TY - JOUR
T1 - Androgens modulate structure and function of the suprachiasmatic nucleus brain clock
AU - Karatsoreos, Ilia N.
AU - Butler, Matthew P.
AU - Lesauter, Joseph
AU - Silver, Rae
PY - 2011/5
Y1 - 2011/5
N2 - Gonadal hormones can modulate circadian rhythms in rodents and humans, and androgen receptors are highly localized within the core region of the mouse suprachiasmatic nucleus (SCN) brain clock. Although androgens are known to modulate neural plasticity in other CNS compartments, the role of androgens and their receptors on plasticity in the SCN is unexplored. In the present study, we ask whether androgens influence the structure and function of the mouse SCN by examining the effects of gonadectomy (GDX) on the structure of the SCN circuit and its responses to light, including induction of clock genes and behavioral phase shifting. We found that after GDX, glial fibrillary acidic protein increased with concomitant decreases in the expression of the synaptic proteins synaptophysin and postsynaptic density 95. We also found that GDX exerts effects on the molecular and behavioral responses to light that are phase dependent. In late night [circadian time (CT)21], GDX increased lightinduced mPer1 but not mPer2 expression compared with intact (INT) controls. In contrast, in early night (CT13.5), GDX decreased light induced mPer2 but had no effect on mPer1. At CT13.5, GDX animals also showed larger phase delays than did INT. Treatment of GDX animals with the nonaromatizable androgen dihydrotestosterone restored glial fibrillary acidic protein, postsynaptic density 95, and synaptophysin in the SCN and reinstated the INT pattern of molecular and behavioral responses to light. Together, the results reveal a role for androgens in regulating circuitry in the mouse SCN, with functional consequences for clock gene expression and behavioral responses to photic phase resetting stimuli.
AB - Gonadal hormones can modulate circadian rhythms in rodents and humans, and androgen receptors are highly localized within the core region of the mouse suprachiasmatic nucleus (SCN) brain clock. Although androgens are known to modulate neural plasticity in other CNS compartments, the role of androgens and their receptors on plasticity in the SCN is unexplored. In the present study, we ask whether androgens influence the structure and function of the mouse SCN by examining the effects of gonadectomy (GDX) on the structure of the SCN circuit and its responses to light, including induction of clock genes and behavioral phase shifting. We found that after GDX, glial fibrillary acidic protein increased with concomitant decreases in the expression of the synaptic proteins synaptophysin and postsynaptic density 95. We also found that GDX exerts effects on the molecular and behavioral responses to light that are phase dependent. In late night [circadian time (CT)21], GDX increased lightinduced mPer1 but not mPer2 expression compared with intact (INT) controls. In contrast, in early night (CT13.5), GDX decreased light induced mPer2 but had no effect on mPer1. At CT13.5, GDX animals also showed larger phase delays than did INT. Treatment of GDX animals with the nonaromatizable androgen dihydrotestosterone restored glial fibrillary acidic protein, postsynaptic density 95, and synaptophysin in the SCN and reinstated the INT pattern of molecular and behavioral responses to light. Together, the results reveal a role for androgens in regulating circuitry in the mouse SCN, with functional consequences for clock gene expression and behavioral responses to photic phase resetting stimuli.
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U2 - 10.1210/en.2010-1398
DO - 10.1210/en.2010-1398
M3 - Article
C2 - 21363939
AN - SCOPUS:79955456568
SN - 0013-7227
VL - 152
SP - 1970
EP - 1978
JO - Endocrinology
JF - Endocrinology
IS - 5
ER -