Sideroblastic Anemia – What You Need to Know About This Lesser-Known Type of Anemia

Anemia is one of the most common conditions encountered in both adults and children. The disease is characterized by an insufficient number of healthy red blood cells. These have the role of transporting oxygen to the body’s tissues. An important aspect to remember is that there are several types of anemia, including sideroblastic anemia.

What is sideroblastic anemia? It is one of the rarest forms of the disease, affecting the bone marrow which cannot produce healthy red blood cells. Instead, it will generate sideroblasts, which are abnormal red blood cells, hence its name.

What are the characteristics of the disease and why does it occur? Sideroblastic anemia can have several causes, one of the most important being genetic. Therefore, it can be inherited.

The article below covers the causes, symptoms, and necessary treatment methods if we discover we suffer from sideroblastic anemia.

Sideroblastic anemia and its characteristics

Sideroblastic anemia is a disease characterized by the bone marrow’s inability to produce red blood cells that perform their usual role. This consists of transporting oxygen to tissues. Instead, it will generate ring sideroblasts, red blood cells that do not reach maturity and have iron accumulations in larger quantities. The iron concentration occurs around their nucleus, preventing hemoglobin formation.

As a result, sideroblastic anemia causes anemia, just like other forms of this condition. Medically, this disease is considered a group of bone marrow abnormalities, which can be either inherited or caused by an acquired syndrome.

Anemia is one of the common conditions that both children and adults can suffer from, but only its simplest form can be prevented. A diet rich in iron is what helps us have enough healthy red blood cells. There are also natural supplements that we can take for this purpose.

One of the natural alternatives is Aronia and Pomegranate Juice obtained from organically grown fruits. Both aronia and pomegranate are known for their beneficial effects on the body. Among these, the benefits for the immune system, eyes, brain, skin, and heart, as well as for anemia, are noteworthy.

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Pomegranate and aronia are considered super-fruits because they have a high content of vitamins, minerals, and antioxidants. The juice obtained from the mixture of the two helps children and adults suffering from anemia to reduce its symptoms of fatigue and lethargy, providing energy throughout the day.

Sideroblastic anemia – causes, symptoms, and types

Why does sideroblastic anemia occur and what are its symptoms? Often, it is not viewed as a disease, but rather as a manifestation of a bone marrow condition. The bone marrow can no longer create erythroblasts or red blood cells with a normal iron content in the cytoplasm, but sideroblasts. These have much higher amounts of iron in their composition, which are deposited in the form of rings around the nucleus. Thus, they become ring sideroblasts.

Normally, iron is used by the body to synthesize hemoglobin, one of the most important proteins in red blood cells. In the case of sideroblastic anemia, this process no longer occurs, so iron accumulates inside the blood cells.

Who can suffer from sideroblastic anemia?

Both adults and children can be affected by sideroblastic anemia. However, the rate of disease onset is higher in:

• elderly individuals, who are more prone to myelodysplastic syndromes and various chronic conditions;
• individuals who have undergone a bone marrow transplant, this being a complication of the procedure, as well as chemotherapy, if applicable;
• people of any age who frequently suffer from chronic infections.

These are the categories of people who can suffer from acquired sideroblastic anemia.

Sideroblastic anemia – when and how does this disease occur

Why does sideroblastic anemia occur? The answer depends on its type. The disease manifests in two main ways:

1. congenital or hereditary;
2. acquired.

Each of these also has other forms. In the case of congenital sideroblastic anemia, a genetic mutation affecting hemoglobin production is responsible for the onset of the disease. The condition is transmitted from parents to children. The mutated gene that causes it is ALAS2, which is responsible for almost 60% of cases.

When we refer to acquired sideroblastic anemia, the causes can be multiple. Among them are:

• exposure to certain substances that affect the body’s ability to use iron to produce hemoglobin;
• medications used in the treatment of tuberculosis;
• chemotherapy;
• alcohol consumption;
• nutritional deficiencies, especially vitamin B6 deficiency which can also lead to malnutrition.

In addition to these, sideroblastic anemia can also be caused by other diseases, such as Pearson syndrome and leukemia. Vitamin B6 deficiency, also known as pyridoxine, is often responsible for the onset of this condition. This vitamin is very important in hemoglobin synthesis, and its deficiency leads to the formation of sideroblasts.

Based on the causes of the disease, we will wonder if the symptoms are the same regardless of its form.

Symptoms of sideroblastic anemia

The most important thing to know about this disease is that its symptoms depend heavily on the severity of the condition. Here are the most common ones:

• fatigue;
• generalized weakness;
• difficulty breathing;
• paleness of the face;
• palpitations.

These are caused by the incorrect oxygenation of tissues, when red blood cells no longer transport the optimal amount of oxygen in the body. In addition to these, we may also experience changes in skin color, more precisely darkening of its shade, and even vision problems.

The symptoms of this type of anemia do not appear suddenly, having a gradual progression. For this reason, it can take a long time before consulting a doctor, which allows the symptoms, manifested by increasingly pronounced fatigue and lethargy, to worsen.

Physical signs in case of sideroblastic anemia

In addition to states of fatigue, sideroblastic anemia can also show us that something is wrong through some physical changes. Among these, the most frequent are:

• photosensitivity;
• appearance of petechiae (small red or purple spots that appear on the skin);
• demineralization of teeth.

Also, when it manifests in children, they may experience developmental delays.

Initially, the signs of sideroblastic anemia are minor in most cases. Therefore, we tend to ignore them. However, even a simple blood count can signal a problem, giving us reasons to investigate its cause more thoroughly. Early diagnosis of the disease offers greater chances for effective treatment. However, the first essential step is the correct identification of the type of disease.

Hereditary sideroblastic anemia

Congenital sideroblastic anemia is what we inherit from one of our parents. It is of several types, as follows:

• refractory sideroblastic anemia;
• X-linked sideroblastic anemia;
• Pearson syndrome;
• myelodysplastic syndrome.

Congenital sideroblastic anemia and hereditary sideroblastic anemia are terms that essentially refer to the same type of condition, but emphasize different aspects of the disease’s origin.

• Congenital sideroblastic anemia refers to the form of anemia present from birth, resulting from a genetic predisposition.
• Hereditary sideroblastic anemia emphasizes the fact that the disease is genetically transmitted from parents to offspring, meaning it is inherited.

Both are caused by genetic mutations and can occur from childhood, affecting hemoglobin production. It should be noted that X-linked sideroblastic anemia occurs more frequently in men, while women must inherit an abnormal chromosome from both parents to develop the disease.

Acquired sideroblastic anemia

Of the two types of sideroblastic anemias, the acquired one is more common. This happens because it has multiple causative factors. It can be divided into:

• clonal anemia or myelodysplastic syndrome;
• non-clonal or metabolic anemia.

Among the causes that favor its appearance are:

• vitamin B6 and copper deficiencies in the body;
• lead exposure;
• zinc overdose;
• hypothermia;
• alcohol consumption;
• administration of certain medications.

Furthermore, acquired sideroblastic anemia can also occur in the context of diseases such as rheumatoid arthritis and multiple myeloma.

Sideroblastic anemia – diagnosis and treatment

How is sideroblastic anemia diagnosed? To detect it, a series of tests can be performed, of which the most rapid is the hemogram. It can provide information about the presence of ring sideroblasts.

In addition to the hemogram, another test that can indicate sideroblastic anemia is the serum ferritin test. It measures the amount of iron in the body. Therefore, an increased level of it can lead the doctor to a correct diagnosis.

In situations where the test results are inconclusive, a bone marrow biopsy may be performed. It will be analyzed, and if the disease is present, the presence of ring sideroblasts will be observed.

When hereditary sideroblastic anemia is considered, genetic tests can also be performed to highlight mutations of the ALAS2 gene, located on the X chromosome. This can be the case for children. In this way, it can also be discovered which of the parents is the carrier of the mutation. Genetic testing is also useful for the parent, as they will know that they can develop the disease.

Treatment for sideroblastic anemia

There are several ways to treat sideroblastic anemia. They depend on the form of the disease. In both cases, administering vitamin B6 can help alleviate symptoms. Pyridoxine is used to aid hemoglobin synthesis. However, it does not work for all patients.

When suffering from severe sideroblastic anemia, blood transfusions may also be necessary. These are done to increase hemoglobin levels, as well as to reduce the symptoms of the disease. Iron chelators can also be administered. They have the role of removing excess iron from the body.

Also, in severe cases or when medications do not help, stem cell therapy can be used. In this way, diseased cells will be replaced with healthy ones from a donor. The procedure can restore normal production of healthy red blood cells.

Complications of sideroblastic anemia

Treatment for this type of anemia is essential, especially in the case of acquired anemia, where results are usually very good. If the anemia was caused by poisoning with toxic substances or excessive alcohol consumption, the patient can have a normal life after the cause is eliminated and appropriate treatment is applied.

Individuals suffering from hereditary sideroblastic anemia may depend on transfusions if they do not respond to pyridoxine. By regularly performing blood tests, complications of the disease can be prevented, as it can be diagnosed and treated in time.

One of the most frequent complications in the case of congenital sideroblastic anemia is due to mitochondrial abnormalities causing neuromuscular dysfunction.

Other complications of the disease include:

• iron overload, which can affect important organs such as the liver, heart, and pancreas, potentially leading to other diseases, including cirrhosis or diabetes mellitus;
• heart failure, as the heart is forced to exert extra effort to transport oxygen in the body;
• peripheral edema, so we may experience swelling of the hands and feet;
• acute myeloid leukemia caused by myelodysplastic syndrome;
• repeated infections that occur due to a weakened immune system;
• disorders of neurological and cognitive functions as a result of oxygen deprivation to the brain;
• splenomegaly or enlarged spleen caused by the lack of normal red blood cells.

How can we effectively manage the disease? The most important step is constant monitoring. This involves regular visits to the doctor for routine tests and immediate consultations in case of new symptoms or changes in health status.

In conclusion, sideroblastic anemia is one of the rarest forms of anemia we can suffer from. It is caused by the formation of abnormal red blood cells with a high iron content, which no longer allows them to transport oxygen to tissues. The condition has two forms: congenital or hereditary, inherited from one of the parents, and acquired, which occurs during life. The latter category usually affects the elderly and individuals prone to chronic infections. Its causes are quite varied. Alcohol consumption, exposure to various substances, and even the administration of certain medications can lead to the onset of the disease. Investigations necessary for diagnosing this condition include hemogram, assessment of iron levels in the blood, and, in some cases, bone marrow biopsy. Treatment may include vitamin B6 administration, blood transfusions, and in severe cases, stem cell therapy may be necessary.

References:

www.ncbi.nlm.nih.gov/books/NBK538287/

https://my.clevelandclinic.org/health/diseases/22932-sideroblastic-anemia

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9498732/

www.webmd.com/a-to-z-guides/sideroblastic-anemia

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