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Gadanec LK, Swiderski J, Apostolopoulos V, Kelaidonis K, Vidali VP, Canko A, Moore GJ, Matsoukas JM, Zulli A. Existence of Quantum Pharmacology in Sartans: Evidence in Isolated Rabbit Iliac Arteries. Int J Mol Sci 2023; 24:17559. [PMID: 38139391 PMCID: PMC10744031 DOI: 10.3390/ijms242417559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2023] [Revised: 12/09/2023] [Accepted: 12/14/2023] [Indexed: 12/24/2023] Open
Abstract
Quantum pharmacology introduces theoretical models to describe the possibility of ultra-high dilutions to produce biological effects, which may help to explain the placebo effect observed in hypertensive clinical trials. To determine this within physiology and to evaluate novel ARBs, we tested the ability of known angiotensin II receptor blockers (ARBs) (candesartan and telmisartan) used to treat hypertension and other cardiovascular diseases, as well as novel ARBs (benzimidazole-N-biphenyl tetrazole (ACC519T), benzimidazole-bis-N,N'-biphenyl tetrazole (ACC519T(2)) and 4-butyl-N,N0-bis[[20-2Htetrazol-5-yl)biphenyl-4-yl]methyl)imidazolium bromide (BV6(K+)2), and nirmatrelvir (the active ingredient in Paxlovid) to modulate vascular contraction in iliac rings from healthy male New Zealand White rabbits in responses to various vasopressors (angiotensin A, angiotensin II and phenylephrine). Additionally, the hemodynamic effect of ACC519T and telmisartan on mean arterial pressure in conscious rabbits was determined, while the ex vivo ability of BV6(K+)2 to activate angiotensin-converting enzyme-2 (ACE2) was also investigated. We show that commercially available and novel ARBs can modulate contraction responses at ultra-high dilutions to different vasopressors. ACC519T produced a dose-dependent reduction in rabbit mean arterial pressure while BV6(K+)2 significantly increased ACE2 metabolism. The ability of ARBs to inhibit contraction responses even at ultra-low concentrations provides evidence of the existence of quantum pharmacology. Furthermore, the ability of ACC519T and BV6(K+)2 to modulate blood pressure and ACE2 activity, respectively, indicates their therapeutic potential against hypertension.
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Affiliation(s)
- Laura Kate Gadanec
- Institute for Health and Sport, Victoria University, Melbourne, VIC 3030, Australia; (L.K.G.); (J.S.); (V.A.)
| | - Jordan Swiderski
- Institute for Health and Sport, Victoria University, Melbourne, VIC 3030, Australia; (L.K.G.); (J.S.); (V.A.)
| | - Vasso Apostolopoulos
- Institute for Health and Sport, Victoria University, Melbourne, VIC 3030, Australia; (L.K.G.); (J.S.); (V.A.)
- Immunology Program, Australian Institute for Musculoskeletal Science (AIMSS), Melbourne, VIC 3021, Australia
| | | | - Veroniki P. Vidali
- Institute of Nanoscience and Nanotechnology, National Centre for Scientific Research “Demokritos”, Ag. Paraskevi, 153 41 Athens, Greece; (V.P.V.); (A.C.)
| | - Aleksander Canko
- Institute of Nanoscience and Nanotechnology, National Centre for Scientific Research “Demokritos”, Ag. Paraskevi, 153 41 Athens, Greece; (V.P.V.); (A.C.)
| | - Graham J. Moore
- Pepmetics Inc., 772 Murphy Place, Victoria, BC V6Y 3H4, Canada;
- Department of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, Calgary, AB T2N 4N1, Canada
| | - John M. Matsoukas
- Institute for Health and Sport, Victoria University, Melbourne, VIC 3030, Australia; (L.K.G.); (J.S.); (V.A.)
- NewDrug PC, Patras Science Park, 26 504 Patras, Greece;
- Department of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, Calgary, AB T2N 4N1, Canada
- Department of Chemistry, University of Patras, 265 04 Patras, Greece
| | - Anthony Zulli
- Institute for Health and Sport, Victoria University, Melbourne, VIC 3030, Australia; (L.K.G.); (J.S.); (V.A.)
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Bernhem K, Krishnan K, Bondar A, Brismar H, Aperia A, Scott L. AT 1-receptor response to non-saturating Ang-II concentrations is amplified by calcium channel blockers. BMC Cardiovasc Disord 2017; 17:126. [PMID: 28514967 PMCID: PMC5436436 DOI: 10.1186/s12872-017-0562-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Accepted: 05/09/2017] [Indexed: 01/13/2023] Open
Abstract
BACKGROUND Blockers of angiotensin II type 1 receptor (AT1R) and the voltage gated calcium channel 1.2 (CaV1.2) are commonly used for treatment of hypertension. Yet there is little information about the effect of physiological concentrations of angiotensin II (AngII) on AT1R signaling and whether there is a reciprocal regulation of AT1R signaling by CaV1.2. METHODS To elucidate these questions, we have studied the Ca2+ signaling response to physiological and pharmacological AngII doses in HEK293a cells, vascular smooth muscle cells and cardiomyocytes using a Ca2+ sensitive dye as the principal sensor. Intra-cellular calcium recordings were performed in presence and absence of CaV1.2 blockers. Semi-quantitative imaging methods were used to assess the plasma membrane expression of AT1R and G-protein activation. RESULTS Repeated exposure to pharmacological (100 nM) concentrations of AngII caused, as expected, a down-regulation of the Ca2+ response. In contrast, repeated exposure to physiological (1 nM) AngII concentration resulted in an enhancement of the Ca2+ response. The up-regulation of the Ca2+ response to repeated 1 nM AngII doses and the down-regulation of the Ca2+ response to repeated 100 nM Angll doses were not accompanied by a parallel change of the AT1R plasma membrane expression. The Ca2+ response to 1 nM of AngII was amplified in the presence of therapeutic concentrations of the CaV1.2 blockers, nifedipine and verapamil, in vascular smooth muscle cells, cardiomyocytes and HEK293a cells. Amplification of the AT1R response was also observed following inhibition of the calcium permeable transient receptor potential cation channels, suggesting that the activity of AT1R is sensitive to calcium influx. CONCLUSIONS Our findings have implications for the understanding of hyperactivity of the angiotensin system and for use of Ca2+ channel blockers as mono-therapy in hypertension.
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Affiliation(s)
- Kristoffer Bernhem
- Science for Life Laboratory, Department of Applied Physics, Royal Institute of Technology, Stockholm, Sweden
| | - Kalaiselvan Krishnan
- Science for Life Laboratory, Department of Applied Physics, Royal Institute of Technology, Stockholm, Sweden
| | - Alexander Bondar
- Institute of Chemical Biology and Fundamental Medicine, 630090, Novosibirsk, Russia
| | - Hjalmar Brismar
- Science for Life Laboratory, Department of Women's and Children's Health, Karolinska Institutet, PO Box 1031, 17121, Solna, Sweden.,Science for Life Laboratory, Department of Applied Physics, Royal Institute of Technology, Stockholm, Sweden
| | - Anita Aperia
- Science for Life Laboratory, Department of Women's and Children's Health, Karolinska Institutet, PO Box 1031, 17121, Solna, Sweden.
| | - Lena Scott
- Science for Life Laboratory, Department of Women's and Children's Health, Karolinska Institutet, PO Box 1031, 17121, Solna, Sweden
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Ostasov P, Krusek J, Durchankova D, Svoboda P, Novotny J. Ca2+ responses to thyrotropin-releasing hormone and angiotensin II: the role of plasma membrane integrity and effect of G11alpha protein overexpression on homologous and heterologous desensitization. Cell Biochem Funct 2008; 26:264-74. [PMID: 18041110 DOI: 10.1002/cbf.1453] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The molecular mechanisms involved in GPCR-initiated signaling cascades where the two receptors share the same signaling cascade, such as thyrotropin-releasing hormone (TRH) and angiotensin II (ANG II), are still far from being understood. Here, we analyzed hormone-induced Ca(2+) responses and the process of desensitization in HEK-293 cells, which express endogenous ANG II receptors. These cells were transfected to express exogenously high levels of TRH receptors (clone E2) or both TRH receptors and G(11)alpha protein (clone E2M11). We observed that the characteristics of the Ca(2+) response, as well as the process of desensitization, were both strongly dependent on receptor number and G(11)alpha protein level. Whereas treatment of E2 cells with TRH or ANG II led to significant desensitization of the Ca(2+) response to subsequent addition of either hormone, the response was not desensitized in E2M11 cells expressing high levels of G(11)alpha. In addition, stimulation of both cell lines with THR elicited a clear heterologous desensitization to subsequent stimulation with ANG II. On the other hand, ANG II did not affect a subsequent response to TRH. ANG II-mediated signal transduction was strongly dependent on plasma membrane integrity modified by cholesterol depletion, but signaling through TRH receptors was altered only slightly under these conditions. It may be concluded that the level of expression of G-protein-coupled receptors and their cognate G-proteins strongly influences not only the magnitude of the Ca(2+) response but also the process of desensitization and resistance to subsequent hormone addition.
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Affiliation(s)
- Pavel Ostasov
- Institute of Physiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic
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Hus-Citharel A, Iturrioz X, Corvol P, Marchetti J, Llorens-Cortes C. Tyrosine kinase and mitogen-activated protein kinase/extracellularly regulated kinase differentially regulate intracellular calcium concentration responses to angiotensin II/III and bradykinin in rat cortical thick ascending limb. Endocrinology 2006; 147:451-63. [PMID: 16210376 DOI: 10.1210/en.2005-0253] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The cortical thick ascending limb (CTAL) coexpresses angiotensin (Ang) II/Ang III receptor type 1A (AT(1A)-R) and bradykinin (BK) receptor type 2 (B2-R). In several cell types, these two receptors share the same signaling pathways, although their physiological functions are often opposite. In CTAL, little is known about the intracellular transduction events leading to the final physiological response induced by these two peptides. We investigated and compared in this segment the action of Ang II/III and BK on intracellular calcium concentration ([Ca2+]i) response and metabolic CO2 production, an index of Na+ transport, by using inhibitors of protein kinase C (bisindolylmaleimide), Src tyrosine kinase (herbimycin A and PP2), and MAPK/ERK (PD98059 and UO126). Ang II/III and BK (10(-7) mol/liter) released Ca2+ from the same intracellular pools but activated different Ca2+ entry pathways. Ang II/III- or BK-induced [Ca2+]i increases were similarly potentiated by bisindolylmaleimide. Herbimycin A and PP2 decreased similarly the [Ca2+]i responses induced by Ang II/III and BK. In contrast, PD98059 and UO126 affected the effects of BK to a larger extent than those of Ang II/III. Especially, the Ca2+ influx induced by BK was more strongly inhibited than that induced by Ang II/III in the presence of both compounds. The Na+ transport was inhibited by BK and stimulated by Ang II/III. The inhibitory action of BK on Na+ transport was blocked by UO126, whereas the stimulatory response of Ang II/III was potentiated by UO126 but blocked by bisindolylmaleimide. These data suggest that the inhibitory effect of BK on Na+ transport seems to be directly mediated by an increase in Ca2+ influx dependent on MAPK/ERK pathway activation. In contrast, the stimulatory effect of Ang II/III on Na+ transport is more complex and involves PKC and MAPK/ERK pathways.
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Affiliation(s)
- Annette Hus-Citharel
- Institut National de la Santé et de la Recherche Médicale Unité 691, Collège de France, 75231 Paris Cedex 05, France
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Suárez C, Tornadú IG, Cristina C, Vela J, Iglesias AG, Libertun C, Díaz-Torga G, Becu-Villalobos D. Angiotensin and calcium signaling in the pituitary and hypothalamus. Cell Mol Neurobiol 2002; 22:315-33. [PMID: 12469873 DOI: 10.1023/a:1020772018703] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
1) In the rat pituitary, angiotensin type 1B receptors (AT1B) are located in lactotrophs and corticotrophs. 2) Activation of AT1B receptors are coupled to Gq/11 (Guanine protein coupled receptor, or GPCR); they increase phospholipase beta C (PLC) activity resulting in inositol 1,4,5 triphosphate (InsP3) and diacylglycerol (DAG) formation. A biphasic increase in [Ca2+]i triggered by InsP3 and DAG ensues. 3) As many GPCRs, AT1B pituitary receptors rapidly desensitize. 4) This was observed in the generation of InsP3, the mobilization of intracellular Ca(2+), and in prolactin release. Both homologous and heterologous desensitization was evidenced. 5) Desensitization of the angiotensin II type 1 (AT1) receptor in the pituitary shares similarities and differences with endogenously expressed or transfected AT1 receptors in different cell types. 6) In the pituitary hyperplasia generated by chronic estrogen treatment there was desensitization or alteration in angiotensin II (Ang II) evoked intracellular Ca2+ increase, InsP3 generation, and prolactin release. This correlates with a downregulation of AT1 receptors. 7) In particular, in hyperplastic cells Ang II failed to evoke a transient acute peak in [Ca2+]i, which was replaced by a persistent plateau phase of [Ca2+]i increase. 8) Different calcium channels participate in Ang II induced [Ca2+]i increase in control and hyperplastic cells. While spike phase in control cells is dependent on intracellular stores sensitive to thapsigargin, in hyperplastic cells plateau increase is dependent on extracellular calcium influx. 9) Signal transduction of the AT1 pituitary receptor is greatly modified by hyperplasia, and it may be an important mechanism in the control of the hyperplastic process. 10) In the hypothalamus and brain stem there is a predominant expression of AT1A and AT2 mRNA. 11) Ang II acts at specific receptors located on neurons in the hypothalamus and brain stem to elicit alterations in blood pressure, fluid intake, and hormone secretion. 12) Calcium channels play important roles in the Ang II induced behavioral and endocrine responses. 13) Ang II, in physiological concentrations, can activate AT1 receptors to stimulate both Ca2+ release from intracellular stores and Ca2+ influx from the extracellular space to increase [Ca2+]i in polygonal and stellate astroglia of the hypothalamus and brain stem. 14) In primary cell culture of neurons from newborn rat hypothalamus and brain stem, it has also been determined that Ang II elicits an AT1 receptor mediated inhibition of delayed rectifier K(+) current and a stimulation of Ca2+ current. 15) In primary cell cultures derived from the subfornical organ or the organum vasculosum laminae terminalis of newborn rat pups, Ang II produced a pronounced desensitization of the [Ca2+]i response. 16) Hypothalamic and pituitary Ang II systems are involved in different functions, some of which are related. At both levels Ang II signals through [Ca2+]i in a characteristic way.
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Affiliation(s)
- Cecilia Suárez
- Instituto de Biología y Medicina Experimental, CONICET, V. Obligado 2490, Buenos Aires, Argentina
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Hus-Citharel A, Marchetti J, Corvol P, Llorens-Cortes C. Potentiation of [Ca2+]i response to angiotensin III by cAMP in cortical thick ascending limb. Kidney Int 2002; 61:1996-2005. [PMID: 12028440 DOI: 10.1046/j.1523-1755.2002.00366.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND In the rat cortical thick ascending limb (CTAL), intracellular Ca2+ ([Ca2+]i) responses to angiotensin II (Ang II) and angiotensin III (Ang III) were mediated by the Ang II subtype 1A receptor (AT1A-R), whereas the arginine vasopressin (AVP)-dependent cAMP accumulation involved the vasopressin receptor type 2 (V2-R). This work was performed in CTAL to investigate the crosstalk between these two receptors by studying their transduction pathways. METHODS The cAMP-dependent pathway was activated by 10 minutes of prestimulation with either forskolin, CTP-cAMP or AVP, and Ang II/Ang III-induced [Ca2+]i responses were assessed. RESULTS Pretreatment with 5 micromol/L forskolin significantly enhanced the [Ca2+]i response induced by 10-7 mol/L either Ang II or Ang III. Analysis of dose-response curves to Ang III in forskolin-treated CTAL demonstrated that the maximal [Ca2+]i response was significantly increased without altering the EC50. In Ca2+-free medium, the forskolin-induced potentiation of the [Ca2+]i response to Ang III was weaker but always present, suggesting that this effect was not only due to intracellular Ca2+ release but also to extracellular Ca2+ influx. Furthermore, the fact that the forskolin-induced potentiation of the [Ca2+]i response to Ang III was blocked by 10 micromol/L H-89, a specific protein kinase A (PKA) inhibitor, indicated that this effect occurred via activation of PKA. Finally, the potentiation of the [Ca2+]i response to Ang III also was observed following pretreatment with 100 micromol/L CTP-cAMP or 10-7 mol/L AVP. CONCLUSIONS In CTAL, there is a positive crosstalk between the adenylyl cyclase and phosphoinositide pathways mediated by V2- and AT1A-R, respectively, through activation of PKA.
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