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A Robust Discovery Platform for the Identification of Novel Mediators of Melanoma Metastasis
Published on: March 8, 2022
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RACK1 cooperates with NRASQ61K to promote melanoma in vivo
C Campagne1, E Reyes-Gomez2, M E Picco3
1INRA, UMR955 Génétique Fonctionnelle et Médicale, Ecole Nationale Vétérinaire d'Alfort, F-94704 Maisons-Alfort, France; Université Paris-Est, Ecole Nationale Vétérinaire d'Alfort, UMR955 Génétique Fonctionnelle et Médicale, F-94704 Maisons-Alfort, France.
Cellular Signalling
|March 28, 2017
Summary
Receptor for activated protein kinase C (RACK1) protein promotes aggressive melanoma development. RACK1 overexpression accelerates tumor progression by coordinating ERK, JNK, and STAT3 signaling pathways in predisposed mice.
Area of Science:
- Oncology
- Molecular Biology
- Dermatology
Background:
- Melanoma is an aggressive skin cancer with high mortality.
- Receptor for activated protein kinase C (RACK1) is a scaffold protein involved in cell signaling.
- RACK1 has been proposed as a biomarker for melanoma and may influence signaling pathways like ERK and JNK.
Purpose of the Study:
- To investigate the in vivo role of RACK1 in melanoma development using a genetic approach.
- To determine if RACK1 rewires ERK and JNK signaling pathways in melanoma.
- To develop and utilize a mouse model for RACK1 gain of function in melanocytes.
Main Methods:
- Genetic manipulation of Rack1 expression in mouse melanoma cell lines (B16).
- Development of Tyr::Rack1-HA transgenic mice for conditional RACK1 overexpression in melanocytes.
- Analysis of melanoma initiation, progression, incidence, and metastasis in genetically modified mice.
- Assessment of signaling pathway activation (ERK, AKT, JNK, STAT3) in primary melanoma cells.
Main Results:
- Rack1 knockdown in B16 melanoma cells reduced invasiveness and promoted differentiation.
- RACK1 overexpression alone did not initiate melanoma but accelerated tumor development in a predisposed context.
- RACK1 overexpression reduced melanoma latency, increased incidence, and enhanced metastatic rate.
- Activated JNK and STAT3 were identified as RACK1 oncogenic partners in tumoral progression.
- A sequential activation of ERK, JNK, and STAT3 coordinated by RACK1 accelerates aggressive melanoma.
Conclusions:
- RACK1 plays a critical role in promoting aggressive melanoma development in vivo.
- RACK1 functions by coordinating key signaling pathways including ERK, JNK, and STAT3.
- Targeting RACK1 or its associated pathways may offer therapeutic strategies for melanoma.
