Protein Drugs

Definition of Protein Drugs

• These are therapeutic agents derived from proteins (e.g., antibodies, enzymes, hormones) used to treat various medical conditions.
• They are typically produced using recombinant DNA technology.

Mechanism of Action

• Protein drugs work by:
• Binding to specific molecules (e.g., cytokines, receptors)
• Modulating biological activity
• Replacing missing/dysfunctional proteins
• Inhibiting enzymes
• Targeting specific cells or signaling pathways

Pharmacological Considerations

1. Route of Administration: Often parenteral (IV, subcutaneous) because proteins are degraded in the GI tract.
2. Immunogenicity: Protein drugs can be recognized as foreign by the immune system, potentially triggering anti-drug antibodies.
3. Pharmacokinetics:
   • Large molecular size → limited distribution.
   • Often have longer half-lives but can be cleared by the reticuloendothelial system.
4. Storage and Stability: Must be handled carefully (temperature-sensitive, easily denatured).

Types & Examples of Protein Drugs

1. Monoclonal Antibodies (mAbs)

   • Target specific antigens (e.g., cancer cells, inflammatory proteins)
   • Uses: Cancer, autoimmune diseases, infections

2. Enzyme Replacement Therapy

   • Replace deficient/defective enzymes
   • Examples: Gaucher disease, Fabry disease

3. Hormone Therapy

   • Replace or supplement hormones
   • Examples: Insulin (diabetes), Growth hormone (growth disorders)

4. Cytokines

   • Regulate immune responses
   • Uses: Cancer, autoimmune disorders

5. Blood Clotting Factors

   • Treat bleeding disorders (e.g., hemophilia)

Uses

1. Autoimmune disorders
2. Cancer treatment
3. Hormonal disorders
4. Rare genetic conditions
5. Infectious diseases

Side Effects

1. Allergic reactions
2. Injection site reactions
3. Flu-like symptoms
4. Nausea, vomiting
5. Blood clotting issues
6. Immune system disturbances

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