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Regulated Protein Degradation02:58

Regulated Protein Degradation

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It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
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Laminins are heterotrimeric proteins with high molecular mass found in the extracellular matrix. Each laminin molecule is composed of three chains, viz. alpha, beta, and gamma, coded by five, four, and three paralogous genes, respectively. Laminins are categories based on the compositions of the three chains.
In humans, the five forms of alpha chains are LAMA 1, LAMA 2, LAMA 3, LAMA 4, and LAMA 5. The four forms of beta chains are LAMB 1, LAMB 2, LAMB 3, and LAMB 4. The three forms of gamma...
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The basal lamina is a thin extracellular layer that lies underneath the cells and separates them from other tissues. The three layers of the basal lamina are lamina lucida, lamina densa and lamina reticularis. The basal lamina, a mixture of glycoproteins and collagen, provides an attachment site for the epithelium, separating it from underlying connective tissue. The framework of basal lamina has other essential proteins such as laminins mesh, perlecan, entactin, and type IV collagen.
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Type IV Collagen of Basal Lamina01:05

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Type IV collagen is a 400 nm long, network-forming collagen that acts as a barrier between the epithelial and endothelial cells. Type IV collagen  forms the backbone of the basement membrane by scaffolding with laminin, entactin, proteoglycans, and fibronectin. Apart from rendering structural support to the basement membrane, it also helps entail signaling potentials necessary for both pathological and physiological functions.
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Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
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ATDC mediates a TP63-regulated basal cancer invasive program.

Phillip L Palmbos1,2, Yin Wang3,4, Armand Bankhead Iii4,5,6

  • 1Department of Internal Medicine, University of Michigan Medical Center, Ann Arbor, MI, 48109, USA. ppalmbos@med.umich.edu.

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Summary

The study reveals that the TP63 gene drives aggressive basal bladder cancers by activating the ATDC gene. ATDC is crucial for tumor invasion and metastasis, offering potential new therapeutic targets.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Genetics

Background:

  • Basal subtype bladder cancers are aggressive, with poorly understood molecular drivers of lethality.
  • Ataxia-telangiectasia group D complementing gene (ATDC) promotes bladder tumor formation and invasion, but its regulation is unknown.
  • The aggressive basal subtype of bladder cancer is characterized by a TP63-driven gene program.

Purpose of the Study:

  • To investigate the relationship between TP63 and ATDC expression in basal bladder cancers.
  • To elucidate the role of TP63 in regulating ATDC and its contribution to aggressive tumor behavior.

Main Methods:

  • Analysis of ATDC expression in relation to TP63 and basal bladder cancer subtypes.
  • Chromatin immunoprecipitation assays to assess TP63 binding to ATDC and KRT14 regulatory regions.
  • In vivo studies to evaluate the requirement of ATDC in TP63-induced tumor invasion and metastasis.

Main Results:

  • ATDC expression is significantly linked with TP63 expression and is high in basal bladder cancers.
  • TP63 directly binds to the regulatory regions of ATDC and KRT14, enhancing their expression.
  • ATDC and KRT14 are essential components of the TP63-driven invasive program, with ATDC required for TP63-induced invasion and metastasis in vivo.

Conclusions:

  • TP63 activation drives an aggressive basal cancer program involving ATDC and KRT14.
  • ATDC is a key molecular determinant of aggressive basal bladder cancer behavior.
  • Targeting ATDC may offer novel therapeutic strategies and improved biomarkers for aggressive bladder cancers.