Aging Exacerbates Binge Ethanol-Mediated Bone Toxicity in Mice

Area of Science:

• Bone biology
• Gerontology
• Pharmacology

Background:

• Alcohol consumption and aging are risk factors for osteopenia and osteoporosis.
• The interaction between alcohol and aging on bone health is not well understood.
• This study uses a mouse model to explore how aging influences skeletal responses to binge ethanol exposure.

Purpose of the Study:

• To investigate the combined effects of binge ethanol exposure and aging on bone remodeling.
• To determine how aging affects the skeletal response to binge ethanol in mice.
• To analyze changes in bone formation and resorption markers and gene expression.

Main Methods:

• Used Dmp1-Cre TdTomato mice and controls of 12 and 78 weeks of age.
• Administered binge ethanol or PBS via gavage for four consecutive days.
• Assessed skeletal responses through serum bone turnover markers (ELISA) and gene/protein expression in bone tissue (qRT-PCR, Western blots).

Main Results:

• Both ethanol and aging decreased bone formation markers (P1NP, osteocalcin).
• Ethanol exposure increased bone resorption marker (CTX-1) in aging mice.
• Ethanol and aging upregulated osteoclastogenesis genes (Calcr, RANKL) and downregulated osteoblastogenesis genes (Col1a1, Col1a2, Smpd3), with aging exacerbating these effects.

Conclusions:

• Binge ethanol and aging independently and synergistically disrupt bone remodeling.
• Bone formation is inhibited, and bone resorption is enhanced by the combined effects of binge ethanol and aging.
• Aging potentiates the negative skeletal effects of binge ethanol exposure.