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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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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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The Hedgehog gene (Hh) was first discovered due to its control of the growth of disorganized, hair-like bristles phenotype in Drosophila, much like hedgehog spines. Hh plays a crucial role in the development of organs and the maintenance of homeostasis in both invertebrates and vertebrates. However, while Drosophila has only one Hh protein, mammals have multiple functional Hedgehog proteins - Sonic (Shh), Desert (Dhh), and Indian Hedgehog (Ihh). All of these homologous proteins have adapted to...
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Stimulation of Notch Signaling in Mouse Osteoclast Precursors
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Notch1 haploinsufficiency in mice accelerates adipogenesis.

Kazutoshi Yamaguchi1, Motoharu Hayashi1, Yasuhiro Uchida1

  • 1Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan.

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Haploinsufficiency of Notch1 promotes fat accumulation and adipogenesis by altering key molecular pathways. This study links Notch signaling to metabolic syndrome development.

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Area of Science:

  • Metabolic Regulation
  • Cellular Biology
  • Endocrinology

Background:

  • Notch signaling is a crucial regulator of cellular processes and metabolism.
  • Its specific role in adipogenesis and metabolic syndrome remains incompletely understood.

Purpose of the Study:

  • To investigate the role of Notch1 in adipogenesis and its impact on metabolic syndrome development.
  • To elucidate the molecular mechanisms linking Notch1 haploinsufficiency to fat accumulation.

Main Methods:

  • Utilized wild-type and Notch1 hetero-mutant mice fed normal or high-fat diets for 12 weeks.
  • Analyzed white adipose tissue for adipogenic markers, proliferation markers, and gene expression.
  • Assessed glucose and insulin tolerance.
  • Investigated effects of Notch inhibition and knockdown on 3T3-L1 preadipocytes.

Main Results:

  • Notch1 haploinsufficiency led to increased adipose tissue accumulation, adipogenic cell markers (CD34+CD68+), and proliferation (cyclin D1, Ki67).
  • Downregulation of Notch targets (Hes-1, Pref-1, Sox9) and upregulation of adipogenic factors (PPARγ, C/EBPα) were observed.
  • Impaired glucose and insulin tolerance, with reduced IRS-1 and GLUT4 in white adipose tissue, were noted in N1+/- mice on a high-fat diet.
  • Pharmacological inhibition or knockdown of Notch1 enhanced adipogenesis in 3T3-L1 cells.

Conclusions:

  • Haploinsufficiency of Notch1 promotes fat accumulation and adipogenesis.
  • Notch1 plays a protective role against metabolic syndrome development.
  • This study establishes a mechanistic link between Notch signaling and metabolic syndrome.