It’s Renin in the Brain
2002; Lippincott Williams & Wilkins; Volume: 90; Issue: 1 Linguagem: Inglês
10.1161/res.90.1.8
ISSN1524-4571
Autores Tópico(s)Hormonal Regulation and Hypertension
ResumoHomeCirculation ResearchVol. 90, No. 1It's Renin in the Brain Free AccessEditorialPDF/EPUBAboutView PDFView EPUBSections ToolsAdd to favoritesDownload citationsTrack citationsPermissions ShareShare onFacebookTwitterLinked InMendeleyReddit Jump toFree AccessEditorialPDF/EPUBIt's Renin in the BrainTransgenic Animals Elucidate the Brain Renin-Angiotensin System Michael Bader and Detlev Ganten Michael BaderMichael Bader From the Max-Delbrück-Center for Molecular Medicine (M.B., D.G.), Berlin-Buch, Germany; and the Department of Clinical Pharmacology (D.G.), University Hospital Benjamin Franklin, Free University, Berlin, Germany. and Detlev GantenDetlev Ganten From the Max-Delbrück-Center for Molecular Medicine (M.B., D.G.), Berlin-Buch, Germany; and the Department of Clinical Pharmacology (D.G.), University Hospital Benjamin Franklin, Free University, Berlin, Germany. Originally published3 Apr 2018https://doi.org/10.1161/res.90.1.8Circulation Research. 2002;90:8–10Since the first description of renin, angiotensinogen and angiotensin as well as converting enzyme and angiotensin receptors in the brain exactly 30 years ago,1–5 there was a heated debate, whether an endogenous intrinsic brain renin- angiotensin system (RAS) exists or not.6,7 For a long time, the "believers" of local angiotensin II generation by the brain RAS were in a minority. Even at a symposium 1981, celebrating the 10-year anniversary of the discovery of the brain RAS, there was skepticism and the question whether the "renin-like" enzyme in brain was identical with cathepsins, tonin, or other proteases was a matter of debate. Historically, it is interesting that the presence in the brain of other classically peripheral peptides such as insulin, glucagon, and substance P was accepted without identification of the local synthetic pathway and less controversial than angiotensin as neuropeptide. Open letters, public debates, and personal accusations nourished sometimes emotional controversy whether angiotensin could be generated locally in tissue. The brain was a model for angiotensin generating pathways in other extrarenal tissues because the blood-brain barrier, which is impermeable for proteins and peptides, made it more unlikely that the RAS components measured in the brain were contaminations from the plasma.Angiotensin has extremely powerful effects on the brain that synergistically increase blood volume and blood pressure, eg, by stimulation of water intake and salt appetite, release of various pituitary hormones, increase of sympathetic tone, and decrease of baroreceptor reflex.7 The local generation of angiotensin II in the brain by an endogenous intrinsic RAS could therefore be extremely important for cardiovascular control and beyond.With the advent of transgenic technology, novel approaches to study the mechanistic and functional aspects of the brain RAS became available. Renin and angiotensinogen could be overexpressed or ablated in experimental paradigms.In this issue of Circulation Research, the group of Curt Sigmund8 analyzes a novel transgenic mouse model that overexpresses human renin driven by 75 kb of its own regulatory sequences. The expression of the transgene mimics the normal tissue-specificity and regulation of human renin in the periphery, albeit on a higher level due to multiple copies inserted in the genome.9 The animals are therefore valid models to study the distribution of renin in the brain. By immunocytochemistry, the authors show that human renin can be found in glial cells of the amygdala, cortex, thalamus, and hypothalamus, as well as in neurons of the dorsal cochlear nucleus and the hippocampus.8This and other studies show that the brain mainly synthesizes a novel renin isoform encoded by an mRNA with an alternative first exon.8,10–13 The transcription of this isoform in humans starts far upstream of the previously described initiation site. A recent report supposed the novel exon 1A to be situated 1.3 kb upstream based on a partial sequence homology.13 However, a search in the Human Genome Database detects a 100% homologous sequence 6.2 kb 5′ of the canonical start site (own unpublished results). Moreover, there is no evidence that transcription really starts there and the promoter may map even further upstream. Thus, the structure and function of the new renin isoform is not yet understood, but it may be involved in intracellular angiotensin generation probably inside mitochondria.10The analysis of transgenic animals overexpressing human angiotensinogen provided evidence against a role of alternative pathways in physiologically relevant angiotensin generation.14–16 Because human angiotensinogen can not be cleaved by rodent renin, all these animal models remained without cardiovascular phenotype. Only when they were crossbred with animals carrying human renin transgenes, strong blood pressure effects were observed.15–17 It is unlikely, however still untested, that this species specificity also occurs for other angiotensin-generating enzymes. Thus, should an alternative metabolism of the human substrate by an enzyme other than renin exist in the rodent brain the animals should have become hypertensive even in the absence of human renin.Functional Importance of the Brain Renin-Angiotensin SystemIn addition to the biosynthetic pathways, transgenic models also contributed to the study of the functional importance of angiotensin in the brain. Transgenic mice with overexpression of the human RAS in several tissues15 or in the brain alone18 become hypertensive, also the ones described in this issue.8 In these models, the high blood pressure can be reduced by intracerebroventricular injection of the angiotensin II receptor AT1 antagonist losartan, suggesting that brain renin is a major determinant of hypertension. Part of the effect seems to be mediated by vasopressin because intravenous injection of a V1 receptor antagonist also attenuates the hypertensive phenotype. In contrast, ganglion blockade has no specific effect, indicating that the sympathetic nervous system is not primarily involved in this central angiotensin action.Very recently, a transgenic mouse was presented with 8 times more angiotensin II in the brain but normal levels in the circulation.19 The peptide is liberated during secretion from an artificial chimeric protein expressed under the control of the brain-specific glial fibrillary acidic protein (GFAP) promoter. Also these animals are hypertensive.The hypertension developed by transgenic rats carrying the mouse renin gene Ren-2, TGR(mREN2)27,20 is also partially dependent on the expression of the transgene in the brain. These animals generate up to tenfold more angiotensin II in the central nervous system than control rats.21 When they are anesthetized by chloralose-urethane, blood pressure drops to normal, arguing in favor of a neurogenic cause of their hypertension.22 Furthermore, when the central angiotensin generation in TGR(mREN2)27 is blunted by crossbreeding with transgenic rats carrying a brain-specific deficiency in angiotensinogen [TGR(ASrAOGEN)], a significant reduction in blood pressure is observed.23The already mentioned transgenic rat model, TGR(ASrAOGEN), has provided numerous insights in the functionality of the brain RAS. These rats carry a transgene expressing an antisense RNA against angiotensinogen specifically in the brain under the control of the GFAP promoter.23 This causes a reduction of local angiotensinogen levels by 90% without affecting the circulating RAS. The rats are hypotensive and exhibit reduced vasopressin levels in the circulation, again supporting a central involvement of angiotensin II in vasopressin secretion. Furthermore, they show an increased baroreflex sensitivity due to an imbalance of the parasympathetic and sympathetic nervous system.24 Together with the findings that TGR(mREN2)2725 and mice expressing the human RAS26 exhibit a decreased baroreflex sensitivity, these data characterize central angiotensin as relevant moderator of the baroreflex.Central angiotensin is also importantly involved in cardiovascular rhythm control. Renin overexpression in TGR(mREN2)2727as well as low-dose peripheral infusions of angiotensin II in normal rats28 cause an inversion of the circadian blood pressure rhythm. This effect of increased peripheral angiotensin II is absent in TGR(ASrAOGEN).28 Thus, peripheral angiotensin II needs central angiotensin II as mediator of the rhythm shift. Melatonin is a candidate downstream effector of central angiotensin in this respect because its synthesis is attenuated in TGR(ASrAOGEN).29 Because only the rhythm of blood pressure but not of heart rate is altered by angiotensin II, the peptide seems to affect not the main oscillator in the suprachiasmatic nucleus but its output pathways or its synchronization with peripheral oscillators in cardiovascular organs.In contrast to the cardiovascular actions of central angiotensin II, its role in thirst and drinking is controversial. Using knockout mice for both subtypes of the AT1 receptor, Davisson et al30 have shown that the drinking response to intracerebroventricularly injected angiotensin II depends on AT1B, whereas blood pressure is increased by AT1A receptors. TGR(ASrAOGEN), in which the expression of AT1 receptors is increased in the brain, the drinking response to injected angiotensin II is also augmented.31 However, mice with a permanent increase in brain angiotensin by a local activation of the human RAS or liberation from a chimeric protein18,19 show normal water intake. Thus, sudden elevation of central angiotensin II levels induces thirst but long-term overproduction may be compensated by other mechanisms regulating drinking behavior.Although the drinking of water is unaffected by a permanent increase in brain angiotensin II, alcohol drinking is. Mice overexpressing rat angiotensinogen drink more and angiotensinogen knockout mice drink less alcohol than their respective controls in a free-choice paradigm.32 First evidence indicates that a modulation of dopamine release by angiotensin may mediate this effect.Taken together, the study by Morimoto et al8 showing that human renin is expressed in brain areas relevant for cardiovascular and fluid homeostasis supports that it is a major angiotensin-generating enzyme in the brain. Furthermore, the increase of renin levels in this organ by targeted overexpression in transgenic animals causes hypertension by the local generation of angiotensin II. A contribution of other enzymes to central angiotensin generation can still not be completely ruled out, but the findings presented here allow us to sing, modified from Gene Kelly, "It's renin in the brain!"The opinions expressed in this editorial are not necessarily those of the editors or of the American Heart Association.FootnotesCorrespondence to Prof Dr Detlev Ganten, Max-Delbrück-Center for Molecular Medicine (MDC), Robert-Rössle-Str 10, D-13092 Berlin-Buch, Germany. E-mail [email protected] References 1 Ganten D, Minnich JL, Granger P, Hayduk K, Brecht HM, Barbeau A, Boucher R, Genest J. Angiotensin-forming enzyme in brain tissue. Science. 1971; 173: 64–65.CrossrefMedlineGoogle Scholar2 Fischer-Ferraro C, Nahmod VE, Goldstein DJ, Finkielman S. Angiotensin and renin in rat and dog brain. J Exp Med. 1971; 133: 353–361.CrossrefMedlineGoogle Scholar3 Ganten D, Marquez-Julio A, Granger O, Hayduk K, Karsunky KP, Boucher R, Genest J. Renin in dog brain. 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Blood pressure reduction and diabetes insipidus in transgenic rats deficient in brain angiotensinogen. Proc Natl Acad Sci USA. 1999; 96: 3975–3980.CrossrefMedlineGoogle Scholar24 Baltatu O, Janssen BJ, Bricca G, Plehm R, Monti J, Ganten D, Bader M. Alterations in blood pressure and heart rate variability in transgenic rats with low brain angiotensinogen. Hypertension. 2001; 37: 408–413.CrossrefMedlineGoogle Scholar25 Borgonio A, Pummer S, Witte K, Lemmer B. Reduced baroreflex sensitivity and blunted endogenous nitric oxide synthesis precede the development of hypertension in TGR(mREN2)27 rats. Chronobiol Int. 2001; 18: 215–226.CrossrefMedlineGoogle Scholar26 Davisson RL, Yang G, Beltz TG, Cassell MD, Johnson AK, Sigmund CD. The brain renin-angiotensin system contributes to the hypertension in mice containing both the human renin and human angiotensinogen transgenes. Circ Res. 1998; 83: 1047–1058.CrossrefMedlineGoogle Scholar27 Lemmer B, Mattes A, Böhm M, Ganten D. 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January 11, 2002Vol 90, Issue 1 Advertisement Article InformationMetrics https://doi.org/10.1161/res.90.1.8PMID: 11786510 Originally publishedApril 3, 2018 Keywordsbraintransgenic animalsrenin-angiotensin systemcentral mechanismsPDF download Advertisement
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