Tracking biochemical changes induced by iron loading in AML12 cells with synchrotron live cell, time-lapse infrared...

Area of Science:

• * Hepatology and metabolic biochemistry.
• * Cellular metabolism and disease mechanisms.

Background:

• * Hepatocytes regulate iron and lipid homeostasis; dysregulation is linked to non-alcoholic fatty liver disease (NAFLD).
• * Mild hepatic iron increases are common in NAFLD, but the mechanism remains unclear.
• * NAFLD is the liver manifestation of metabolic syndrome, characterized by lipid metabolism disruption.

Purpose of the Study:

• * To investigate the metabolic effects of iron loading on hepatocytes.
• * To elucidate the role of iron in the development of hepatic steatosis.

Main Methods:

• * Live cell, time-lapse Fourier transform infrared (FTIR) microscopy using synchrotron radiation.
• * Non-destructive, label-free tracking of sub-cellular biochemical changes over 8 hours.
• * Utilized AML12 cells to model hepatocyte response to iron loading.

Main Results:

• * Iron loading in hepatocytes perturbed lipid metabolism, inducing a steatosis-like phenotype.
• * Iron-loaded cells showed a threefold increase in triglyceride accumulation (elevated ester carbonyls).
• * Increased fatty acid acyl chain length was observed in iron-loaded cells, unlike controls.

Conclusions:

• * Mild to moderate iron loading directly promotes de novo lipid synthesis in hepatocytes.
• * Iron accumulation plays a role in initiating hepatic lipid accumulation and steatosis development.
• * Synchrotron FTIR microscopy provides a powerful tool for observing dynamic metabolic changes in live cells.