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Characterization of Metabolic Status in Nonhuman Primates with the Intravenous Glucose Tolerance Test
Published on: November 13, 2016
The glucocorticoid insensitivity syndrome
1Department of Medicine, Erasmus University, Rotterdam, The Netherlands.
Abstract:
Recent studies demonstrate that primary (hereditary) abnormalities in the glucocorticoid receptor gene make 6.6% of the normal population relatively 'hypersensitive' to glucocorticoids, while 2.3% are relatively 'resistant'. These abnormalities might explain the well-known phenomenon that some individuals develop severe adverse effects during therapy with a low dose of glucocorticosteroids, while others do not develop side effects even during long-term therapy with a much higher dose. This heterogeneity in glucocorticoid sensitivity in the normal population might eventually allow the prediction of a 'safe' dose of glucocorticosteroids in individual patients. 'Resistance' to the beneficial clinical effects of glucocorticosteroid therapy in some patients with severe rheumatoid arthritis and asthma is probably seldom related to generalized primary (hereditary) glucocorticoid resistance. In most patients this 'resistance' seems to be acquired and localized to the inflammation sites, where it is caused by high local cytokine production which interferes with glucocorticoid action. Recognition of localized, acquired glucocorticoid resistance is of great importance, as alternative drug therapy with other immune-modulating drugs, such as cyclosporin and methotrexate, should be considered. Chronic high-dose glucocorticosteroid treatment in such patients insufficiently reduces symptomatology, while generalized side effects occur, as the rest of the body of the patient has a normal sensitivity to these drugs.
Insights
Genetic variations in glucocorticoid receptor genes cause hypersensitivity or resistance in some individuals. This explains varied responses to glucocorticosteroid therapy and guides personalized dosing for patients.
Area of Science:
- Pharmacogenomics
- Endocrinology
- Immunology
Background:
- Glucocorticosteroids are widely used but exhibit variable patient responses.
- Individual sensitivity to glucocorticoids differs due to genetic factors.
- Adverse effects and therapeutic resistance are common clinical challenges.
Purpose of the Study:
- To investigate the prevalence of hereditary glucocorticoid receptor gene abnormalities.
- To explain the heterogeneity in patient response to glucocorticosteroid therapy.
- To differentiate between hereditary and acquired glucocorticoid resistance.
Main Methods:
- Analysis of genetic variations in the glucocorticoid receptor gene.
- Review of clinical data on patient responses to glucocorticosteroid treatment.
- Examination of cytokine profiles at inflammation sites.
Main Results:
- Hereditary gene abnormalities affect 6.6% (hypersensitive) and 2.3% (resistant) of the population.
- Genetic variations explain differing side effect profiles and therapeutic efficacy.
- Acquired resistance at inflammation sites, driven by cytokines, is common in rheumatoid arthritis and asthma.
Conclusions:
- Genetic screening may predict safe glucocorticosteroid doses.
- Acquired, localized resistance necessitates alternative immunosuppressive therapies.
- Understanding glucocorticoid sensitivity is crucial for effective treatment strategies.
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