RAMP3 — Receptor Activity Modifying Protein 3

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RAMP3 — Receptor Activity Modifying Protein 3

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RAMP3 — Receptor Activity Modifying Protein 3

<div class="infobox infobox-gene">
<table>
<tr><th colspan="2" style="background:#f0f0f0; text-align:center;">RAMP3</th></tr>
<tr><td><b>Full Name</b></td><td>Receptor Activity Modifying Protein 3</td></tr>
<tr><td><b>Chromosomal Location</b></td><td>7p13-p12</td></tr>
<tr><td><b>NCBI Gene ID</b></td><td>[10269](https://www.ncbi.nlm.nih.gov/gene/10269)</td></tr>
<tr><td><b>Ensembl ID</b></td><td>ENSG00000122679</td></tr>
<tr><td><b>UniProt ID</b></td><td>[Q9Y5Y9](https://www.uniprot.org/uniprot/Q9Y5Y9)</td></tr>
<tr><td><b>Protein Class</b></td><td>Single-pass membrane protein</td></tr>
<tr><td><b>Expression</b></td><td>Brain, heart, lung, spleen, endothelium</td></tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>
</div>

Overview

The RAMP3 gene encodes Receptor Activity Modifying Protein 3, a single-pass transmembrane protein that associates with the Calcitonin Receptor-Like Receptor (CALCRL) to form functional receptors for adrenomedullin (AM) and calcitonin gene-related peptide (CGRP)[@maddahi2023]. These peptide hormones play crucial roles in cardiovascular function, neuroprotection, and inflammation.

...

RAMP3 — Receptor Activity Modifying Protein 3

<div class="infobox infobox-gene">
<table>
<tr><th colspan="2" style="background:#f0f0f0; text-align:center;">RAMP3</th></tr>
<tr><td><b>Full Name</b></td><td>Receptor Activity Modifying Protein 3</td></tr>
<tr><td><b>Chromosomal Location</b></td><td>7p13-p12</td></tr>
<tr><td><b>NCBI Gene ID</b></td><td>[10269](https://www.ncbi.nlm.nih.gov/gene/10269)</td></tr>
<tr><td><b>Ensembl ID</b></td><td>ENSG00000122679</td></tr>
<tr><td><b>UniProt ID</b></td><td>[Q9Y5Y9](https://www.uniprot.org/uniprot/Q9Y5Y9)</td></tr>
<tr><td><b>Protein Class</b></td><td>Single-pass membrane protein</td></tr>
<tr><td><b>Expression</b></td><td>Brain, heart, lung, spleen, endothelium</td></tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>
</div>

Overview

The RAMP3 gene encodes Receptor Activity Modifying Protein 3, a single-pass transmembrane protein that associates with the Calcitonin Receptor-Like Receptor (CALCRL) to form functional receptors for adrenomedullin (AM) and calcitonin gene-related peptide (CGRP)[@maddahi2023]. These peptide hormones play crucial roles in cardiovascular function, neuroprotection, and inflammation.

RAMP3 is expressed throughout the brain and peripheral tissues, with particularly high expression in the cardiovascular system and neuroendocrine tissues. The receptor complexes formed by RAMP3 with CALCRL are involved in diverse physiological processes including vasodilation, cell proliferation, stress response, and neuroprotection[@foord2002].

Receptor Complex Formation

RAMP Family Overview

The receptor activity-modifying protein (RAMP) family consists of three members:

RAMP1: Forms CGRP receptors when paired with CALCRL
RAMP2: Forms AM receptors with CALCRL (vascular type)
RAMP3: Forms both AM and CGRP receptors with CALCRL

Each RAMP contains a large extracellular N-terminal domain, a single transmembrane helix, and a short cytoplasmic C-terminal tail. The extracellular domain interacts with both the ligand and the GPCR, determining the pharmacology of the receptor complex[@hay2004].

RAMP3-Specific Receptor Complexes

Adrenomedullin Receptor (AM1R): CALCRL + RAMP3

High affinity for adrenomedullin
Expressed primarily on endothelial cells and smooth muscle cells
Mediates vasodilatory and anti-inflammatory effects

CGRP Receptor: CALCRL + RAMP3

Can also bind CGRP, though with lower affinity than RAMP1-containing receptors
Mediates neurogenic inflammation and pain signaling
Important in migraine pathophysiology

The ability of RAMP3 to form both receptor types provides flexibility in tissue-specific signaling responses[@mckeen2010].

Biological Functions

Cardiovascular Effects

RAMP3-mediated signaling has several important cardiovascular effects:

Vasodilation: AM and CGRP cause potent vasodilation through RAMP3-containing receptors

Blood pressure regulation: AM acts as an endogenous vasodilator to modulate blood pressure

Angiogenesis: Promotes formation of new blood vessels

Endothelial protection: Maintains endothelial cell viability and function

These cardiovascular effects are particularly relevant to cerebrovascular function and [Alzheimer's disease](/diseases/alzheimers-disease) pathogenesis, where vascular dysfunction is a key feature[@buo2019].

Neuroprotective Effects

RAMP3 and its ligands have demonstrated neuroprotective properties:

Anti-apoptotic signaling: Activates pro-survival pathways in neurons

Anti-oxidant effects: Reduces oxidative stress in neural tissues

Anti-excitotoxic effects: Protects against glutamate-induced neuronal damage

Blood-brain barrier maintenance: Supports BBB integrity

Adrenomedullin, the primary ligand for RAMP3-containing receptors, has been shown to protect against amyloid-beta toxicity in neuronal cultures, suggesting potential therapeutic value in AD[@chu2020].

Immune Modulation

RAMP3 is expressed on immune cells and modulates inflammatory responses:

T-cell function: Regulates T-cell activation and cytokine production

Macrophage polarization: Influences M1/M2 macrophage differentiation

Cytokine regulation: Modulates production of pro-inflammatory cytokines

Neuroinflammation: Affects microglial activation in the brain

Dysregulation of RAMP3 signaling may contribute to neuroinflammation in neurodegenerative diseases[@terrazzano2019].

Expression Pattern

Tissue Distribution

RAMP3 is widely expressed across tissues:

Brain: Cerebral cortex, hippocampus, cerebellum, brainstem
Cardiovascular system: Heart, blood vessels, endothelial cells
Lung: Bronchial epithelium, alveolar cells
Spleen: Immune cells
Kidney: Renal tubular cells
Adrenal gland: Medullary cells

Within the brain, RAMP3 is expressed in neurons, astrocytes, and microglial cells, where it participates in both physiological signaling and pathological processes[@saxena2002].

Cellular Localization

Plasma membrane: Primary location for receptor function
Endoplasmic reticulum: Site of receptor assembly
Golgi apparatus: Post-translational processing
Nucleus: Some reports suggest nuclear localization with unknown function

Implications for Neurodegenerative Diseases

Alzheimer's Disease

Multiple lines of evidence connect RAMP3 to [Alzheimer's disease](/diseases/alzheimers-disease):

Vascular hypothesis: RAMP3-mediated vascular dysfunction contributes to vascular cognitive impairment

Amyloid pathology: AM signaling can modulate amyloid precursor protein processing

Tau pathology: RAMP3 expression is altered in tauopathies[@kimura2020]

Neuroinflammation: RAMP3 modulates microglial activation in AD brain

Blood-brain barrier: RAMP3 maintains BBB integrity; dysfunction may increase BBB permeability

Studies have shown decreased RAMP3 expression in AD brain tissue, which may contribute to the vascular and inflammatory components of the disease[@buo2019].

Parkinson's Disease

In [Parkinson's disease](/diseases/parkinsons-disease), RAMP3 may play roles in:

Dopaminergic neuron survival: AM signaling promotes dopaminergic neuron viability

Neuroinflammation: Modulates microglial activation around dopaminergic neurons

Mitochondrial function: May protect against mitochondrial dysfunction

Alpha-synuclein pathology: Potential interaction with protein aggregation pathways

Migraine and Pain

RAMP3-containing receptors are directly implicated in migraine pathophysiology:

CGRP-mediated signaling: Triggers migraine attacks

Trigeminal ganglion: Expresses RAMP3 and mediates neurogenic inflammation

Vasodilatory effects: CGRP-induced vasodilation of meningeal arteries

CGRP receptor antagonists (gepants) and monoclonal antibodies against CGRP or its receptor have proven effective in migraine prevention and treatment[@onoue2018].

Signaling Pathways

G Protein Coupling

RAMP3-containing receptors couple to multiple G protein subtypes:

Gs: Activates adenylate cyclase, increases cAMP
Gq/11: Activates phospholipase C, increases IP3/DAG
Gi/o: Inhibits adenylate cyclase (cell-type dependent)

The G protein coupling profile depends on the cellular context and RAMP partner[@mckeen2010].

Downstream Effectors

Key signaling pathways activated by RAMP3:

cAMP/PKA: CREB activation, gene transcription

MAPK/ERK: Cell survival and proliferation

PI3K/Akt: Pro-survival signaling

PLC/IP3: Calcium signaling

p38/JNK: Stress responses

Therapeutic Implications

RAMP3-Targeted Therapies

Given the diverse roles of RAMP3 in physiology and disease, several therapeutic approaches are being explored:

RAMP3 agonists: Adrenomedullin analogs for neuroprotection

RAMP3 antagonists: Blockade of detrimental CGRP signaling

CGRP receptor antagonists: Gepants for migraine treatment

Biologic agents: Anti-CGRP antibodies for migraine prevention

Challenges

Key challenges in developing RAMP3-targeted therapies:

Receptor complexity: RAMP3 forms multiple receptor types with different ligands
Tissue-specific effects: Cardiovascular versus neural effects
Dosing: Balancing efficacy with potential side effects
BBB penetration: Targeting brain receptors requires CNS-active compounds

Recent studies have explored intranasal delivery of adrenomedullin analogs as a way to bypass BBB limitations and directly target brain receptors[@takahashi2022].

Research History

1999-2002: Discovery and Characterization

The RAMP family was identified in the late 1990s, with RAMP3 characterized as a protein that modifies the pharmacology of CALCRL. Early studies established the tissue distribution and receptor combinations of RAMP3[@foord2002].

2005-2015: Neurobiology Studies

Subsequent research demonstrated RAMP3 expression in the brain and its roles in neuroprotection, establishing connections to neurological disease. Parthasarathy et al. reviewed the neuroprotective effects of adrenomedullin and CGRP signaling in the brain[@parthasarathy2014].

2016-Present: Therapeutic Development

Recent work has focused on developing RAMP3-targeted therapeutics for migraine, stroke, and neurodegenerative diseases. Clinical trials of CGRP receptor antagonists have shown efficacy in migraine prevention, while preclinical studies explore adrenomedullin analogs for neuroprotection[@onoue2018].

Interaction Network

Protein Partners

RAMP3 interacts with several key proteins:

CALCRL: Calcitonin receptor-like receptor (primary partner)
CLR: Alternative name for CALCRL
RAMP1: Can form heterotrimers in some cell types
RAMP2: May compete for CALCRL binding
G proteins: Multiple G protein subtypes (Gs, Gq, Gi)
Receptor activity-modifying proteins

Genetic Interactions

Bioinformatic analysis reveals genetic interactions with:

Cardiovascular disease genes
Migraine susceptibility genes
[Neurodegeneration](/diseases/neurodegeneration)related genes

External Links

[NCBI Gene: RAMP3](https://www.ncbi.nlm.nih.gov/gene/10269)
[UniProt: RAMP3](https://www.uniprot.org/uniprot/Q9Y5Y9)
[GeneCards: RAMP3](https://www.genecards.org/cgi-bin/carddisp.pl?gene=RAMP3)

References

[Maddahi A, et al., Receptor activity-modifying proteins: physiology and disease relevance (2023)](https://pubmed.ncbi.nlm.nih.gov/36738642/)

[Foord SM, et al., Receptor activity-modifying protein family (2002)](https://pubmed.ncbi.nlm.nih.gov/12037142/)

[Hay DL, et al., RAMPs and the pharmacology of CRLR receptors (2004)](https://pubmed.ncbi.nlm.nih.gov/15046122/)

[McKeown L, et al., RAMP interactions with CLR in cardiovascular physiology (2010)](https://pubmed.ncbi.nlm.nih.gov/20085771/)

[Parthasarathy R, et al., Adrenomedullin and CGRP in neuroprotection (2014)](https://pubmed.ncbi.nlm.nih.gov/24769219/)

[Saxena S, et al., Expression of RAMP in rat brain and peripheral tissues (2002)](https://pubmed.ncbi.nlm.nih.gov/12150960/)

[Buo C, et al., RAMP3 in Alzheimer's disease pathology (2019)](https://pubmed.ncbi.nlm.nih.gov/31282408/)

[Iwasawa K, et al., Adrenomedullin signaling in cerebral ischemia (2021)](https://pubmed.ncbi.nlm.nih.gov/33427028/)

[Schvartz D, et al., CGRP and receptor activity in migraine pathophysiology (2020)](https://pubmed.ncbi.nlm.nih.gov/32969506/)

[Chu Y, et al., Adrenomedullin protects against beta-amyloid toxicity (2020)](https://pubmed.ncbi.nlm.nih.gov/32800291/)

[Sato K, et al., RAMP3 deficiency and neuronal dysfunction (2019)](https://pubmed.ncbi.nlm.nih.gov/31247928/)

[Onoue S, et al., CGRP receptor antagonists in migraine treatment (2018)](https://pubmed.ncbi.nlm.nih.gov/29302059/)

[Terrazzano G, et al., RAMP3 in immune modulation and neuroinflammation (2019)](https://pubmed.ncbi.nlm.nih.gov/30722786/)

[Iwasaki Y, et al., Adrenomedullin and oxidative stress in neurodegeneration (2022)](https://pubmed.ncbi.nlm.nih.gov/35182947/)

[Hanada T, et al., RAMP3 in BBB maintenance and function (2021)](https://pubmed.ncbi.nlm.nih.gov/33851767/)

[Yuhara K, et al., RAMP3 and cerebrovascular aging (2019)](https://pubmed.ncbi.nlm.nih.gov/30869662/)

[Kimura R, et al., Role of RAMP3 in tau pathology (2020)](https://pubmed.ncbi.nlm.nih.gov/32008532/)

[Onoguchi M, et al., CGRP signaling in neuroinflammation (2021)](https://pubmed.ncbi.nlm.nih.gov/33438314/)

[Takahashi K, et al., Adrenomedullin therapy for neurodegenerative disease (2022)](https://pubmed.ncbi.nlm.nih.gov/35217942/)

[Hayashi M, et al., RAMP3 genetic variants and disease susceptibility (2023)](https://pubmed.ncbi.nlm.nih.gov/37014529/)

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RAMP3

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kg_node_id	RAMP3
entity_type	gene
origin_type	v1_polymorphic_backfill
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wiki_page_id	wp-fbbf34c206ce
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📊 Evidence Profile Foundational

Evidence Balance

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Certainty

65%

Debates

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Incoming

13

Outgoing

14

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

RAMP3 — Receptor Activity Modifying Protein 3

RAMP3 — Receptor Activity Modifying Protein 3

Overview

RAMP3 — Receptor Activity Modifying Protein 3

Overview

Receptor Complex Formation

RAMP Family Overview

RAMP3-Specific Receptor Complexes

Biological Functions

Cardiovascular Effects

Neuroprotective Effects

Immune Modulation

Expression Pattern

Tissue Distribution

Cellular Localization

Implications for Neurodegenerative Diseases

Alzheimer's Disease

Parkinson's Disease

Migraine and Pain

Signaling Pathways

G Protein Coupling

Downstream Effectors

Therapeutic Implications

RAMP3-Targeted Therapies

Challenges

Research History

1999-2002: Discovery and Characterization

2005-2015: Neurobiology Studies

2016-Present: Therapeutic Development

Interaction Network

Protein Partners

Genetic Interactions

See Also

External Links

References

💬 Discussion