Cell Signaling and Signal Transduction

Signal Transduction Overview

Part 1 of 7 — Signal Transduction Overview

1. Cells communicate through chemical signals
2. Three stages: reception, transduction, response
3. Signal molecules: hormones, neurotransmitters, growth factors
4. Specificity: only target cells with correct receptors respond

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Key Details

• Cells communicate through chemical signals
• Three stages: reception, transduction, response
• Signal molecules: hormones, neurotransmitters, growth factors
• Specificity: only target cells with correct receptors respond

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Types of Signaling

Part 2 of 7 — Types of Signaling

1. Endocrine: long-distance via bloodstream (hormones)
2. Paracrine: local signaling to nearby cells
3. Autocrine: cell signals itself
4. Direct contact: gap junctions, plasmodesmata

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Key Details

• Endocrine: long-distance via bloodstream (hormones)
• Paracrine: local signaling to nearby cells
• Autocrine: cell signals itself
• Direct contact: gap junctions, plasmodesmata

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Signal Reception

Part 3 of 7 — Signal Reception

1. Membrane receptors: G-protein coupled, receptor tyrosine kinases, ion channels
2. Intracellular receptors: for lipid-soluble signals (steroids)
3. Ligand binding causes conformational change
4. Receptor specificity determines which cells respond

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Key Details

• Membrane receptors: G-protein coupled, receptor tyrosine kinases, ion channels
• Intracellular receptors: for lipid-soluble signals (steroids)
• Ligand binding causes conformational change
• Receptor specificity determines which cells respond

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Signal Transduction Pathways

Part 4 of 7 — Signal Transduction Pathways

1. Phosphorylation cascades: kinases add phosphate groups
2. Second messengers: cAMP, Ca²⁺, IP₃
3. Signal amplification: one signal → many responses
4. G-protein linked: α subunit activates adenylyl cyclase → cAMP

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Key Details

• Phosphorylation cascades: kinases add phosphate groups
• Second messengers: cAMP, Ca²⁺, IP₃
• Signal amplification: one signal → many responses
• G-protein linked: α subunit activates adenylyl cyclase → cAMP

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Cellular Responses

Part 5 of 7 — Cellular Responses

1. Gene expression changes: transcription factors activated
2. Enzyme activation/deactivation
3. Cell division stimulation or inhibition
4. Apoptosis: programmed cell death

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Key Details

• Gene expression changes: transcription factors activated
• Enzyme activation/deactivation
• Cell division stimulation or inhibition
• Apoptosis: programmed cell death

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Cell Communication: Problem-Solving Workshop

Part 6 of 7 — Problem-Solving

1. Tracing a signal from reception to response
2. Predicting effects of pathway mutations
3. Analyzing signal amplification
4. Connecting signaling to disease (cancer)

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Key Details

• Tracing a signal from reception to response
• Predicting effects of pathway mutations
• Analyzing signal amplification
• Connecting signaling to disease (cancer)

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Cell Communication: Synthesis & AP Review

Part 7 of 7 — Synthesis & AP Review

1. Signal transduction in homeostasis
2. Signaling errors and disease
3. Evolution of signaling pathways
4. AP free-response: pathway analysis

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Key Details

• Signal transduction in homeostasis
• Signaling errors and disease
• Evolution of signaling pathways
• AP free-response: pathway analysis

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