ERRβ splice variants differentially regulate cell cycle progression

Area of Science:

• Molecular Biology
• Cell Biology
• Endocrinology

Background:

• Nuclear receptors are crucial regulators of gene expression.
• Estrogen-related receptors (ERRs) are orphan nuclear receptors with unique functions.
• ERRβ has splice variants with potentially distinct biological roles.

Purpose of the Study:

• To investigate the differential roles of ERRβ splice variants, ERRβsf and ERRβ2, in cell cycle regulation.
• To elucidate the mechanisms by which these variants influence cell cycle checkpoints and senescence.
• To explore the interaction between ERRβ splice variants.

Main Methods:

• Utilized DY131, a synthetic ERRβ agonist.
• Employed splice-variant selective shRNA for gene knockdown.
• Used exogenous ERRβsf and ERRβ2 cDNAs for overexpression studies.
• Analyzed cell cycle progression and senescence markers.

Main Results:

• ERRβsf mediates a G1 checkpoint through p21 and is essential for DY131-induced senescence.
• ERRβ2 mediates a G2/M arrest in response to DY131.
• Absence of ERRβ2 leads to reversal of G2/M arrest, p21 induction, and a G1 arrest.

Conclusions:

• Estrogen-related receptor beta (ERRβ) splice variants exhibit distinct functions in cell cycle control.
• ERRβsf promotes G1 arrest and senescence, while ERRβ2 induces G2/M arrest.
• Evidence suggests interplay between ERRβ splice variants in regulating cellular responses.