Analysis of genes causing hypertension and stroke in spontaneously hypertensive rats: Gene expression profiles in the brain

Yoshida,Momoko; Watanabe,Yuko; Yamanishi,Kyosuke; Yamashita,Akifumi; Yamamoto,Hideyuki; Okuzaki,Daisuke; Shimada,Kazunori; Nojima,Hiroshi; Yasunaga,Teruo; Okamura,Haruki; Matsunaga,Hisato; Yamanishi,Hiromichi

doi:10.3892/ijmm.2014.1631

Analysis of genes causing hypertension and stroke in spontaneously hypertensive rats: Gene expression profiles in the brain

Authors:
- Momoko Yoshida
- Yuko Watanabe
- Kyosuke Yamanishi
- Akifumi Yamashita
- Hideyuki Yamamoto
- Daisuke Okuzaki
- Kazunori Shimada
- Hiroshi Nojima
- Teruo Yasunaga
- Haruki Okamura
- Hisato Matsunaga
- Hiromichi Yamanishi
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Affiliations: Hirakata General Hospital for Developmental Disorders, Hirakata, Osaka 573-0122, Japan, Department of Neuropsychiatry, Hyogo College of Medicine, Nishinomiya, Hyogo 663-8501, Japan, Department of Genome Informatics, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka 565-0871, Japan, Institute for Advanced Medical Sciences, Hyogo College of Medicine, Nishinomiya, Hyogo 663-8501, Japan, DNA-Chip Development Center for Infectious Diseases, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka 565-0871, Japan
Published online on: January 22, 2014 https://doi.org/10.3892/ijmm.2014.1631
Pages: 887-896

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Abstract

Spontaneously hypertensive rats (SHR) and stroke-prone SHR (SHRSP) are frequently used as rat models not only of essential hypertension and stroke, but also of attention-deficit hyperactivity disorder (ADHD). Normotensive Wistar-Kyoto rats (WKY) are used as the control rats in these cases. An increasing number of studies has demonstrated the critical role of the central nervous system in the development and maintenance of hypertension. In a previous study, we analyzed the gene expression profiles in the adrenal glands of SHR. Thus, in this study, we analyzed gene expression profiles in the brains of SHR in order to identify the genes responsible for causing hypertension and stroke, as well as those involved in ADHD. Using genome-wide microarray technology, we examined the gene expression profiles in the brains of 3 rat strains (SHR, SHRSP and WKY) when the rats were 3 and 6 weeks of age, a period in which the rats are considered to be in a pre-hypertensive state. Gene expression profiles in the brain were compared between SHR and WKY, and between SHRSP and SHR. A total of 179 genes showing a >4- or <-4-fold change in expression were isolated, and candidate genes were selected using two different web tools: the first tool was the Database for Annotation, Visualization and Integrated Discovery (DAVID), which was used to search for significantly enriched genes, and categorized them using Gene Ontology (GO) terms, and the second was the network explorer of Ingenuity Pathway Analysis (IPA), which was used to search for interaction networks among SHR- and SHRSP-specific genes. The IPA of SHR-specific genes revealed that prostaglandin E receptor 4 (Ptger4) is one of the candidate genes responsible for causing hypertension in SHR, and that albumin (Alb) and chymase 1 (Cma1) are also responsible for causing hypertension in SHR in the presence of angiotensinogen (Agt). Similar analyses of SHRSP-specific genes revealed that the angiotensin II receptor-associated gene (Agtrap) interacts with the FBJ osteosarcoma oncogene (Fos), and with the angiotensin II receptor type-1b (Agtr1b). As Agtrap and Agtr1b not only participate in the ‘uptake of norepinephrine’ and ‘blood pressure’, but also in the ‘behavior’ of SHRSP at 6 weeks of age, our data demonstrate a close association between hypertension and ADHD.

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