Glucocorticoid Resistance ∞ Area

Glucocorticoid Resistance

Meaning

Glucocorticoid resistance describes a condition where target tissues exhibit reduced sensitivity to glucocorticoid hormones, like cortisol, despite normal or elevated circulating levels. This diminished cellular response impairs the body’s ability to mediate their diverse physiological effects, including metabolism, immune modulation, and stress adaptation. Cells simply do not adequately respond to the hormonal signal.

Context

This resistance operates within the hypothalamic-pituitary-adrenal (HPA) axis and its downstream target cells. Cortisol, a primary glucocorticoid, is essential for maintaining systemic homeostasis, influencing glucose metabolism, inflammatory processes, and cardiovascular function. When cells become resistant, normal feedback mechanisms are disrupted, leading to dysregulation across organ systems.

Significance

Clinically, glucocorticoid resistance can present with symptoms mimicking either cortisol excess or deficiency. Patients might experience chronic fatigue, hypertension, or altered immune responses. Recognizing this resistance is vital, as it impacts treatment strategies for inflammatory and autoimmune diseases where exogenous glucocorticoids are commonly prescribed.

Mechanism

The underlying biological mechanism involves molecular defects within the glucocorticoid receptor (GR), mediating cortisol’s actions. These defects can be genetic, affecting GR gene expression, structure, or binding affinity. Acquired mechanisms, like post-translational modifications or dysregulation of GR co-regulators, can also impair receptor’s ability to modulate gene transcription.

Application

Glucocorticoid resistance manifests clinically through varied presentations, from biochemical anomalies to systemic dysfunction. In practice, awareness guides physicians when patients show inadequate response to standard corticosteroid therapies for conditions like asthma or rheumatoid arthritis. This prompts re-evaluation and investigation of the patient’s glucocorticoid signaling.

Metric

Assessing glucocorticoid resistance involves clinical observation and endocrine laboratory tests. Diagnostic approaches include dynamic stimulation or suppression tests, like the dexamethasone suppression test, to evaluate HPA axis and cellular responsiveness. Measurement of urinary free cortisol or salivary cortisol rhythms also provides insights.

Risk

Unrecognized or mismanaged glucocorticoid resistance poses significant clinical risks. Patients may receive escalating, ineffective doses of corticosteroids, leading to adverse effects like osteoporosis, hyperglycemia, and increased infection susceptibility, without therapeutic benefit. Underlying inflammatory or metabolic conditions may remain inadequately controlled, perpetuating symptoms and increasing complications.

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