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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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Endocrine Signaling01:45

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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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Role Of Notch Signalling In Intestinal Stem Cell Renewal01:12

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Notch signaling was first discovered in Drosophila melanogaster, where it is involved in cell lineage differentiation. Notch signaling regulates the maintenance and differentiation of intestinal stem cells or ISCs by controlling the expression of atonal homolog 1 or Atoh1. Atoh1 directs cells to differentiate into secretory cells.
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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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Nucleic acid biosynthesis is a fundamental biochemical process that produces the purine and pyrimidine nucleotides essential for DNA and RNA synthesis. This pathway maintains a balanced nucleotide pool, preventing imbalances that could jeopardize genetic integrity and cellular function. Given the crucial role of nucleotides, their synthesis is tightly regulated to ensure proper cellular homeostasis.Purine BiosynthesisThe biosynthesis of purine nucleotides begins with ribose-5-phosphate, a...
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Related Experiment Video

Updated: Apr 12, 2026

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Purinergic signalling during development and ageing.

Geoffrey Burnstock1, Nicholas Dale

  • 1Autonomic Neuroscience Centre, University College Medical School, Rowland Hill Street, London, NW3 2PF, UK, g.burnstock@ucl.ac.uk.

Purinergic Signalling
|May 21, 2015
PubMed
Summary
This summary is machine-generated.

Extracellular purines and pyrimidines are crucial for vertebrate development and aging. Purinergic signaling influences stem cell differentiation and organogenesis, impacting various tissues throughout life.

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Area of Science:

  • Biochemistry
  • Developmental Biology
  • Neuroscience

Background:

  • Extracellular purines and pyrimidines are vital for vertebrate development, from embryogenesis to aging.
  • Pluripotent stem cells utilize purinergic signaling for differentiation and brain plasticity.

Purpose of the Study:

  • To investigate the role of purinergic signaling in vertebrate development and aging.
  • To explore the manipulation of stem cell fates through purinergic pathways.

Main Methods:

  • Analysis of purinergic signaling components (receptors, ectonucleotidases) in various organ systems.
  • Examination of age-related changes in purinergic receptor expression in the brain and periphery.

Main Results:

  • Purinergic signaling is integral to the development of numerous organ systems, including the cardiovascular, nervous, and muscular systems.
  • Age-related alterations in purinergic receptor expression are observed in the brain (e.g., A1, A2, P2X) and peripheral tissues (e.g., P2X3, P2X4).

Conclusions:

  • Purinergic signaling is a fundamental pathway regulating vertebrate development, organogenesis, and aging processes.
  • Targeting purinergic signaling offers potential for manipulating stem cell behavior and addressing age-related changes.