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Cell Specific Gene Expression01:58

Cell Specific Gene Expression

Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
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Neurogenic-committed human pre-adipocytes express CYP1A isoforms.

Chiara Scanarotti1, Anna Maria Bassi, Mariafrancesca Catalano

  • 1Cell Culture Lab, DIMES, University of Genoa, Via L.B. Alberti 2, 16132 Genoa, Italy. chiara_scanarotti@yahoo.it <chiara_scanarotti@yahoo.it>

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Summary

Human stem cells from lipoaspirate can model neurogenic development and assess environmental pollutant effects. These pre-adipocyte models show potential for evaluating contaminant impacts on cells and neurogenesis.

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Area of Science:

  • Biotechnology
  • Toxicology
  • Stem Cell Research

Background:

  • Human lipoaspirate yields adult stem cells (pre-adipocytes) capable of differentiating into various cell types, including neurogenic lineages.
  • In vitro stem cell models are valuable for therapeutic applications and assessing alternative testing methods.
  • Environmental pollutants can impact adipose cells and neurogenic development, necessitating robust screening models.

Purpose of the Study:

  • To analyze the suitability of human pre-adipocyte and their neurogenic derivatives as in vitro models for screening exogenous compounds, specifically environmental pollutants.
  • To investigate the neurogenic differentiation potential of these stem cell models.
  • To evaluate the activity of cytochrome P450 1A1 (CYP1A1)-related enzymes in response to polycyclic aromatic hydrocarbon (PAH)-type inducers.

Main Methods:

  • Human lipoaspirate-derived stem cells (pre-adipocytes) were cultured and induced towards neurogenic differentiation.
  • Neurogenic differentiation was assessed by analyzing cholinergic system expression and acetylcholinesterase immunoreactivity.
  • Cytochrome P450 1A1 (CYP1A1) enzyme activity (ECOD and EROD assays) and protein expression were measured in basal conditions and after exposure to beta-naphthoflavone (BNF).

Main Results:

  • Both pre-adipocyte and neurogenic cell models exhibited basal and inducible levels of 7-ethoxycoumarin-O-deethylase (ECOD) activity.
  • Exposure to beta-naphthoflavone (BNF), a polycyclic aromatic hydrocarbon (PAH)-type inducer, led to increased CYP1A1 protein expression and 7-ethoxyresorufin-O-deethylase (EROD) activity.
  • These findings confirm the inducibility of the CYP1A1 isoform in the stem cell models.

Conclusions:

  • Mesenchymal adult stem cells, specifically pre-adipocytes and their neurogenic derivatives, represent innovative and suitable in vitro models.
  • These models can be effectively utilized for evaluating the cytotoxic and biological effects of unintended exposure to environmental contaminants.
  • The study supports the use of these stem cell systems for toxicological screening of environmental pollutants impacting adipose and neural development.