Regulation of Ion Channels by Drugs and Hormones Roles of local signaling complexes Lessons from Investigation of Human Disease Pharmacology Unique to.

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Presentation transcript:

Regulation of Ion Channels by Drugs and Hormones Roles of local signaling complexes Lessons from Investigation of Human Disease Pharmacology Unique to Voltage-Gated Ion channels

Adrenergic Regulation of Cardiac Electrical Activity : Lessons from Human Disease Keating & Sanguinetti, Cell, 2001.

LQTS: Genetic Linkage to Multiple Ion Channel Genes

AP Prolongation Can Trigger Arrhythmias

Triggers Are Gene-specific Circ 2001;103:89-95

 -Adrenergic Stimulation Shortens AP Duration (Kass & Wiegers, J Physiol. 1982)

 -AR Regulation of Cardiac AP: A Balance of Inward and Outward Current L-type Calcium Channel current Increased Slow I Ks potassium channel Current Increased

KCNE1KCNQ1 (KvLQT-1) KCNQ1+KCNE1 200 pA/pF KCNQ1 0.5 s 50 pA/pF (Splawski et al, Circ102; , 2000) (minK) Molecular Architecture of I KS Channel Revealed Through LQTS studies

Receptor stimulation to Local Signaling

Agonist Binding and Receptor Activation

cAMP Pathway: Receptor Activation Increases cAMPi

cAMP Bindng: Dissociation of Regulatory and Catalytic PKA subunits

Adaptor Proteins: Molecular Basis for Receptor/Substrate Diversity: Channel as Macromolecular Complexes

Calcium Channel Complex

Channels as Macromolecular Signaling Complexes Signaling Microdomains exapnd diversity of receptor-mediated cellular responses Disruption of Microdomains in disease can unbalance physiological responses

K Channel Complex

Functional regulation in TG + Myocytes but not in CHO cells: Phosphatase and Kinase activity

Human Heart KCNQ1 forms a macromolecular complex

RyR macromolecular complexes are held together by leucine/isoleucine zippers (LZs) Marx, et al., (2001). The Journal of Cell Biology, 153:

A leucine zipper motif in KCNQ1 C-terminus : Coordination of protein-protein interactions (LZm = V595A/L602A)

The K channel Complex can be Disrupted in Disease

AP Prolongation Can Trigger Arrhythmias

State-dependent Block of Ion Channels by drugs The Modulated Receptor Hypothesis Hille, B. (1977). Local anesthetics: hydrophilic and hydrophobic pathways for the drug-receptor reaction. Journal of General Physiology 69,

Sodium and Calcium Channels are Targets of Voltage-Regulated Drugs

Drug Ionization Restricts Access to Drug Receptor

Na + X Closed Open Inactivated Na+ channel open state inactivation

Use-Dependent Block Pulse-dependent channel availability depends on recovery from inactivation; Drug-Bound Channels recovery slower than drug-free channels; Channels are not available for excitation when drug-bound.

Drug binding is influenced by the state of the channel: Preferential binding to and Stabilization of the Inactivated State

Block Develops During Repetitive electrical Activity Block During Depolarization (systole) Unblock During Repolarization (Diastole)

Mapping a drug receptor via Alanine Scanning

Targeting Different Channels for Distinct Therapeutic Goals:

50ms  KPQ Chandra, R., et. al., (1998) Am. J. Physiol. 274, H1643-H1654. Wild-Type (WT)Y179C (YC) Novel Pharmacology of Inherited Sodium Channel Mutations

The Local Anesthetic Receptor for Voltage-Gated Sodium Channels