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TGF - β Signaling Pathway01:16

TGF - β Signaling Pathway

The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...
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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 rapamycin-insensitive companion...
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...
Regulation of the Unfolded Protein Response01:31

Regulation of the Unfolded Protein Response

Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
Notch Signaling Pathway03:14

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The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
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Hedgehog Signaling Pathway02:33

Hedgehog Signaling Pathway

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Molecular Modulation by Lentivirus-Delivered Specific shRNAs in Endoplasmic Reticulum Stressed Neurons
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Heat shock factor 1 signaling: A novel pathway implicated in Rett syndrome pathophysiology.

Sonia Gonzalez1, Amanda M Vanderplow1, Theresa R Wilsterman1

  • 1Department of Molecular Pharmacology and Neuroscience, Loyola University Chicago, Maywood, Illinois.

The Journal of Pharmacology and Experimental Therapeutics
|July 15, 2026
PubMed
Summary

Rett syndrome (RTT) involves MECP2 gene mutations. This study finds that heat shock factor 1 (HSF1) signaling is a key factor in RTT, suggesting HSF1 inhibition as a potential therapeutic strategy for this neurodevelopmental disorder.

Keywords:
Cellular stressHeat shock factor 1MECP2Rett syndrome

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Mutagenesis and Analysis of Genetic Mutations in the GC-rich KISS1 Receptor Sequence Identified in Humans with Reproductive Disorders
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Mutagenesis and Analysis of Genetic Mutations in the GC-rich KISS1 Receptor Sequence Identified in Humans with Reproductive Disorders

Published on: September 4, 2011

Area of Science:

  • Neuroscience
  • Genetics
  • Molecular Biology

Background:

  • Rett syndrome (RTT) is a neurodevelopmental disorder caused by MECP2 gene mutations.
  • Distinguishing pathogenic genes from transcriptional noise is challenging.
  • Atypical RTT patients lack MECP2 mutations but share clinical features.

Purpose of the Study:

  • Identify conserved disrupted pathways in typical and atypical RTT.
  • Reduce transcriptional noise to find critical genes.
  • Investigate heat shock factor 1 (HSF1) signaling in RTT.

Main Methods:

  • Differential RNA sequencing on temporal cortex samples from RTT patients and controls.
  • Validation studies on 37 patient samples.
  • In vivo hyperthermia and cellular stress array analyses in RTT mouse models.

Main Results:

  • HSF1 signaling pathways were enriched in both typical and atypical RTT populations.
  • Increased HSF1 signaling correlated with severe MECP2 mutations.
  • HSF1 induction exacerbated RTT phenotypes in mice, while inhibition improved them.

Conclusions:

  • Promiscuous HSF1 signaling acts as a pathogenic amplifier in RTT.
  • Inhibiting HSF1 signaling may offer therapeutic potential for RTT.
  • HSF1 signaling is a novel therapeutic target for RTT and related disorders.