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2015 ; 5
(ä): 17476
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Effects of histamine H1 receptor signaling on glucocorticoid receptor activity
Role of canonical and non-canonical pathways
#MMPMID26635083
Zappia CD
; Granja-Galeano G
; Fernández N
; Shayo C
; Davio C
; Fitzsimons CP
; Monczor F
Sci Rep
2015[Dec]; 5
(ä): 17476
PMID26635083
show ga
Histamine H1 receptor (H1R) antagonists and glucocorticoid receptor (GR) agonists
are used to treat inflammatory conditions such as allergic rhinitis, atopic
dermatitis and asthma. Consistent with the high morbidity levels of such
inflammatory conditions, these receptors are the targets of a vast number of
approved drugs, and in many situations their ligands are co-administered.
However, this drug association has no clear rationale and has arisen from
clinical practice. We hypothesized that H1R signaling could affect GR-mediated
activity, impacting on its transcriptional outcome. Indeed, our results show a
dual regulation of GR activity by the H1R: a potentiation mediated by G-protein
?? subunits and a parallel inhibitory effect mediated by G?q-PLC pathway.
Activation of the H1R by its full agonists resulted in a composite potentiating
effect. Intriguingly, inactivation of the G?q-PLC pathway by H1R inverse agonists
resulted also in a potentiation of GR activity. Moreover, histamine and
clinically relevant antihistamines synergized with the GR agonist dexamethasone
to induce gene transactivation and transrepression in a gene-specific manner. Our
work provides a delineation of molecular mechanisms underlying the widespread
clinical association of antihistamines and GR agonists, which may contribute to
future dosage optimization and reduction of well-described side effects
associated with glucocorticoid administration.