Affiliation:
1. From the Department of Pharmacology and Toxicology, Wright State University School of Medicine, Dayton, Ohio.
Abstract
The objective was to examine the effect of dehydration on the expression of the angiotensin type 1 (AT
1
) receptor subtype mRNAs in mice by using an in situ hybridization method. The method used free-floating brain sections with
35
S-labeled probes specific for the untranslated 5′ (AT
1a
) and 3′ (AT
1b
) regions. AT
1a
and AT
1b
mRNA levels in the subfornical organ (SFO) and anterior third ventricle (AV3V) were quantified by using a phosphor-imaging system. Emulsion autoradiography with cresyl violet counterstaining was used to show cellular expression. Adult male C57BL mice (25 to 30 g) were given water ad libitum or were deprived of water for 48 hours. Dehydration produced increases in plasma osmolality (349±6 versus 314±4 mOsm/kg) and hematocrit (58±2% versus 47±1%). In situ hybridization showed that there was expression of AT
1a
and of AT
1b
mRNA in SFO and AV3V. Dehydration produced an increase in AT
1a
mRNA in both regions, with no changes noted for AT
1b
. AT
1a
mRNA was increased in the AV3V region from 0.3±0.2 to 0.7±0.2 μCi/g and in the SFO from 0.6±0.3 to 1.0±0.2 μCi/g. These results provide information regarding the localization and physiological importance of a subset of angiotensin receptors that are important in volume and blood pressure regulation. AT
1a
and AT
1b
mRNAs showed a similar pattern of expression in rostral forebrain osmosensitive regions. However, osmotic/volume stimulation with dehydration produced specific activation of AT
1a
receptors. This verifies the role of AT
1a
receptors in volume regulation but raises a question concerning the physiological role of the AT
1b
subtype.
Publisher
Ovid Technologies (Wolters Kluwer Health)
Cited by
28 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
1. Behavioral economics and monetary wisdom: A cross‐level analysis of monetary aspiration, pay (dis)satisfaction, risk perception, and corruption in 32 nations;Business Ethics, the Environment & Responsibility;2023-03-21
2. A comparison of physiological and transcriptome responses to water deprivation and salt loading in the rat supraoptic nucleus;American Journal of Physiology-Regulatory, Integrative and Comparative Physiology;2015-04-01
3. Mechanisms of brain renin angiotensin system-induced drinking and blood pressure: importance of the subfornical organ;American Journal of Physiology-Regulatory, Integrative and Comparative Physiology;2015-02-15
4. Diverse Roles of Angiotensin Receptor Intracellular Signaling Pathways in the Control of Water and Salt Intake;Neurobiology of Body Fluid Homeostasis;2013-09-04
5. Immunohistochemical Localization ofAT1a,AT1b, andAT2Angiotensin II Receptor Subtypes in the Rat Adrenal, Pituitary, and Brain with a Perspective Commentary;International Journal of Hypertension;2013