ADCY8 Protein

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Adenylate Cyclase 8

Introduction

Adcy8 Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

<div class="infobox infobox-protein">
<table>
<tr><th colspan="2" style="background:#4a90d9;color:white;text-align:center">ADCY8</th></tr>
<tr><th>Gene</th><td>[ADCY8](/genes/adcy8)</td></tr>
<tr><th>UniProt ID</th><td>[P40145](https://www.uniprot.org/uniprotkb/P40145)</td></tr>
<tr><th>PDB ID</th><td>5E0M, 6R3Q</td></tr>
<tr><th>Molecular Weight</th><td>124 kDa</td></tr>
<tr><th>Subcellular Localization</th><td>Plasma membrane, dendritic membranes, postsynaptic densities</td></tr>
<tr><th>Protein Family</th><td>Adenylyl cyclase family (Class III AC)</td></tr>
<tr><th>Associated Diseases</th><td>[Alzheimer's Disease](/diseases/alzheimers-disease), Autism, Bipolar Disorder, Epilepsy</td></tr>
</table>
</div>

Overview

...

Adenylate Cyclase 8

Introduction

Adcy8 Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

Overview

Mermaid diagram (expand to render)

ADCY8 (Adenylate Cyclase 8), also known as AC8, is a calcium/calmodulin-responsive adenylyl cyclase that is highly enriched in the brain, particularly in the [hippocampus](/brain-regions/hippocampus), [cortex](/brain-regions/cortex), and cerebellum. It catalyzes the conversion of ATP to cyclic AMP (cAMP), serving as a critical signal transduction enzyme that integrates calcium and G protein signaling pathways to regulate neuronal function, synaptic plasticity, learning, and memory.

Structure

ADCY8 possesses the characteristic transmembrane organization of membrane-bound adenylyl cyclases, consisting of:

N-terminal extracellular domain: Involved in dimerization and membrane targeting
12 transmembrane helices: Organized into two sets of six (TM1-TM6 and TM7-TM12)
Cytoplasmic catalytic domains (C1a and C2a): Form the catalytic core that binds ATP and produces cAMP
Calmodulin-binding domain: Located in the C1a region, mediates calcium/calmodulin activation

The crystal structures of the catalytic domains (PDB: 5E0M, 6R3Q) have revealed the molecular basis for forskolin binding and allosteric regulation.

Normal Function

ADCY8 plays essential roles in neuronal physiology:

Second Messenger Signaling

Synthesizes cAMP in response to calcium influx through voltage-gated calcium channels
Responds to Gs protein-coupled receptor activation (e.g., dopamine D1, β-adrenergic receptors)
Generates cAMP gradients that regulate local signaling microdomains

Synaptic Plasticity

Facilitates [LTP](/mechanisms/long-term-potentiation) (Long-Term Potentiation) in hippocampal [neurons](/entities/neurons)
Required for memory consolidation and retrieval
Regulates AMPA receptor trafficking and synaptic strength

Gene Expression Regulation

Activates PKA, which phosphorylates CREB transcription factor
Controls expression of plasticity-related genes
Modulates epigenetic regulators involved in learning

Neuronal Development

Regulates neurite outgrowth and axonal guidance
Controls dendritic spine formation and morphology
Influences synapse maturation during development

Role in Disease

Alzheimer's Disease

Altered ADCY8 expression and activity contribute to synaptic dysfunction
[Aβ](/proteins/amyloid-beta) oligomers impair calcium/calmodulin-activated cAMP production
Reduced cAMP signaling compromises [LTP](/mechanisms/long-term-potentiation) and memory consolidation
Therapeutic strategies aim to restore ADCY8-mediated signaling

Autism Spectrum Disorder

ADC8 mutations have been linked to ASD phenotypes
Dysregulated cAMP signaling affects neural circuit formation
Alters social behavior and cognitive flexibility

Bipolar Disorder

Genetic variants in ADCY8 associated with bipolar disorder
Lithium may indirectly modulate ADCY8 signaling pathways
Affects mood stabilization through cAMP regulation

Epilepsy

Aberrant cAMP signaling contributes to epileptogenesis
ADCY8 dysfunction alters neuronal excitability
Potential target for anti-epileptic drug development

Therapeutic Targeting

Modulating ADCY8 activity is being explored as a therapeutic strategy:

Activators

Forskolin: Direct AC activator, research tool, limited clinical use
Calcium/calmodulin-enhancing compounds
PDE inhibitors to increase cAMP levels indirectly

Inhibitors

Specific ADCY8 inhibitors under development
Calcium channel blockers to reduce Ca²⁺-mediated activation
Targeting upstream GPCRs that activate ADCY8

Clinical Approaches

Gene therapy to restore ADCY8 expression
Small molecule modulators of AC catalytic activity
Combination approaches targeting multiple signaling pathways

Key Publications

PMID: 8408968(https://pubmed.ncbi.nlm.nih.gov/8408968/) - Calcium/calmodulin-activated adenylyl cyclases in neuronal function

PMID: 8855382(https://pubmed.ncbi.nlm.nih.gov/8855382/) - Adenylyl cyclase isoforms in neural development

PMID: 10775617(https://pubmed.ncbi.nlm.nih.gov/10775617/) - Adenylyl cyclases in synaptic plasticity and memory

PMID: 14697656(https://pubmed.ncbi.nlm.nih.gov/14697656/) - PLC and AC signaling crosstalk in the brain

PMID: 15805331(https://pubmed.ncbi.nlm.nih.gov/15805331/) - ADCY8 in synaptic plasticity and learning

PMID: 21113154(https://pubmed.ncbi.nlm.nih.gov/21113154/) - Calcium-stimulated adenylyl cyclases in neurodegeneration

PMID: 23480855(https://pubmed.ncbi.nlm.nih.gov/23480855/) - ADCY8 dysfunction in Alzheimer's disease models

PMID: 28986567(https://pubmed.ncbi.nlm.nih.gov/28986567/) - cAMP signaling in synaptic plasticity and memory disorders

Background

The study of Adcy8 Protein has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.

Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.

References

Ferguson GD, et al (2005). Altered synaptic plasticity and memory formation in ADCY8-deficient mice. Learn Mem. 12(2):173-183. PMID: 15805331(https://pubmed.ncbi.nlm.nih.gov/15805331/).

Xia Z, Storm DR (2005). The role of calmodulin-stimulated adenylyl cyclases as coincidence detectors in memory formation. J Mol Neurosci. 26(2-3):277-282. PMID: 16000655(https://pubmed.ncbi.nlm.nih.gov/16000655/).

Wang H, Zhang M (2012). The role of Ca²⁺/calmodulin-stimulated adenylyl cyclases as bidirectional glucose sensors in the pancreas. Islets. 4(4):273-275. PMID: 22924361(https://pubmed.ncbi.nlm.nih.gov/22924361/).

Conti AC, et al (2009). Soluble adenylyl cyclase is essential for proper cytoskeletal organization and synaptic plasticity. Neuron. 63(4):511-524. PMID: 19647936(https://pubmed.ncbi.nlm.nih.gov/19647936/).

Pathway Diagram

The following diagram shows the key molecular relationships involving ADCY8 Protein discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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ADCY8 Protein

Adenylate Cyclase 8

Introduction

Overview

Adenylate Cyclase 8

Introduction

Overview

Structure

Normal Function

Second Messenger Signaling

Synaptic Plasticity

Gene Expression Regulation

Neuronal Development

Role in Disease

Alzheimer's Disease

Autism Spectrum Disorder

Bipolar Disorder

Epilepsy

Therapeutic Targeting

Activators

Inhibitors

Clinical Approaches

Key Publications

Background

References

See Also

Pathway Diagram