Related Experiment Video

Updated: Jun 7, 2025

Author Spotlight: Exploring Salidroside's Molecular Mechanisms in Breast Cancer Treatment
11:13

Author Spotlight: Exploring Salidroside's Molecular Mechanisms in Breast Cancer Treatment

Published on: June 9, 2023

1.5K

Unveiling RACK1: a key regulator of the PI3K/AKT pathway in prostate cancer development

Cancan Lyu1, Prasanna Kuma Vaddi1, Said Elshafae1

  • 1Departments of Neuroscience and Pharmacology, University of Iowa, Iowa City, USA.

Oncogene
|November 13, 2024
PubMed

Insights

Receptor for Activated Protein Kinase 1 (RACK1) is crucial for prostate cancer development by activating the PI3K/AKT pathway. Targeting RACK1 may offer a new strategy for prostate cancer treatment.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • The PI3K/AKT pathway is frequently dysregulated in cancers, including prostate cancer.
  • Directly targeting the PI3K/AKT pathway can lead to compensatory activation of other oncogenic pathways.
  • Receptor for Activated Protein Kinase 1 (RACK1) is a scaffolding protein with a potential role in cancer signaling.

Purpose of the Study:

  • To investigate the role of RACK1 in regulating the PI3K/AKT pathway in prostate cancer.
  • To determine if RACK1 is a viable therapeutic target for prostate cancer.

Main Methods:

  • Utilized a genetic mouse model of prostate cancer with PTEN and p53 deficiency.
  • Assessed the impact of RACK1 deficiency on AKT activation, membrane translocation, and mTORC2 interaction.
  • Evaluated downstream effects on tumor cell proliferation and tumor formation.
  • Monitored HER3 and androgen receptor (AR) expression and activation in response to RACK1 inhibition.

Main Results:

  • RACK1 deficiency significantly impaired AKT activation and impeded prostate tumor formation in the PTEN/p53 deficient mouse model.
  • RACK1 was found to facilitate AKT membrane translocation and interaction with mTORC2, promoting AKT activation.
  • Inhibition of AKT activation via RACK1 deficiency did not lead to feedback upregulation of HER3 or AR.
  • RACK1 plays a critical role in orchestrating AKT activation and driving prostate cancer development.

Conclusions:

  • RACK1 is a key regulator of the PI3K/AKT pathway in prostate cancer.
  • Targeting RACK1 presents a promising therapeutic strategy for prostate cancer, potentially avoiding resistance mechanisms associated with direct PI3K/AKT inhibitors.

More Related Videos

Utilizing 18F-FDG PET/CT Imaging and Quantitative Histology to Measure Dynamic Changes in the Glucose Metabolism in Mouse Models of Lung Cancer06:51

Utilizing 18F-FDG PET/CT Imaging and Quantitative Histology to Measure Dynamic Changes in the Glucose Metabolism in Mouse Models of Lung Cancer

Published on: July 21, 2018

17.9K
An Orthotopic Murine Model of Human Prostate Cancer Metastasis06:48

An Orthotopic Murine Model of Human Prostate Cancer Metastasis

Published on: September 18, 2013

35.1K

Related Concept Videos

PI3K/mTOR/AKT Signaling Pathway01:22

PI3K/mTOR/AKT Signaling Pathway

The mammalian target of rapamycin  (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1  (mTORC1) and mTOR complex 2  (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast,  mTORC2 consists of a...
3.4K
mTOR Signaling and Cancer Progression03:03

mTOR Signaling and Cancer Progression

The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
3.7K
The JAK-STAT Signaling Pathway01:20

The JAK-STAT Signaling Pathway

Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as  SH2...
8.7K
Negative Regulator Molecules01:23

Negative Regulator Molecules

Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
35.2K
Interactions Between Signaling Pathways01:19

Interactions Between Signaling Pathways

Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
6.2K
MAPK Signaling Cascades01:07

MAPK Signaling Cascades

Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
5.2K