A nurse is caring for a client who has systemic lupus erythematosus and is prescribed prednisone, a glucocorticoid. What is the primary mechanism of action of prednisone in this condition?
A It inhibits the synthesis of inflammatory mediators and suppresses the activation and proliferation of immune cells.
B It blocks the activation of T cells by inhibiting the enzyme calcineurin, which is required for the transcription of interleukin-2.
C It interferes with the synthesis of nucleic acids, which are essential for the replication and function of immune cells.
D It binds to specific antigens or receptors on the surface of immune cells and either neutralizes them or induces their destruction.
The correct answer and Explanation is :
The correct answer is:
A. It inhibits the synthesis of inflammatory mediators and suppresses the activation and proliferation of immune cells.
Explanation:
Prednisone is a type of glucocorticoid that plays a crucial role in managing inflammatory and autoimmune conditions like systemic lupus erythematosus (SLE). Its primary mechanism of action involves several key processes related to immune system modulation and inflammation control.
- Inhibition of Inflammatory Mediators: Prednisone works by inhibiting the synthesis of various inflammatory mediators such as prostaglandins, leukotrienes, and cytokines. These mediators are crucial for the inflammatory response and are involved in the pathology of autoimmune diseases like SLE. By suppressing their production, prednisone helps reduce inflammation and the associated symptoms.
- Suppression of Immune Cell Activation and Proliferation: Prednisone affects the immune system by suppressing the activation and proliferation of immune cells, including T cells and B cells. This suppression is achieved through the downregulation of genes responsible for immune cell activation and proliferation. In SLE, where the immune system mistakenly attacks healthy tissues, reducing the activity of these cells helps to mitigate the autoimmune response and decrease disease activity.
- Modulation of Gene Expression: At a cellular level, prednisone binds to glucocorticoid receptors in the cytoplasm of cells, leading to the activation or inhibition of specific genes. This modulation of gene expression affects the production of proteins involved in inflammation and immune response. The overall result is a decreased inflammatory response and reduced immune system activity.
By addressing these processes, prednisone helps manage symptoms and prevent flare-ups in conditions like SLE, where inflammation and immune system dysregulation play a central role in disease pathology.