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Replicative Cell Senescence

Replicative Cell Senescence

Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds the telomeric...

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Cellular Senescence Program is Sensitive to Physical Differences in Polymeric Tissue Scaffolds.

Parul Yadav¹, Rahul Shah², Anindo Roy²

¹Department of Bioengineering, Indian Institute of Science, C.V Raman Avenue, Bangalore, India 560012.

ACS Materials Au

|January 15, 2024

Summary

This summary is machine-generated.

Substrate design influences cellular senescence. Three-dimensional scaffolds, unlike 2D cultures, significantly alter cell size and senescence induction due to changes in cell spreading and interactions.

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Area of Science:

Biomaterials Science
Cell Biology
Tissue Engineering

Background:

Cellular senescence is a complex program triggered by DNA damage, leading to altered cell morphology, oxidative stress, and inflammation.
Traditional cell culture in 2D formats may not fully recapitulate the in vivo microenvironment, potentially influencing cellular responses like senescence.

Purpose of the Study:

To investigate whether the onset of cellular senescence is influenced by the physical characteristics of the substrate, specifically design, porosity, and architecture.
To compare cellular senescence responses in three-dimensional (3D) scaffolds versus traditional two-dimensional (2D) culture systems.

Main Methods:

A library of polymeric scaffolds with varying stiffness, architecture, and porosity was fabricated for tissue engineering applications.
Irradiated A549 lung cancer cells were cultured on these 3D scaffolds and compared to cells in 2D culture.
Cellular responses, including cell size and senescence induction, were analyzed.

Main Results:

Senescence onset was diminished in 3D scaffolds compared to 2D culture formats.
Significant differences in cell size and senescence induction were observed between 3D scaffolds and 2D cultures.
Altered cell spreading and cellular interactions on 3D substrates were identified as key factors contributing to the observed differences in senescence.

Conclusions:

Scaffold architecture plays a crucial role in modulating the cellular senescence program.
3D scaffold environments significantly impact cellular senescence compared to 2D cultures, highlighting the importance of biomaterial design in cellular behavior.