Effect of ovarian steroids on gene expression related to synapse assembly in serotonin neurons of macaques.

Effect of ovarian steroids on gene expression related to synapse assembly in serotonin neurons of macaques.
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DOI:
10.1002/jnr.23004
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发表时间:
2012-07
影响因子:
4.2
通讯作者:
Reddy, Arubala P.
Reddy, Arubala P.
中科院分区:
医学3区
文献类型:
--
作者:
Bethea, Cynthia L.;Reddy, Arubala P.

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Dendritic spines are the elementary structural units of neural plasticity. In a model of hormone replacement therapy (HT), we sought the effect of estradiol (E) and progesterone (P) on gene expression related to synapse assembly in a laser captured preparation enriched for serotonin neurons from rhesus macaques. Microarray analysis was conducted (n=2 animals/treatment) and the results confirmed for pivotal genes with qRT-PCR on additional laser captured material (n=3 animals/treatment). Ovariectomized rhesus macaques were treated with either placebo, E or E+P via Silastic implants for 1 month. The midbrain was obtained, sectioned and immunostained for tryptophan hydroxylase (TPH). TPH-positive neurons were laser captured using an Arcturus Laser Dissection Microscope (Pixel II). RNA from laser captured serotonin neurons was hybridized to Rhesus Affymetrix GeneChips for screening purposes. There was a 2-fold or greater change in the expression of 63 probe sets in the Cell Adhesion Molecule (CAM) category, and 31 probe sets in the Synapse Assembly category were similarly altered in E and E+P treated animals. qRT-PCR assays showed that E-treatment induced a significant increase in Ephrin receptor A4 (EPHA4) and in Integrin A8 (ITGA8), but not Ephrin receptor B4 (EPHB4) or Integrin B8 (ITGB8) expression. E also increased expression of cadherin 11 (CDH11), neuroligin 3 (NLGN3), neurexin 3 (NRXN3), syndecan 2 (SCD2) and neural cell adhesion molecule (NCAM) compared to placebo. Supplemental P treatment suppressed E-induced gene expression. In summary, ovarian steroids target gene expression of adhesion molecules in serotonin neurons that are important for synapse assembly.
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