Project description:Gamma knife surgery (GKS) is used for treatment of various brain disorders. The effects of gamma irradiation to targeted and un-targeted regions were evaluated by monitoring gene expression changes in the unilateral irradiated (60 Gy) and contralateral un-irradiated striata in the rat. Striata of irradiated and control brains were dissected 16 h post-irradiation for analysis by rat whole genome 44K DNA oligo microarray. Results revealed 230 induced and 144 repressed genes in the irradiated striatum and 432 induced and 239 repressed genes in the un-irradiated striatum. The number of altered genes in un-irradiated striatum was more than that in irradiated striatum. Results of RT-PCR and western analyses suggested that gamma-irradiation caused cellular damage, including oxidative stress, in both striata of both hemispheres. Our present results indicate that unilateral irradiation during GKS produce bilateral effects as early as 16 h, the time-period analyzed, and these molecular changes in the un-irradiated striatum are ample proof.
Project description:To obtain and analyze early retinal changes at molecular level at 24h after ipsilateral intraorbital nerve radiation injury by gamma knife surgery Unilateral intraorbital optic nerves of three Rhesus Macaques were treated by gamma knife surgery (GKS) with irradiated doses of 15Gy, while the contralateral optic nerves and retinas served as the control. Gene expression profiles of control and affected retinas were analyzed with Affymetrix Rhesus Macaque Genome arrays at 24h after treatment
Project description:To obtain and analyze early retinal changes at molecular level at 24h after ipsilateral intraorbital nerve radiation injury by gamma knife surgery
Project description:Purpose: The goal of this study is to understand what gene changes are associated with removal of Esrrg in spiny projection neurons from the mouse striatum using injection of AAV for CamKcre Methods: Striatum from mice with or without deletion of Esrrg using AAV:CamKCre were aged to 1 month, striata were extracted and flash frozen on dry ice. RNA was isolated using the trizol method and samples were sent for sequencing.
Project description:Microarray analysis in the mouse metastatic tumor after ɣ-irradiation(ɣ-IR): non-irradiated primary tumor vs. radiated primary tumor vs. metastatic tumor after ɣ-irradiation Metastatic tumors in C6-L (rat glioma cells ) xenografted mice were studied after local treatment with fractionated γ-IR. To accurately detect the metastatic nodules after γ-IR, we observed the effect of γ-IR on distant metastatic tumor growth. Metastatic nodules after γ-IR indicated extensive colonization of C6-L cells in the lungs within 6 weeks after γ-IR. Identified and described the molecular events occurring after γ-IR through gene expression profiling to elucidate genetic changes (differentially expressed genes between the γ-IR primary tumors vs. non-γ-IR primary tumors and metastatic lung nodules vs. γ-IR primary tumors). We investigated the change of gene expression profile in the γ-IR primary tumors vs. non-γ-IR primary tumors and metastatic lung nodules vs. γ-IR primary tumors in rat glioma (C6-L cell) xenograft model.
Project description:Lowering of mutant Huntingtin (mHtt) transcript and protein levels is considered a therapeutic strategy for people with Huntington’s disease (HD). However, the effects of mHtt lowering are incompletely understood. In this study, the proteomic changes in striatum upon Htt lowering were analyzed, using an inducible HD-knock-in LacQ140 mouse model with temporal control of mHtt-Q140 expression. The proteomic HD-disease signature in LacQ140 mouse striata was defined, using label-free quantification by liquid chromatography-mass spectrometry in data-independent acquisition mode. From the over 8000 protein groups identified in the striata, a disease signature of differentially regulated proteins in LacQ140 mice was identified, compared to wildtype control mice at 2-, 6-, 9- and 12-months of age. The effect of mHtt lowering on striatal proteomics was explored in LacQ140 mice, in which mHtt was lowered by repressing its transcription starting at an early or late time point, before or after onset of behavioral, molecular and aggregation phenotypes.
Project description:A set of changes is identified in the transcription profile associated with the long-term, but not the acute, response to radiation exposure. The study was performed in vivo using zebrafish. To study the long-term response, 24 hour post-fertilization embryos were exposed to 0.1 Gy (low dose) or 1.0 Gy (moderate dose) of whole-body gamma radiation and allowed to develop for 16 weeks. Liver mRNA profiles were then analyzed using the Affymetrix microarray platform, with validation by quantitative PCR. To be able to compare this to the acute response, 16-week old adults were exposed at the same doses and analyzed after 4 hours. We used 5 treatment groups: A=non-irradiated control, allowed to develop for 16 weeks; B=low-dose (0.1 Gy) irradiated, allowed to develop for 16 weeks; C=high-dose (1.0 Gy) irradiate, allowed to develop for 16 weeks; D=16 week old adults irradiated at low dose (0.1 Gy); E=16 week old adults irradiate at high dose (1.0 Gy)
Project description:Microarray analysis in the mouse metastatic tumor after ɣ-irradiation(ɣ-IR): non-irradiated primary tumor vs. radiated primary tumor vs. metastatic tumor after ɣ-irradiation Metastatic tumors in C6-L (rat glioma cells ) xenografted mice were studied after local treatment with fractionated γ-IR. To accurately detect the metastatic nodules after γ-IR, we observed the effect of γ-IR on distant metastatic tumor growth. Metastatic nodules after γ-IR indicated extensive colonization of C6-L cells in the lungs within 6 weeks after γ-IR. Identified and described the molecular events occurring after γ-IR through gene expression profiling to elucidate genetic changes (differentially expressed genes between the γ-IR primary tumors vs. non-γ-IR primary tumors and metastatic lung nodules vs. γ-IR primary tumors).
Project description:The selection of specific miRNAs by exosomes and their release from cultured melanocytes after exposure to solar UVR (UVA+UVB) have activities in inducing these cells into a premature senescence. In this analysis, human TaqMan microRNA array cards A+B were used to measure the relative expression of miRNAs in exosomes isolated from the irradiated and un-irradiated melanocytes.
