+Neuroscience 5e Fig. 7.1
Note:
@@ -61,7 +45,6 @@ Note:
Note:
-
---
## Signal amplification
@@ -69,7 +52,8 @@ Note:
* results in a tremendous increase in the potency of the initial signal
* permits precise control of cell behavior
-
+Neuroscience 5e Fig. 7.2
+
Note:
@@ -77,11 +61,16 @@ Note:
## Types of receptors
+
+
+
* Ligand gated ion channels (channel linked receptors/ionotropic receptors)– e.g. nAChR, AMPA receptors
* Enzyme linked receptors– typically have extracellular binding site for signals. Has intracellular domain with catalytic activity regulated by signal. Most are protein kinases that phosphorylate intracellular proteins. e.g. tyrosine kinase
* G-protein coupled receptors– 7-transmembrane spanning receptors that signal through trimeric G-proteins intracellularly. The proteins can alter the function of many downstream proteins. e.g. muscarinic AChR, metabotropic glutamate receptors
* Intracellular receptors– activated by cell permeant or lipophilic signaling molecules like steroid hormones. Signal binds directly to an intracellular protein which then activates transcription
+
+
Note:
@@ -90,9 +79,8 @@ Note:
## Categories of cellular receptors
-Neuroscience 5e 7.4
+Neuroscience 5e Fig. 7.4
-
Note:
@@ -104,7 +92,8 @@ For enzyme linked receptors the signal binds extracellularly, which activates th
## Categories of cellular receptors
-Neuroscience 5e 7.4
+Neuroscience 5e Fig. 7.4
+
Note:
@@ -122,7 +111,7 @@ For intracellular receptors, the signaling molecule passes through lipid membran
* Two types of G-proteins:
* Heterotrimeric G- proteins, composed of an α,β, γ subunits. Multiple members of each class. α subunit binds and hydrolyses GTP
* Small G-proteins– monomeric GTPases (e.g. ras)
-* Active when bound to GTP, inactive when bound to GDP.
+* Active when bound to GTP, inactive when bound to GDP
Note:
@@ -148,12 +137,12 @@ Rate of GTP hydrolysis is important property of G-protein mediated signaling and
## Types of GTP-binding proteins
-
+Neuroscience 5e Fig. 7.5
+
Note:
-
---
## Trimeric G-protein signaling
@@ -164,7 +153,8 @@ Note:
* Dissociates complex and activates
* α and βγ subunits
-
+Molecular Biology of the Cell 4e Fig. 15.28
+
Note:
@@ -190,11 +180,11 @@ Effector enzymes for activated G-proteins include adenylyl cyclase, guanylyl cyc
## Effector pathways associated with G-protein coupled receptors
-
+Neuroscience 5e Fig. 7.6
+
Note:
-
There are many types of alpha, beta, and gamma g-protein subunits allowing a specific and diverse range of downstream responses.
This shows three examples of different heterotrimeric g proteins bound to 3 types of receptors with 3 different cellular responses.
@@ -221,7 +211,8 @@ One target of calcium is calmodulin, a calcium binding protein abundant in the c
## Proteins involved in delivering and removing calcium to the cytoplasm
-
+Neuroscience 5e Fig. 7.7
+
Note:
@@ -244,41 +235,37 @@ Another one intracellular releasing channel is the ryanodine receptor. These are
## Calcium activates calmodulin
-
+Molecular Biology of the Cell 4e Fig. 15.40
Note:
-
---
-## Title Text
+## Calcium second messaging video summary
-[http://courses.pbsci.ucsc.edu/mcdb/bio125/Animation07-02CalciumasaSecondMessenger.mov](http://courses.pbsci.ucsc.edu/mcdb/bio125/Animation07-02CalciumasaSecondMessenger.mov)
-
-
+
Neuroscience 5e Animation 7.2
Note:
-
---
## Second messengers: cyclic nucleotides
* cAMP and cGMP– derivatives of ATP and GTP. Made by adenylyl cyclase and guanylyl cyclase
-* Bind to many targets– cAMP to protein kinase A; cGMP to protein kinase G
+* Bind to many targets– cAMP to protein kinase A, cGMP to protein kinase G
* Phosphodiesterases cleave cAMP and cGMP to inactivate them
Note:
-
---
## cAMP formation and destruction
-
+Molecular Biology of the Cell 4e Fig. 15.31
+
Note:
@@ -300,18 +287,20 @@ Note:
## Diacylglycerol and IP3
-
+Molecular Biology of the Cell 4e Fig. 15.35
+
Note:
-Phosphatidylinositol 4,5-bisphosphate: PIP2,
+Phosphatidylinositol 4,5-bisphosphate: PIP2
---
## Neuronal second messengers
-
+Neuroscience 5e Fig. 7.7
+
Note:
@@ -322,36 +311,16 @@ This table summarizes neuronal second messengers, their sources, targets, and in
## Second messenger life cycles
-cyclic nucleotides
+
cyclic nucleotidesNeuroscience 5e Fig. 7.7
-lipid signals
+
lipid signalsNeuroscience 5e Fig. 7.7
-Neuroscience 5e 7.7
-
-
-
-
Note:
And this depicts the mechanisms involved in production and degradation or removal of cyclic nucleotides and DAG and IP3.
----
-
-## Second messenger life cycles
-
-cyclic nucleotides
-
-lipid signals
-
-gas signals
-
-
-
-Note:
-
-
---
## 2nd messengers target protein kinases and phosphatases
@@ -377,7 +346,8 @@ Protein substrates of kinases and phosphataes include enzymes, neurotransmitter
## Regulation of cellular proteins by phosphorylation
-
+Neuroscience 5e Fig. 7.8
+
Note:
@@ -399,19 +369,10 @@ Note:
## Mechanism of activation of protein kinases
-binding of cAMP to regulatory
+binding of cAMP to regulatory subunits free up the catalytic subunitsNeuroscience 5e Fig. 7.9
+binding of calmodulin opens up protein to activate catalytic domainNeuroscience 5e Fig. 7.9
+DAG causes PKC to change its localization which leads it to be activeNeuroscience 5e Fig. 7.9
-subunits free up the catalytic subunits
-
-binding of calmodulin opens up
-
-protein to activate catalytic domain
-
-DAG causes PKC to change its
-
-localization which leads it to be active
-
-
Note:
@@ -421,12 +382,12 @@ Note:
## Protein kinase A activation
-
+Molecular Biology of the Cell 4e Fig. 15.32
+
Note:
-
---
## Other kinases
@@ -449,7 +410,7 @@ Mitogen activated protein kinases (MAP kinases)
## MAP kinase cascade
-
+Molecular Biology of the Cell 4e Fig. 15-56
Note:
@@ -474,7 +435,7 @@ CREB is an important nuclear signal
## Steps involved in transcription of DNA to RNA
-
+Neuroscience 5e Fig. 7.10
Note:
@@ -485,10 +446,8 @@ uas: upstream activator sequence
>upstream activating sequence or upstream activation sequence (UAS) is a cis-acting regulatory sequence. It is distinct from the promoter and increases the expression of a neighbouring gene.
-upstream from minimal promoter TATA box, binding site for transactivators
-
-a cis acting regulatory sequence (like IRES)
-
---
## CREB
@@ -503,54 +462,27 @@ Note:
## Transcriptional regulation by CREB
-
+Neuroscience 5e Fig. 7.11
+
Note:
---
-## Title Text
+## Chemical signaling mechanisms video summary
-[http://courses.pbsci.ucsc.edu/mcdb/bio125/Animation07-01ChemicalSignalingMechanismsandAmplification.mov](http://courses.pbsci.ucsc.edu/mcdb/bio125/Animation07-01ChemicalSignalingMechanismsandAmplification.mov)
-
-
-
-Note:
-
-
----
-
-## How does NGF promote axon outgrowth
-
--NGF
-
-+NGF
-
-
-
-Note:
-
-
-
---
## Mechanism of action of NGF
-
+Neuroscience 5e Fig. 7.12
+
Note:
@@ -561,12 +493,18 @@ nerve growth factor, binds to tyrosine kinase receptor (TrkA) leading to…
## Signaling at cerebellar parallel fiber synapses
+
+
+
* Glutamate released from presynaptic cell binds ionotropic and metabotropic glutamate receptors
* AMPA receptor opens and excites cell
* mGluR receptor activates a signal transduction pathway that feeds back and decreases AMPA receptor activity
* Called long term depression because now the same stimulus will lead to less depolarization than before (weakened synapse)
-
+
+
+
Neuroscience 5e Fig. 7.13
+
Note:
@@ -586,6 +524,9 @@ likely from phosphorylation of AMPA receptors by PKC and their elimination from
## Regulation of tyrosine hydroxylase by protein phosphorylation
+
+
+
* AP invades axon terminal
* Voltage-gated Ca²⁺ channels open
* Intracellular Ca²⁺ does two things:
@@ -597,7 +538,10 @@ likely from phosphorylation of AMPA receptors by PKC and their elimination from
* Increase in transmitter release
* Increase in post-synaptic response
-