis involves membrane integrity preservation</p> Signup and view all the answers

Which of the following describes a consequence of malfunctioning apoptosis?

<p>Potential for autoimmune responses</p> Signup and view all the answers

What role do caspases play in apoptosis?

<p>They cleave specific proteins to execute cell death</p> Signup and view all the answers

What initiates the process of apoptosis in cells?

<p>Extracellular and intracellular signals</p> Signup and view all the answers

How does cell death contribute to homeostasis within tissues?

<p>By balancing cell proliferation and apoptosis</p> Signup and view all the answers

What is a likely effect of dysregulated apoptosis in cancer development?

<p>Survival of damaged cells that should undergo death</p> Signup and view all the answers

Which factor is commonly associated with apoptosis in the context of pathogen-infected cells?

<p>Elimination of infected cells</p> Signup and view all the answers

What is one of the distinct characteristics of apoptosis?

<p>Intact membranes</p> Signup and view all the answers

Which of the following is a function of apoptosis?

<p>Eliminating cells with damaged DNA</p> Signup and view all the answers

What differentiates necrosis from apoptosis?

<p>Necrosis affects whole areas of tissue</p> Signup and view all the answers

What role does apoptosis play in organ development?

<p>It helps shape the organs by removing unneeded cells</p> Signup and view all the answers

Which of the following descriptions applies to necrosis?

<p>It often leads to lysis and inflammation</p> Signup and view all the answers

What initiates apoptosis in response to cellular damage?

<p>DNA damage signals</p> Signup and view all the answers

In what context is apoptosis particularly important?

<p>For maintaining organ size and shape</p> Signup and view all the answers

Which type of cell death is described as resulting from injury?

<p>Necrosis</p> Signup and view all the answers

Which component is part of the death-inducing signaling complex (DISC)?

<p>FADD</p> Signup and view all the answers

What initiates the intrinsic pathway of apoptosis?

<p>Activation of Bcl-2 family members</p> Signup and view all the answers

What role does cytochrome c play in apoptosis?

<p>It acts as a pro-apoptotic protein.</p> Signup and view all the answers

Which statement describes an effect of high levels of Bcl-2 in cells?

<p>Decreased apoptosis contributes to tumor formation</p> Signup and view all the answers

What is the primary function of caspase-activated DNase (CAD)?

<p>Cutting DNA between nucleosomes</p> Signup and view all the answers

What triggers the activation of initiator procaspases in the extrinsic pathway?

<p>Adaptor proteins</p> Signup and view all the answers

Which molecule is directly associated with the activation of executioner caspases in the intrinsic pathway?

<p>Apaf-1</p> Signup and view all the answers

Which protein is known to be a pro-apoptotic member of the Bcl-2 family?

<p>Bax</p> Signup and view all the answers

How does the extrinsic pathway of apoptosis differ from the intrinsic pathway?

<p>It involves death receptor signaling.</p> Signup and view all the answers

What occurs as a result of deprivation of survival factors in cells?

<p>Initiation of apoptosis</p> Signup and view all the answers

Which of the following statements accurately describes a characteristic of apoptosis?

<p>Caspases cleave proteins at specific aspartic acid residues.</p> Signup and view all the answers

What is one key difference between apoptosis and necrosis?

<p>Apoptosis avoids leaking intracellular contents, while necrosis does not.</p> Signup and view all the answers

What role do initiator caspases play in the apoptosis mechanism?

<p>They activate executioner caspases, which carry out cell death.</p> Signup and view all the answers

Which morphological change is a typical feature observed during apoptosis?

<p>Chromatin condensation and nuclear fragmentation.</p> Signup and view all the answers

What protein family is primarily involved in the execution of apoptosis through their proteolytic functions?

<p>Caspases.</p> Signup and view all the answers

What is the role of the p53 protein in cancerous cells?

<p>Inhibits cell cycle arrest due to DNA damage</p> Signup and view all the answers

Which of the following statements best describes the relationship between apoptosis and cancer progression?

<p>Failed apoptosis cues contribute to the formation of cancer cells</p> Signup and view all the answers

What is a consequence of p53 mutation in relation to lymphocyte survival?

<p>Survival of lymphocytes that should normally die</p> Signup and view all the answers

Which process occurs when cancer cells develop resistance to apoptosis?

<p>Failure to eliminate damaged or mutated cells</p> Signup and view all the answers

How does the over-expression of regulatory proteins relate to cancer cell behavior?

<p>Promotes the dismantling of apoptotic machinery</p> Signup and view all the answers

What role does apoptosis play in multicellular organisms?

<p>It helps in the removal of excess cells and unnecessary structures.</p> Signup and view all the answers

In what scenario does necrosis primarily occur compared to apoptosis?

<p>It is usually a consequence of external injury or damage.</p> Signup and view all the answers

What is a significant consequence when apoptosis does not function correctly?

<p>Increased risk of chronic diseases.</p> Signup and view all the answers

How does apoptosis contribute to the development of multicellular organisms?

<p>By assisting in tissue remodeling during growth.</p> Signup and view all the answers

Which statement correctly identifies an important function of caspases in apoptosis?

<p>They cleave specific proteins to facilitate cell death.</p> Signup and view all the answers

What is the relationship between apoptosis and homeostasis in the body?

<p>Apoptosis and cell proliferation both contribute to maintaining homeostasis.</p> Signup and view all the answers

What signaling mechanisms are involved in initiating apoptosis?

<p>Both intracellular and extracellular signaling pathways.</p> Signup and view all the answers

Which statement best distinguishes apoptosis from necrosis?

<p>Apoptosis requires ATP, while necrosis does not.</p> Signup and view all the answers

Which option is NOT a type of necrosis?

<p>Apoptotic necrosis</p> Signup and view all the answers

Which of the following does NOT represent a consequence of apoptosis?

<p>Promotion of chronic inflammation.</p> Signup and view all the answers

Which of the following is a characteristic of necrosis?

<p>Lysis resulting in inflammation</p> Signup and view all the answers

What can trigger the process of apoptosis within a cell?

<p>Damage to cellular DNA</p> Signup and view all the answers

Which statement regarding T-lymphocytes is accurate?

<p>They promote apoptosis in virally infected cells.</p> Signup and view all the answers

Which of the following differentiates the outcomes of apoptosis and necrosis?

<p>Apoptosis leads to no inflammatory response, while necrosis causes inflammation.</p> Signup and view all the answers

What is a primary function of apoptosis during development?

<p>To reduce the number of cells in certain body structures</p> Signup and view all the answers

Which initiator caspase is involved in the extrinsic pathway of apoptosis?

<p>Caspase-8</p> Signup and view all the answers

Which protein family members are generally known for their pro-apoptotic roles?

<p>Bax and Bak</p> Signup and view all the answers

What occurs in the intrinsic pathway to initiate apoptosis?

<p>Release of cytochrome c</p> Signup and view all the answers

What is a key function of adaptor proteins in apoptosis signaling?

<p>Facilitate receptor clustering</p> Signup and view all the answers

Which of the following statements about Bcl-2 is correct?

<p>High levels of Bcl-2 inhibit apoptosis.</p> Signup and view all the answers

How do initiator caspases differ from executioner caspases?

<p>Initiator caspases are activated first and activate the downstream executioners.</p> Signup and view all the answers

What is the effect of deprivation of survival factors on cells?

<p>Cells undergo apoptosis.</p> Signup and view all the answers

Which statement best describes the role of p53 in apoptosis?

<p>P53 enhances the activity of pro-apoptotic proteins.</p> Signup and view all the answers

Which morphological change is characteristic of apoptosis?

<p>Membrane blebbing</p> Signup and view all the answers

How do caspases contribute to the process of apoptosis?

<p>They cleave specific proteins</p> Signup and view all the answers

What is a key distinction between apoptosis and necrosis?

<p>Apoptosis does not cause inflammation</p> Signup and view all the answers

What initiates the apoptotic cascade in cells?

<p>Activation of procaspase proteins</p> Signup and view all the answers

Which of the following is NOT a typical feature of apoptosis?

<p>Cellular rupture</p> Signup and view all the answers

What is the primary function of the p53 protein in normal cells regarding apoptosis?

<p>It promotes apoptosis or cell cycle arrest following DNA damage.</p> Signup and view all the answers

Which of the following statements accurately describes a consequence of p53 mutation in cancer cells?

<p>p53 mutations lead to a failure to promote cell cycle arrest.</p> Signup and view all the answers

Which factor contributes to the development of cancer in relation to apoptosis?

<p>Failure of cues that trigger apoptosis in cancer cells.</p> Signup and view all the answers

What is one possible outcome when apoptosis is inhibited in cells?

<p>Lymphocytes that should die may survive and proliferate.</p> Signup and view all the answers

Which of the following processes is NOT associated with the failure of apoptosis in cancer development?

<p>Activation of executioner caspases.</p> Signup and view all the answers

What is an essential role of caspases in apoptosis?

<p>They cleave key cell proteins</p> Signup and view all the answers

Which initiator caspase is involved in the extrinsic pathway?

<p>Caspase 8</p> Signup and view all the answers

What forms the death-inducing signaling complex (DISC)?

<p>Ligand, Fas, FADD, procaspase-8</p> Signup and view all the answers

Which protein is released from the mitochondria to activate the intrinsic pathway?

<p>Cytochrome c</p> Signup and view all the answers

Increased levels of which Bcl-2 family member are associated with cancer?

<p>Bcl-2</p> Signup and view all the answers

What is the primary function of the apoptosome?

<p>To activate executioner caspases</p> Signup and view all the answers

What consequence arises from the deprivation of survival factors in cells?

<p>Apoptosis</p> Signup and view all the answers

What triggers the activation of procaspases in the apoptotic signaling process?

<p>Adaptor protein conformational changes</p> Signup and view all the answers

Which of the following is a pro-apoptotic member of the Bcl-2 family?

<p>Bad</p> Signup and view all the answers

Which signaling pathway primarily involves death receptors?

<p>Extrinsic pathway</p> Signup and view all the answers

What is the primary characteristic that differentiates apoptosis from necrosis?

<p>Apoptosis has intact cell membranes</p> Signup and view all the answers

Which of the following best describes apoptosis?

<p>Programmed and controlled cell death</p> Signup and view all the answers

During which process is cellular DNA fragmented in a ladder-like pattern?

<p>Apoptosis</p> Signup and view all the answers

What role does apoptosis play in the immune system?

<p>Eliminates lymphocytes that trigger autoimmune responses</p> Signup and view all the answers

What is one difference between coagulating necrosis and liquifying necrosis?

<p>Liquifying necrosis is often seen with infections</p> Signup and view all the answers

Why do multicellular organisms need to regulate cell death?

<p>To manage the survival of cells with damaged DNA</p> Signup and view all the answers

Which of the following is NOT a known function of apoptosis?

<p>Divides cells into two identical daughter cells</p> Signup and view all the answers

What happens to the cell during necrosis?

<p>Cellular swelling occurs</p> Signup and view all the answers

What is one major reason multicellular organisms need to regulate cell death?

<p>To allow body structures to grow and develop correctly.</p> Signup and view all the answers

Which mechanism initiates apoptosis?

<p>Extracellular and intracellular signaling.</p> Signup and view all the answers

What happens when apoptosis goes wrong?

<p>Cellular structures develop erratically.</p> Signup and view all the answers

What distinguishes apoptosis from necrosis?

<p>Apoptosis is a controlled process whereas necrosis is caused by injury or disease.</p> Signup and view all the answers

Which of the following is an important molecule associated with apoptosis?

<p>Caspases.</p> Signup and view all the answers

How does apoptosis contribute to homeostasis?

<p>By regulating the balance of cell proliferation and cell death.</p> Signup and view all the answers

What is the result of inhibited apoptosis in multicellular organisms?

<p>A surplus of unwanted cells.</p> Signup and view all the answers

Study Notes

Cell Death

  • Cell death is crucial for life, vital for development and homeostasis.
  • Apoptosis is a form of programmed cell death, also known as physiological or normal cell death, and helps in getting rid of unwanted cells.
  • Apoptosis is "Greek for falling off."
  • Apoptosis differs from necrosis, a form of pathological cell death, which is caused by damage or injury.
  • Necrosis results in cell swelling and rupture of membranes.
  • Apoptosis involves cellular condensation, intact membranes, requiring ATP, and is phagocytosed with no tissue reaction or inflammation.
  • Apoptosis is a regulated process resulting in organized DNA fragmentation, while necrosis results in random DNA fragmentation.
  • Apoptosis is triggered at the individual cell level, whereas necrosis affects whole areas of tissue.
  • Cell death's importance lies in shaping organs during development and maintaining homeostasis.

Learning Outcomes

  • Students should describe the importance of cell death.
  • They should differentiate between types of cell death.
  • Students should interpret cell death signaling pathways.
  • The key molecules involved in cell death should be identified.
  • The role of cell death in disease needs to be explained.

Apoptosis versus Necrosis

  • Apoptosis is a controlled or programmed process of cellular suicide.
  • Necrosis is a uncontrolled or pathological process resulting from damaged cells.
  • Apoptosis results in a condensation of the cell and leaves intact membranes, and no inflammation.
  • Necrosis involves cell swelling and rupture, leading to subsequent inflammation.
  • The breakdown of DNA in apoptosis is organized, whereas in necrosis, the process is random.

Types of Necrosis

  • Coagulative necrosis is a type of tissue necrosis characterized by the preservation of the basic tissue architecture, typically seen after ischemia or infarction, particularly in the heart and kidneys.
  • Liquefactive necrosis, on the other hand, involves the transformation of tissues into a liquid viscous mass, often occurring due to bacterial infections or brain damage, resulting in pus formation.

Apoptosis Morphology

  • Features include cell shrinkage, organelle reduction, mitochondrial leakage, chromatin condensation, nuclear fragmentation, and membrane blebbing and changes.

Apoptosis Signaling

  • Apoptosis signaling has two pathways: intrinsic and extrinsic.
  • The extrinsic pathway of apoptosis primarily involves the activation of death receptors located on the cell membrane, which, upon clustering, initiate a signaling cascade leading to programmed cell death. This process is often triggered by external signals such as cytokines or ligands.
  • Conversely, the intrinsic pathway is mediated by the mitochondria and is activated in response to internal cellular stress, such as DNA damage or oxidative stress. This pathway involves the release of pro-apoptotic factors from the mitochondria, which then activate caspases, ultimately leading to cell death.

Apoptosis and Procaspases

  • Apoptosis involves specialized intracellular proteases called caspases.
  • Caspases cleave specific amino acid sequences in proteins.
  • They are synthesized as inactive procaspases and require activation.
  • Procaspases are inactive precursors of caspases that play critical roles as initiators and executioners in the apoptosis pathway.

Caspase Cascade

  • Caspase activation proceeds in a cascade.
  • The active caspases initiate a cascade of activating downstream targets.

Caspase Targets

  • Caspases cleave key cell proteins like DNAse, nuclear lamins, and actin-digesting enzymes.
  • This leads to the fragmentation of cellular structures like DNA and the nucleus.
  • This eventually leads to cytoskeletal disassembly.

Caspase-activated DNase (CAD)

  • CAD is involved in the cutting of DNA between nucleosomes.
  • Active CAD is activated by executioner caspases.

Extrinsic Pathway Details

  • This pathway is initiated from outside the cell.
  • Death receptors such as Fas and TNF are involved.
  • Ligands bind to these receptors, leading to the formation of the death-inducing signaling complex (DISC).
  • Caspase 8 is a key component of the extrinsic apoptosis pathway, which is triggered by death receptors on the cell surface. It acts as an initiator caspase, being one of the first to be activated in response to death signals. Once activated, Caspase 8 not only cleaves and activates downstream effector caspases, such as Caspase 3 and Caspase 7, but it also plays a role in amplifying the apoptotic signal within the cell. This makes Caspase 8 crucial for the orderly and efficient dismantling of the cell during apoptosis, contributing to the overall regulation and execution of programmed cell death processes.

Intrinsic Pathway Details

  • This pathway is activated from inside the cell.
  • The Bcl-2 family proteins play a crucial regulatory role in the apoptosis pathway, influencing cell survival and death decisions.
  • The release of cytochrome c from the mitochondria serves as a crucial event in the intrinsic apoptosis pathway. This release indicates cellular stress or damage and subsequently leads to the activation of Apaf-1, which facilitates the recruitment of Caspase 9, further propagating the apoptotic signal.
  • Apoptotic protease activating factor-1 (APAF-1) is a crucial regulatory protein that plays an essential role in the intrinsic apoptosis pathway, acting as a key initiator in the activation of caspases.

Cellular Level Death

  • Death is necessary for life at the cellular level
  • The importance for multicellular organisms is to remove unwanted cells, for development, and maintenance of homeostasis.

P53

  • The p53 protein is a tumour suppressor that responds to DNA damage.
  • It plays a role in apoptosis and cell cycle arrest.
  • Mutations in the p53 tumor suppressor gene are prevalent across various types of cancers, frequently leading to a diminished ability of cells to undergo apoptosis in response to DNA damage, thus allowing damaged cells to survive and proliferate.

Bcl-2 Family

  • These proteins control the intrinsic pathway of apoptosis.
  • Bcl-2 family proteins are central to the regulation of the apoptotic process, as they include both anti-apoptotic members, which inhibit cell death, and pro-apoptotic members, which facilitate apoptosis.
  • This uncontrolled growth may result in various conditions, including cancer, where cells reproduce without the normal regulatory checks and balances.

Cancer and Apoptosis

  • Apoptosis can be linked to cancer or tumor development if uncontrolled cell death does not occur appropriately.
  • Cancer cells may evade apoptosis or exhibit uncontrolled proliferation due to failure in apoptosis regulation.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Quiz Team

Related Documents

Description

This quiz explores the essential concepts of cell death, focusing on apoptosis and necrosis. Students will learn the differences between these processes, their significance in development and homeostasis, and the physiological implications of programmed cell death. Understanding these mechanisms is crucial for grasping broader biological principles.

More Like This

Cell Death: Necrosis and Apoptosis
32 questions
Cell Death: Necrosis and Apoptosis
32 questions
Use Quizgecko on...
Browser
Browser