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Negative Regulator Molecules01:23

Negative Regulator Molecules

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Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
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Aging01:26

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Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
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The Retinoblastoma Gene01:20

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Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
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The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis.
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Related Experiment Video

Updated: Feb 28, 2026

Genome-wide Analysis using ChIP to Identify Isoform-specific Gene Targets
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Genome-wide Analysis using ChIP to Identify Isoform-specific Gene Targets

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RBP4 in Ageing.

María Paz Nieto-Bona1, María García-De Frutos1, Adriana Izquierdo-Lahuerta1

  • 1Departamento de Ciencias Básicas de la Salud, Facultad de Cienciasde la Salud, Universidad Rey Juan Carlos, Avda. de Atenas s/n, 28922 Alcorcón, Madrid, Spain.

Biomedicines
|February 27, 2026
PubMed
Summary

Elevated retinol-binding protein 4 (RBP4) levels increase with age, contributing to age-related diseases. Understanding RBP4

Area of Science:

  • Biochemistry
  • Gerontology
  • Metabolic Research

Background:

  • Retinol-binding protein 4 (RBP4) is a lipocalin protein primarily secreted by adipose tissue and liver.
  • RBP4 transports vitamin A (retinol) in circulation and is linked to metabolic disorders like insulin resistance and MASLD.
  • RBP4 is also produced by other tissues, including the kidney.

Purpose of the Study:

  • To investigate the role of RBP4 in the aging process.
  • To analyze the mechanisms and organ-specific effects of RBP4 during aging.

Main Methods:

  • Analysis of circulating RBP4 levels in aging populations.
  • Correlation studies linking RBP4 levels to age-related conditions.
  • Investigation of molecular mechanisms mediating RBP4 effects in aging.
Keywords:
RBP4ageingmechanismsorgans

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Main Results:

  • Circulating RBP4 levels significantly increase with age.
  • Increased RBP4 is associated with sarcopenia, neurodegeneration markers, elevated TSH, atherogenesis, chronic kidney disease, and osteoarthritis.
  • RBP4-mediated aging effects involve chronic inflammation, insulin resistance, oxidative stress, mitochondrial dysfunction, autophagy inhibition, and intestinal dysbiosis.

Conclusions:

  • RBP4 is a critical factor in the aging process.
  • Elevated serum RBP4 levels in older individuals accelerate deterioration across multiple organ systems.
  • Targeting RBP4 may offer therapeutic strategies for age-related decline.