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Interactions Between Signaling Pathways01:19

Interactions Between Signaling Pathways

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Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
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Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
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Erythropoietin-producing hepatocellular carcinoma receptor (Eph) and its ligand, Eph receptor-interacting protein (Ephrin) were first discovered in the human carcinoma cell line, hence the name. Ephrin-Eph interaction guides cells to reach their appropriate location in adult tissues. They also play an essential role in the immune system by helping in immune cell migration, adhesion, and activation. Based on their structure and function, Eph is divided into two classes — EphA and EphB.
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Endocrine cells produce hormones to communicate with remote target cells found in other organs. The hormone reaches these distant areas using the circulatory system. This exposes the whole organism to the hormone but only those cells expressing hormone receptors or target cells are affected. Thus, endocrine signaling induces slow responses from its target cells but these effects also last longer.
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Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
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Evaluating the Differentiation Capacity of Mouse Prostate Epithelial Cells Using Organoid Culture
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Cell-Type-Specific Signalling Networks Impacted by Prostate Epithelial-Stromal Intercellular Communication.

Kimberley C Clark1,2, Elizabeth V Nguyen1,2, Birunthi Niranjan1,3

  • 1Cancer Program, Biomedicine Discovery Institute, Monash University, Melbourne, VIC 3800, Australia.

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Summary
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Understanding prostate cancer cell signaling is key. Cancer-associated fibroblasts alter prostate epithelial cell behavior, impacting focal adhesion and metabolism, offering new therapeutic targets.

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fibroblastmass spectrometryprostate cancersignallingtumour microenvironment

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Formation of Human Prostate Epithelium Using Tissue Recombination of Rodent Urogenital Sinus Mesenchyme and Human Stem Cells
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Area of Science:

  • Oncology
  • Cell Biology
  • Proteomics

Background:

  • Prostate cancer is a leading cause of cancer death in men.
  • The tumor microenvironment (TME), including cancer-associated fibroblasts (CAFs), plays a crucial role in prostate cancer progression.
  • Understanding intercellular communication within the TME may reveal novel biomarkers and therapies.

Purpose of the Study:

  • To investigate cell-type-specific proteomic changes in prostate epithelial cells co-cultured with CAFs versus normal prostate fibroblasts (NPFs).
  • To identify key signaling pathways and proteins involved in prostate cancer TME interactions.

Main Methods:

  • Utilized cell-type-specific labeling with amino acid precursors (CTAP) for (phospho)proteomic analysis.
  • Co-cultured BPH-1 benign prostate epithelial cells with patient-derived NPFs and matched CAFs.
  • Performed pathway analysis and functional validation of differentially expressed proteins.

Main Results:

  • Significant differences observed in BPH-1 cell responses to CAF versus NPF co-culture.
  • Upregulation of focal adhesion and cytoskeleton networks, and downregulation of metabolism pathways in BPH-1 cells co-cultured with CAFs.
  • CAFs showed alterations in stress, DNA damage, and cytoskeletal networks.
  • Knockdown of transglutaminase-2 (TGM2) in BPH-1 cells reduced proliferation and migration.

Conclusions:

  • Prostate cancer-associated fibroblasts significantly alter prostate epithelial cell behavior and signaling pathways.
  • Transglutaminase-2 (TGM2) is identified as a key protein in mediating these effects.
  • These findings offer insights into prostate cancer TME communication and potential therapeutic targets.