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A plant-derived glucocorticoid receptor modulator attenuates inflammation without provoking ligand-induced resistance

Valerie Gossye (UGent) , Dirk Elewaut (UGent) , Katrien Van Beneden (UGent) , Pieter Dewint (UGent) , Guy Haegeman (UGent) and Karolien De Bosscher (UGent)
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Organization
Abstract
Background: Acquired resistance to glucocorticoids constitutes a major clinical challenge, often overlooked in the search for improved alternatives to classic steroids. We sought to unravel how two glucocorticoid receptor-activating compounds, dexamethasone and Compound A, influence glucocorticoid receptor levels and how this can be correlated to their gene regulatory potential. Methods: Compound A and dexamethasone were applied in a short-term and long-term treatment protocol. By quantitative PCR analysis in fibroblast-like synoviocytes (FLS) the gene regulatory potential of both compounds in the two experimental conditions was analysed. A parallel Western blot assay revealed the glucocorticoid receptor protein levels in both conditions (ex vivo). In addition, this study examined the effect of systemic administration of dexamethasone and Compound A, in concentrations effective to inhibit collagen-induced arthritis, in DBA/1 mice on glucocorticoid receptor levels (in vivo). Results: Compound A does not induce a homologous downregulation of glucocorticoid receptor in vivo and ex vivo, thereby retaining its anti-inflammatory effects after prolonged treatment in FLS. This is in sharp contrast to dexamethasone, showing a direct link between prolonged dexamethasone treatment, decreasing glucocorticoid receptor levels, and the abolishment of inflammatory gene repression in FLS. It was also observed that the acquired low receptor levels after prolonged dexamethasone treatment are still sufficient to sustain the transactivation of endogenous glucocorticoid-responsive element-driven genes in FLS, a mechanism partly held accountable for the metabolic side-effects. Conclusion: Compound A is less likely to evoke therapy resistance, as it does not lead to homologous glucocorticoid receptor downregulation, which is in contrast to classic glucocorticoids.
Keywords
FACTOR-KAPPA-B, DEPENDENT DOWN-REGULATION, RHEUMATOID-ARTHRITIS, INTERLEUKIN-6 GENE, NUCLEAR RECEPTORS, CROSS-TALK, TRANSACTIVATION, TRANSCRIPTION, SYNOVIOCYTES, MECHANISMS

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MLA
Gossye, Valerie, Dirk Elewaut, Katrien Van Beneden, et al. “A Plant-derived Glucocorticoid Receptor Modulator Attenuates Inflammation Without Provoking Ligand-induced Resistance.” ANNALS OF THE RHEUMATIC DISEASES 69.1 (2010): 291–296. Print.
APA
Gossye, V., Elewaut, D., Van Beneden, K., Dewint, P., Haegeman, G., & De Bosscher, K. (2010). A plant-derived glucocorticoid receptor modulator attenuates inflammation without provoking ligand-induced resistance. ANNALS OF THE RHEUMATIC DISEASES, 69(1), 291–296.
Chicago author-date
Gossye, Valerie, Dirk Elewaut, Katrien Van Beneden, Pieter Dewint, Guy Haegeman, and Karolien De Bosscher. 2010. “A Plant-derived Glucocorticoid Receptor Modulator Attenuates Inflammation Without Provoking Ligand-induced Resistance.” Annals of the Rheumatic Diseases 69 (1): 291–296.
Chicago author-date (all authors)
Gossye, Valerie, Dirk Elewaut, Katrien Van Beneden, Pieter Dewint, Guy Haegeman, and Karolien De Bosscher. 2010. “A Plant-derived Glucocorticoid Receptor Modulator Attenuates Inflammation Without Provoking Ligand-induced Resistance.” Annals of the Rheumatic Diseases 69 (1): 291–296.
Vancouver
1.
Gossye V, Elewaut D, Van Beneden K, Dewint P, Haegeman G, De Bosscher K. A plant-derived glucocorticoid receptor modulator attenuates inflammation without provoking ligand-induced resistance. ANNALS OF THE RHEUMATIC DISEASES. 2010;69(1):291–6.
IEEE
[1]
V. Gossye, D. Elewaut, K. Van Beneden, P. Dewint, G. Haegeman, and K. De Bosscher, “A plant-derived glucocorticoid receptor modulator attenuates inflammation without provoking ligand-induced resistance,” ANNALS OF THE RHEUMATIC DISEASES, vol. 69, no. 1, pp. 291–296, 2010.
@article{1095139,
  abstract     = {Background: Acquired resistance to glucocorticoids constitutes a major clinical challenge, often overlooked in the search for improved alternatives to classic steroids. We sought to unravel how two glucocorticoid receptor-activating compounds, dexamethasone and Compound A, influence glucocorticoid receptor levels and how this can be correlated to their gene regulatory potential.
Methods: Compound A and dexamethasone were applied in a short-term and long-term treatment protocol. By quantitative PCR analysis in fibroblast-like synoviocytes (FLS) the gene regulatory potential of both compounds in the two experimental conditions was analysed. A parallel Western blot assay revealed the glucocorticoid receptor protein levels in both conditions (ex vivo). In addition, this study examined the effect of systemic administration of dexamethasone and Compound A, in concentrations effective to inhibit collagen-induced arthritis, in DBA/1 mice on glucocorticoid receptor levels (in vivo).
Results: Compound A does not induce a homologous downregulation of glucocorticoid receptor in vivo and ex vivo, thereby retaining its anti-inflammatory effects after prolonged treatment in FLS. This is in sharp contrast to dexamethasone, showing a direct link between prolonged dexamethasone treatment, decreasing glucocorticoid receptor levels, and the abolishment of inflammatory gene repression in FLS. It was also observed that the acquired low receptor levels after prolonged dexamethasone treatment are still sufficient to sustain the transactivation of endogenous glucocorticoid-responsive element-driven genes in FLS, a mechanism partly held accountable for the metabolic side-effects.
Conclusion: Compound A is less likely to evoke therapy resistance, as it does not lead to homologous glucocorticoid receptor downregulation, which is in contrast to classic glucocorticoids.},
  author       = {Gossye, Valerie and Elewaut, Dirk and Van Beneden, Katrien and Dewint, Pieter and Haegeman, Guy and De Bosscher, Karolien},
  issn         = {0003-4967},
  journal      = {ANNALS OF THE RHEUMATIC DISEASES},
  keywords     = {FACTOR-KAPPA-B,DEPENDENT DOWN-REGULATION,RHEUMATOID-ARTHRITIS,INTERLEUKIN-6 GENE,NUCLEAR RECEPTORS,CROSS-TALK,TRANSACTIVATION,TRANSCRIPTION,SYNOVIOCYTES,MECHANISMS},
  language     = {eng},
  number       = {1},
  pages        = {291--296},
  title        = {A plant-derived glucocorticoid receptor modulator attenuates inflammation without provoking ligand-induced resistance},
  url          = {http://dx.doi.org/10.1136/ard.2008.102871},
  volume       = {69},
  year         = {2010},
}

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