Cell Communication and Signaling

These flashcards cover key vocabulary terms and concepts related to cell communication and signaling based on the lecture notes.

Ligand

A molecule that binds another specific molecule.

Receptor

A protein on a cell that interacts with ligands.

Target Cell

Cells that have receptors for specific signaling molecules.

Local Signaling

Signals that affect nearby cells.

Long-Distance Signaling

Signals that travel through the bloodstream to affect distant cells.

Signal Reception

The first stage of signal transduction where the receptor recognizes and binds the ligand.

Cell-Surface Receptors

Receptors located on the plasma membrane of the cell.

Intracellular Receptors

Receptors found in the cytoplasm or nucleus that interact with ligands that can pass through the membrane.

G-Protein Coupled Receptors (GPCRs)

A family of proteins that translate extracellular signals into cellular responses.

Receptor Tyrosine Kinases

Receptors that transfer phosphate from ATP to tyrosine residues on proteins.

Ligand-Gated Ion Channels

Receptors that change their shape to allow ions to enter or exit the cell.

Apoptosis

Programmed cell death necessary for development and cellular homeostasis.

Signal Transduction

The process by which a cell responds to substances in its environment through receptor-ligand interactions.

Phosphorylation Cascade

A series of chemical reactions during cell signaling where enzymes activate each other in sequence.

Second Messengers

Small molecules that relay signals received from receptors on the cell surface.

Cyclic AMP (cAMP)

A second messenger important in many biological processes.

Calcium Ions (Ca2+)

A vital second messenger that participates in many signaling pathways.

Scaffolding Proteins

Proteins that enhance the efficiency of signaling pathways.

Termination of Signal

The process that reverses signaling molecules' effects to reset the signaling pathway.

Specificity of Cell Signaling

The mechanism through which different cells respond differently to the same signal.

Cellular Responses

The outcomes of signal transduction pathways affecting cellular activity.

Transcription Factor

A protein that binds to DNA to regulate gene expression.

Dimerization

The process by which two receptor proteins bind together to activate their function.

Phospholipase C

An enzyme that catalyzes the cleavage of phospholipids and plays a role in signaling.

Increased Ca2+ Concentration

An outcome of signaling that can activate various pathways inside the cell.

Endocrine Signaling

Long-distance signaling through hormones traveling through the bloodstream.

Auto-Crime Signaling

A type of local signaling where a cell responds to its own signals.

Juxtacrine Signaling

A type of cell communication that requires direct contact between cells.

Paracrine Signaling

A type of signaling that affects nearby cells.

Synaptic Signaling

A type of signaling that occurs in neurons when neurotransmitters are released.

Activation of Cellular Response

The end result of signaling pathways leading to changes in cell activity.

Protein Kinases

Enzymes that phosphorylate proteins, altering their activity.

Protein Phosphatases

Enzymes that remove phosphate groups from proteins, often reversing their activation.

Caspases

Proteases that play a pivotal role in executing apoptosis.

Lipid-Derived Second Messengers

Messengers derived from membrane lipids that mediate signaling.

GDP (Guanosine Diphosphate)

A nucleotide that, when bound to a protein, indicates that the protein is inactive.

GTP (Guanosine Triphosphate)

A nucleotide that activates G-proteins and initiates signaling pathways.

Extracellular Fluid

Fluid outside the cells that contains ligands and signaling molecules.

Endoplasmic Reticulum (ER)

An organelle involved in calcium storage and signaling.

Nucleus

The organelle that houses genetic material and is a site for transcription regulations.

Fate of the Cell

The outcome determined by the types of signals received and the responses activated.

Mitochondrion

An organelle involved in energy production and regulation of cellular signals.

Signal Amplification

The process by which a small initial signal produces a large response.

Signal Modulation

Adjustments made within signaling pathways that enhance or suppress responses.

Membrane Receptor

A type of receptor located on the plasma membrane that responds to external signals.

Transduction Pathway

The series of steps through which a signal is transmitted within a cell.

Cellular Context

The specific conditions and environment of a cell that affect its responses.

Molecular Interactions

The physical interaction between molecules that can lead to cellular responses.

Signal Recognition

The ability of cells to detect signaling molecules through receptors.

Transcription Regulation

Control of gene expression in response to signals received.

Ion Channel Regulation

Mechanisms that control the opening and closing of ion channels in response to signals.

Multistep Pathways

Signaling mechanisms that involve multiple reactions and proteins.

Specificity of Response

The targeted action of signaling pathways on particular proteins or gene expressions.

Cell Cycle Regulation

Control mechanisms that ensure proper cell division and response to signals.

Pathway Crosstalk

Interaction between different signaling pathways that influences cellular responses.

Cytoskeleton

A structural framework that may influence signaling pathways and cellular responses.

Nuclear Signal Transduction

Signaling pathways that lead to changes within the nucleus.

Apoptotic Signal Pathway

The signaling pathway leading to programmed cell death.

Feedback Mechanisms

Processes that regulate signaling pathways by providing feedback from outcomes.

Receptor Affinity

The strength of binding between a receptor and its ligand.

Negative Feedback

A control mechanism where a process inhibits its own production.

Positive Feedback

A control mechanism where a process enhances its own production.

Extrinsic Signals

Signals that originate from outside of the cell.

Intrinsic Signals

Signals that originate from within the cell.

Cell Signaling Pathways

Complex networks of interactions that transmit signals from receptors to cellular effects.

Adaptive Responses

Changes in cellular function in response to prolonged signaling.

Signal Diversification

The ability of a signaling pathway to stimulate multiple cellular responses.

Receptor Modulation

The changes in receptor availability or sensitivity due to signaling.

Cellular Communication

The process by which cells send and receive signals to coordinate actions.

Hormonal Signaling

A type of long-distance signaling mediated by hormones released into the bloodstream.

Physiological Effects

Changes in organism functioning resulting from cellular signaling pathways.

Biodiversity of Signal Pathways

The variety of different signaling pathways present in different cell types.

Resilience in Signaling

The ability of a cell to maintain function despite changes in signaling conditions.

Developmental Signaling

Signaling pathways that control the development and differentiation of cells.

Nutrient Signaling

Signaling mechanisms that respond to changes in nutrient availability.

Cell Survival Signals

Signals that promote cell growth and prevent apoptosis.

Inter-cellular Coordination

How cells synchronize their functions through signaling mechanisms.

Neurotransmitter Functions

Chemical signals that transmit information across a synapse.

Disruption of Signaling

Aberrations in signaling pathways that can lead to diseases.

Integrative Signaling

Combined effects of multiple signaling pathways on cellular responses.