Mechanism of action at the cellular level
The pharmacodynamics of purple coneflower (Echinacea purpurea) preparations is based on the sequential and comprehensive activation of the body's defense systems. First and foremost, this concerns the cellular link of immunity, where the drug acts on several cell types simultaneously.
- Macrophage stimulation: The preparations significantly enhance the phagocytic activity of macrophages. Monocyte-macrophage lineage cells more actively capture, engulf, and digest foreign antigens.
- Interleukin production: Under the influence of active substances of Echinacea, macrophages sharply increase the production of interleukin-1 (IL-1). This crucial mediator plays a key role in the development of protective inflammatory reactions and promotes the subsequent release of a whole cascade of other cytokines.
- Effect on granulocytes: There is a pronounced enhancement of granulocyte chemotaxis. Due to this, leukocytes migrate faster and more purposefully from the bloodstream directly into the focus of inflammation.
Together, these cellular processes provide a powerful anti-inflammatory effect and increase the body's overall nonspecific resistance to infections.
Effect on the humoral link and hematopoiesis
In addition to pronounced cellular reactions, herbal biogenic stimulants based on Echinacea actively interfere with the functioning of humoral immunity and basic blood cell formation processes.
- Bone marrow hematopoiesis: Echinacea directly stimulates hematopoiesis in the red bone marrow. The main clinical and laboratory manifestation of this pharmacodynamic effect is a predictable increase in the total leukocyte count in peripheral blood.
- T-helper activation: The preparations increase the functional activity of T-helper cells, which perform a regulatory function and are necessary for the full initiation of the humoral immune response.
- Antibody synthesis: There is a significant acceleration of the transformation of B-lymphocytes into mature plasma cells. It is plasmocytes that are responsible for enhanced antibody production, which ultimately consolidates the body's ability to effectively resist pathogens.
Indications for prescription and representatives
In clinical practice, Echinacea preparations are used primarily as adaptogens for the correction of weakened immunity. The pharmacological market features two main preparations with identical properties: Immunal (which is purple coneflower herb juice) and its analogue Estifan (available as dry purple coneflower extract).
Main indications for use:
- Routine prevention of colds and seasonal influenza in risk group patients.
- Complex therapy of secondary immunodeficiencies (marked weakening of immunity). Prescription is especially relevant when the suppression of protective forces is caused by aggressive external factors or heavy treatment:
- Exposure to ionizing radiation or excessive ultraviolet (UV) irradiation.
- Undergoing toxic chemotherapy courses.
- Prolonged and massive antibiotic therapy that depletes the patient's own defensive reserves.
Strict contraindications
Despite its status as an over-the-counter herbal adaptogen, Echinacea is a potent immunostimulant. This makes its use absolutely unacceptable in a number of severe systemic pathologies. Excessive stimulation of the immune system or hematopoiesis in these diseases can lead to a fatal exacerbation.
Echinacea preparations are strictly contraindicated in:
- Tuberculosis: uncontrolled immune activation can unpredictably affect the course of specific granulomatous inflammation in the lungs and other organs.
- Leukemias: since Echinacea stimulates bone marrow hematopoiesis and leukocyte proliferation, in oncohematological diseases this can provoke a rapid progression of the tumor clone.
- Collagenoses: in systemic connective tissue diseases of autoimmune nature, immune stimulation exacerbates damage to one's own tissues.
- Multiple sclerosis: as with collagenoses, stimulation of T-helper activity and antibody production can repeatedly enhance the autoimmune attack on the myelin sheaths of nerve fibers.
To reliably remember the contraindications to prescribing Echinacea, use the acronym CLTM: Collagenoses, Leukemias, Tuberculosis, Multiple sclerosis. In these pathologies, "spurring" immunity and hematopoiesis is deadly dangerous.
Class and exam questions
Due to what mechanism does Echinacea increase the number of leukocytes in the blood?
Echinacea preparations directly stimulate bone marrow hematopoiesis. This leads to the enhanced formation and release of new leukocyte pools into the bloodstream.
How do Echinacea preparations affect humoral immunity?
They increase the functional activity of T-helper cells and significantly accelerate the transformation of B-lymphocytes into plasma cells. As a result of this cascade of reactions, antibody production is multiplied.
In which cases is the use of Immunal or Estifan justified in secondary immunodeficiencies?
They are prescribed if weakening of immunity is triggered by prolonged antibiotic therapy, chemotherapy courses, as well as the aggressive impact of ionizing radiation or UV irradiation.
Why is Echinacea strictly contraindicated in leukemias?
The main mechanism of action of Echinacea includes powerful stimulation of bone marrow hematopoiesis. In leukemias, when the process of leukocyte proliferation is already malignant in nature, additional stimulation of hematopoiesis is strictly prohibited, as it will accelerate tumor growth.
What else to study on this topic
- Biogenic stimulants and adaptogens: general pharmacological characteristics of the group
- The role of interleukin-1 (IL-1) and cytokines in the development of the inflammatory response
- Cellular mechanisms of phagocytosis and granulocyte chemotaxis
- Interaction of T-helper cells and B-lymphocytes in the process of antibody production
- Pathogenesis of secondary immunodeficiencies against the background of chemotherapy and radiation therapy
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