Galectin-3 is a Sign of Cell Damage

Learn how Galectin-3 signals cell damage and links to health conditions such as heart failure and cancer, along with management insights.

Galectin-3 (Gal-3) is a protein released by damaged or inflamed cells. It helps the body respond to injury, but it also drives inflammation and fibrosis, which is the buildup of scar tissue in organs like the heart, liver, kidneys, and lungs. It also helps the immune system recognize germs and control inflammation.

High Gal-3 levels are linked to heart failure, hardened arteries, stroke, chronic kidney disease, liver scarring, diabetes, autoimmune disorders, and some cancers. In heart failure, higher levels go along with a weaker or stiffer heart, an enlarged upper heart chamber, atrial fibrillation, and worse outcomes.

In cancer, Gal-3 can help tumors grow, spread, and hide from the immune system.

Low Gal-3 levels aren't linked to any specific condition. They usually mean there's little scarring or inflammation going on in the body.

Key Takeaways

• Gal-3 can't diagnose a disease on its own. For heart failure, doctors read it alongside BNP or NT-proBNP, a heart ultrasound, and symptoms.
• Check kidney function first, because weak kidneys can raise Gal-3 even when the heart is fine.
• A high result doesn't mean you have cancer, and Gal-3 shouldn't be used as a cancer screening test.
• The test is most useful over time, to flag people at higher risk and to see whether treatment for heart, kidney, or scarring diseases is working.
• A whole-foods diet low in saturated fat, sugar, and processed red meat may help keep Gal-3 levels down.

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