Cigarette smoke induces mitochondrial metabolic reprogramming in lung cells

Area of Science:

• Proteomics
• Cellular Metabolism
• Environmental Health

Background:

• Cigarette smoking is linked to cellular transformation, primarily through chronic exposure.
• Limited research exists on the specific molecular alterations in lung cells due to prolonged cigarette smoke exposure.

Purpose of the Study:

• To investigate the molecular changes in lung cells following chronic cigarette smoke exposure.
• To understand the temporal proteomic alterations induced by cigarette smoke over 12 months.

Main Methods:

• Tandem mass tag (TMT) based temporal proteomic profiling was employed.
• Lung cells were exposed to cigarette smoke for up to 12 months.

Main Results:

• 2620 proteins were identified, with 671 differentially expressed after 12 months.
• Chronic smoke exposure dysregulated oxidative phosphorylation and upregulated enzymes in the TCA cycle.
• Overexpression of enzymes in glutamine metabolism, fatty acid degradation, and lactate synthesis was observed.

Conclusions:

• Chronic cigarette smoke exposure induces significant mitochondrial metabolic reprogramming in lung cells.
• This reprogramming provides alternative carbon sources for the TCA cycle, supporting cell growth and survival.