Table of Contents

• What is Human Alpha1-Proteinase Inhibitor?
• What Conditions Does It Treat?
• How Does It Work?
• How Is It Administered?
• Effectiveness
• Potential Side Effects
• Ongoing Research

What is Human Alpha1-Proteinase Inhibitor?

Human Alpha1-Proteinase Inhibitor, also known as alpha-1 antitrypsin or AAT, is a protein naturally produced by the liver^[1]. It plays a crucial role in protecting the lungs from damage caused by inflammation. In some people, a genetic condition called Alpha-1 Antitrypsin Deficiency (AATD) results in low levels or absence of this important protein^[2].

What Conditions Does It Treat?

Human Alpha1-Proteinase Inhibitor is primarily used to treat:

• Alpha-1 Antitrypsin Deficiency (AATD): A genetic condition that can lead to serious lung and liver problems^[3].
• Emphysema: A type of chronic obstructive pulmonary disease (COPD) that damages the air sacs in the lungs, making it difficult to breathe^[4].

Research is also exploring its potential use in other conditions, such as:

• Graft-versus-host disease (GVHD): A complication that can occur after bone marrow or stem cell transplants^[5].

How Does It Work?

Human Alpha1-Proteinase Inhibitor works by replacing the missing or deficient protein in people with AATD. This helps to:

• Protect lung tissue from damage caused by enzymes released during inflammation
• Slow down the progression of emphysema
• Reduce the risk of lung infections

In the context of GVHD, researchers believe it may help modulate the immune response and reduce inflammation^[5].

How Is It Administered?

Human Alpha1-Proteinase Inhibitor can be administered in different ways:

• Intravenous infusion: The medication is given directly into a vein, typically once a week^[1].
• Inhalation: Some forms of the medication, such as Kamada-AAT for Inhalation, are being developed for inhalation use. This method allows the medication to be delivered directly to the lungs^[6].

Effectiveness

Studies have shown that Human Alpha1-Proteinase Inhibitor can be effective in:

• Slowing down the progression of emphysema in people with AATD
• Reducing the frequency of lung infections
• Improving lung function and quality of life for patients with AATD

However, it’s important to note that while the treatment can slow disease progression, it cannot reverse existing lung damage^[4].

Potential Side Effects

Like all medications, Human Alpha1-Proteinase Inhibitor can cause side effects. Common side effects may include:

• Headache
• Dizziness
• Nausea
• Fatigue
• Infusion site reactions (for intravenous administration)

Serious allergic reactions are rare but possible. Patients should seek immediate medical attention if they experience signs of an allergic reaction, such as difficulty breathing, hives, or swelling of the face, lips, tongue, or throat^[1].

Ongoing Research

Several clinical trials are currently underway to further explore the potential of Human Alpha1-Proteinase Inhibitor:

• A study comparing a new formulation (INBRX-101) to plasma-derived Alpha1-Proteinase Inhibitor for AATD emphysema^[7].
• Research on its effectiveness in preventing graft-versus-host disease in patients undergoing hematopoietic cell transplant^[5].
• A long-term study evaluating the efficacy and safety of inhaled Alpha1-Proteinase Inhibitor (Kamada-AAT for Inhalation) in patients with AATD and moderate to severe airflow limitation^[6].

These ongoing studies aim to improve treatment options and potentially expand the use of Human Alpha1-Proteinase Inhibitor to benefit more patients.