Ferritin – more than just iron storage
Ferritin It is the main iron storage protein in the body. It binds iron atoms, stores them safely, and releases them when needed. Thanks to this mechanism, the body constantly has iron available for such vital processes as oxygen transport, energy production, and the functional activity of cellular enzymes. At the same time, ferritin prevents the accumulation of free iron, which can be harmful to tissues.
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Determining the level of ferritin in the blood allows for the assessment of the body's iron stores, therefore it is one of the most informative laboratory tests for detecting iron deficiency.
How Keeps და allocates Ferritin Iron?
The ferritin molecule is primarily an intracellular structure — it is located in the cytoplasm of cells and stores iron there in a safe form.
The largest amounts of ferritin are found in the cells of those organs and tissues that are actively involved in iron storage and metabolism:
- Liver cells (hepatocytes) — One of the main stores of iron in the body
- Bone marrow cells — Erythrocytes are produced here and a constant supply of iron is needed to produce hemoglobin
- Spleen macrophages — where old erythrocytes are broken down and the iron released from them is recycled
Small amounts of ferritin are also secreted into the blood. It is the ferritin in the blood serum that is measured in a laboratory test and is used to assess the body's iron stores.
Some of the iron from food is stored in ferritin, where it is stored in a stable, non-toxic form. When the body needs additional iron—for example, to make new erythrocytes (red blood cells)—ferritin releases the required amount of iron from the stores and returns it to the bloodstream.
Free iron is dangerous to human health — and that's why it matters. Free iron, moving uncontrollably through tissues, produces harmful molecules called free radicals. They damage cell membranes and DNA. Ferritin's main function is to safely "lock up" iron and store it until the body actually needs it. Thus, ferritin protects cells from oxidative damage while ensuring that iron is available when needed.
Ferritin Role Infection და Inflammation At the time
Ferritin's function in the body is not limited to managing iron stores. It also participates in immune defense processes. When the body detects an infection, it increases the production of ferritin, which binds and safely "stores" iron in the blood.
Bacteria and other organic pathogens require the host's iron stores for DNA synthesis and replication, energy production, redox and other respiratory processes. During infectious processes, excessive production of ferritin has a protective function. This makes it the so-called acute Phase As a reactant — A protein whose levels increase during any systemic inflammatory process in the body.
Infections, autoimmune diseases (rheumatoid arthritis), liver diseases, and even some cancers can cause elevated ferritin levels in the blood.
In practical terms, this means that blood ferritin measurements do not always accurately reflect the actual iron stores in the body. A person with an active infection or chronic inflammation may have normal or even elevated ferritin levels despite actually having an iron deficiency in the body.
what Tells us Ferritin level?
A blood ferritin test is a routine test to assess the body's iron stores. The average ferritin concentration in children is usually lower than in adults.
Low ferritin most often indicates that the body's iron stores are low. It can be an early sign of iron deficiency, which often occurs before anemia develops. In such cases, you may experience:
- Fatigue and weakness
- Decreased concentration and work capacity
- hair loss
High ferritin does not always mean excess iron in the body. Often its increase is associated with:
- With infections and inflammatory processes
- With liver diseases
- With metabolic syndrome and insulin resistance
- With autoimmune diseases
Low ferritin კონცენტრაციაAnemia Without
Low ferritin, even in the absence of anemia, is associated with symptoms such as fatigue, weakness, decreased concentration and performance, irritability, and decreased exercise tolerance.
It is also associated with restless legs syndrome and fibromyalgia-like symptoms.
Iron deficiency in pregnant women—even when anemia has not yet developed—is associated with neurodevelopmental disorders in the newborn
Studies have shown that there is a certain relationship between normal thyroid function and ferritin concentration. When treating hypothyroidism (underactive thyroid), symptoms of the disease persist until iron stores are restored.
Iron deficiency Anemia
Iron deficiency develops gradually in the body. Initially, ferritin levels decrease as the body's iron stores are depleted. Then, the amount of iron circulating in the blood decreases. Eventually, the body can no longer produce enough healthy erythrocytes (red blood cells), and iron deficiency anemia develops.
However, many people experience symptoms long before anemia develops. This condition, sometimes called non-anemic iron deficiency, often goes unnoticed because basic CBC counts may still be within normal limits.
what means FerritinHigh concentration?
Elevated ferritin levels are one of the most commonly detected laboratory changes, although in most cases this does not mean that there is excess iron in the body.
Most high ferritin levels are associated with inflammation, metabolic syndrome, obesity, insulin resistance, excessive alcohol consumption, liver disease, or infections.
In these cases, an increase in ferritin concentration is the body's response to the inflammatory process.
elevatedFerritin და Insulin resistance
High ferritin is often found in people with insulin resistance, obesity, and metabolic syndrome. In this case, an increase in ferritin does not indicate excess iron accumulation in the body, but rather reflects a low-intensity chronic inflammatory process that accompanies metabolic disorders.
During insulin resistance, adipose tissue (especially visceral fat, which accumulates around internal organs) releases inflammatory mediators — cytokines (for example, interleukin-6), which stimulate ferritin synthesis in the liver. As a result, ferritin levels in the blood may increase.
In addition, insulin resistance often develops:
- Fatty liver disease (NAFLD/MASLD) — damage to liver cells can cause ferritin to be released into the blood
- Oxidative stress and chronic inflammation, which also increase ferritin production
- Changes in iron metabolism, where iron may be stored more in tissues and less available in the blood
Naturally, high ferritin alone does not determine the diagnostics of insulin resistance; it needs to be evaluated along with other indicators:
- fasting glucose
- Insulin
- HOMA-IR index
- Glycosylated hemoglobin
- lipid profile
- Liver enzymes (ALT, AST, GGT)
In other words, high ferritin concentrations in insulin resistance are often a "signal" of metabolic stress and inflammation in the body, rather than a direct indicator of iron overload.
When indicates high Ferritin in the body Iron overload?
In rare cases, high ferritin levels can actually indicate an excess of iron in the body. The most well-known cause of this is hereditary hemochromatosis, a genetic condition in which the body absorbs excess iron from food and stores it in the liver, heart, and pancreas for decades.
Iron overload can also be caused by multiple blood transfusions or intravenous iron therapy. Other rare causes include inherited metabolic disorders that affect iron transport proteins.
Differentiating the causes of high ferritin levels is important because the treatment process is different.
These conditions can be distinguished by evaluating additional indicators, especially by determining transferrin. Transferrin is a blood protein that participates in iron transport.
- During iron overload, transferrin is significantly saturated with iron.
- When ferritin levels increase due to inflammation, transferrin levels, on the contrary, are often decreased.
Conditions,which influence makes Ferritin level
- Iron deficiency anemia: Ferritin and hemoglobin levels decrease because the body no longer has enough iron to produce erythrocytes (red blood cells).
- Chronic liver disease: Damaged liver cells release their accumulated ferritin into the blood, which increases blood ferritin levels.
- Hemochromatosis: It is a genetic disease in which iron accumulates excessively in organs and tissues. At this time, the ferritin level rises critically.
- Metabolic syndrome and obesity: Prolonged, low-intensity inflammation increases ferritin levels as the body's response to inflammation
- Rheumatoid arthritis and autoimmune diseases: Ongoing inflammation increases ferritin levels, while reducing the availability of iron for red blood cell production
- Excessive alcohol consumption: Alcohol damages liver cells and promotes inflammatory processes, which increases ferritin levels independently of iron stores in the body.
Because so many factors affect ferritin levels, their values can change frequently. To assess a particular condition and especially the body's iron stores, it is necessary to consider ferritin levels in conjunction with other laboratory and clinical data (e.g., complete blood count, transferrin saturation, inflammatory markers, etc.).
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Source:
https://scienceinsights.org/what-does-ferritin-do-and-why-your-levels-matter/
