1
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Han YS, Bandi R, Fogarty MJ, Sieck GC, Brozovich FV. Aging related decreases in NM myosin expression and contractility in a resistance vessel. Front Physiol 2024; 15:1411420. [PMID: 38808359 PMCID: PMC11130448 DOI: 10.3389/fphys.2024.1411420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2024] [Accepted: 05/01/2024] [Indexed: 05/30/2024] Open
Abstract
Introduction: Vasodilatation in response to NO is a fundamental response of the vasculature, and during aging, the vasculature is characterized by an increase in stiffness and decrease in sensitivity to NO mediated vasodilatation. Vascular tone is regulated by the activation of smooth muscle and nonmuscle (NM) myosin, which are regulated by the activities of myosin light chain kinase (MLCK) and MLC phosphatase. MLC phosphatase is a trimeric enzyme with a catalytic subunit, myosin targeting subunit (MYPT1) and 20 kDa subunit of unknown function. Alternative mRNA splicing produces LZ+/LZ- MYPT1 isoforms and the relative expression of LZ+/LZ- MYPT1 determines the sensitivity to NO mediated vasodilatation. This study tested the hypothesis that aging is associated with changes in LZ+ MYPT1 and NM myosin expression, which alter vascular reactivity. Methods: We determined MYPT1 and NM myosin expression, force and the sensitivity of both endothelial dependent and endothelial independent relaxation in tertiary mesenteric arteries of young (6mo) and elderly (24mo) Fischer344 rats. Results: The data demonstrate that aging is associated with a decrease in both the expression of NM myosin and force, but LZ+ MYPT expression and the sensitivity to both endothelial dependent and independent vasodilatation did not change. Further, smooth muscle cell hypertrophy increases the thickness of the medial layer of smooth muscle with aging. Discussion: The reduction of NM myosin may represent an aging associated compensatory mechanism to normalize the stiffness of resistance vessels in response to the increase in media thickness observed during aging.
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Affiliation(s)
- Young Soo Han
- Departments of Physiology and Biomedical Engineering and Cardiovascular Diseases, Mayo Clinic, Rochester, MN, United States
| | - Rishiraj Bandi
- Departments of Physiology and Biomedical Engineering and Cardiovascular Diseases, Mayo Clinic, Rochester, MN, United States
| | - Matthew J Fogarty
- Departments of Physiology and Biomedical Engineering and Cardiovascular Diseases, Mayo Clinic, Rochester, MN, United States
| | - Gary C Sieck
- Departments of Physiology and Biomedical Engineering and Cardiovascular Diseases, Mayo Clinic, Rochester, MN, United States
| | - Frank V Brozovich
- Departments of Physiology and Biomedical Engineering and Cardiovascular Diseases, Mayo Clinic, Rochester, MN, United States
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2
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Tan H, Zhou H, Chen J, Ren H, Guo Y, Jiang X. Association of early life adversity with cardiovascular disease and its potential mechanisms: a narrative review. Front Public Health 2024; 12:1341266. [PMID: 38362223 PMCID: PMC10867864 DOI: 10.3389/fpubh.2024.1341266] [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: 11/20/2023] [Accepted: 01/15/2024] [Indexed: 02/17/2024] Open
Abstract
Strong epidemiological evidence has shown that early life adversity (ELA) has a profound negative impact on health in adulthood, including an increased risk of cardiovascular disease, the leading cause of death worldwide. Here, we review cohort studies on the effects of ELA on cardiovascular outcomes and the possible underlying mechanisms. In addition, we summarize relevant studies in rodent models of ELA. This review reveals that the prevalence of ELA varies between regions, time periods, and sexes. ELA increases cardiovascular health risk behaviors, susceptibility to mental illnesses, and neuroendocrine and immune system dysfunction in humans. Rodent models of ELA have been developed and show similar cardiovascular outcomes to those in humans but cannot fully replicate all ELA subtypes. Therefore, combining cohort and rodent studies to further investigate the mechanisms underlying the association between ELA and cardiovascular diseases may be a feasible future research strategy.
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Affiliation(s)
- Huiying Tan
- Department of Geriatrics, The Second Clinical Medical College, Jinan University (Shenzhen People’s Hospital), Shenzhen, China
- The First Affiliated Hospital, Jinan University, Guangzhou, China
| | - Huiting Zhou
- Department of Geriatrics, The Second Clinical Medical College, Jinan University (Shenzhen People’s Hospital), Shenzhen, China
| | - Jingmei Chen
- Department of Geriatrics, The Second Clinical Medical College, Jinan University (Shenzhen People’s Hospital), Shenzhen, China
| | - Huixia Ren
- Department of Geriatrics, The Second Clinical Medical College, Jinan University (Shenzhen People’s Hospital), Shenzhen, China
| | - Yi Guo
- Department of Neurology, The Second Clinical Medical College, Jinan University (Shenzhen People’s Hospital), Shenzhen, China
| | - Xin Jiang
- Department of Geriatrics, The Second Clinical Medical College, Jinan University (Shenzhen People’s Hospital), Shenzhen, China
- Shenzhen Clinical Research Center for Geriatrics, Shenzhen People’s Hospital, Shenzhen, China
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3
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Costa TJ, De Oliveira JC, Giachini FR, Lima VV, Tostes RC, Bomfim GF. Programming of Vascular Dysfunction by Maternal Stress: Immune System Implications. Front Physiol 2022; 13:787617. [PMID: 35360231 PMCID: PMC8961444 DOI: 10.3389/fphys.2022.787617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Accepted: 01/13/2022] [Indexed: 11/13/2022] Open
Abstract
A growing body of evidence highlights that several insults during pregnancy impact the vascular function and immune response of the male and female offspring. Overactivation of the immune system negatively influences cardiovascular function and contributes to cardiovascular disease. In this review, we propose that modulation of the immune system is a potential link between prenatal stress and offspring vascular dysfunction. Glucocorticoids are key mediators of stress and modulate the inflammatory response. The potential mechanisms whereby prenatal stress negatively impacts vascular function in the offspring, including poor hypothalamic–pituitary–adrenal axis regulation of inflammatory response, activation of Th17 cells, renin–angiotensin–aldosterone system hyperactivation, reactive oxygen species imbalance, generation of neoantigens and TLR4 activation, are discussed. Alterations in the immune system by maternal stress during pregnancy have broad relevance for vascular dysfunction and immune-mediated diseases, such as cardiovascular disease.
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Affiliation(s)
- Tiago J. Costa
- Department of Pharmacology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil
| | - Júlio Cezar De Oliveira
- Health Education Research Center (NUPADS), Institute of Health Sciences, Federal University of Mato Grosso, Sinop, Brazil
| | - Fernanda Regina Giachini
- Institute of Biological Sciences and Health, Federal University of Mato Grosso, Barra do Garças, Brazil
| | - Victor Vitorino Lima
- Institute of Biological Sciences and Health, Federal University of Mato Grosso, Barra do Garças, Brazil
| | - Rita C. Tostes
- Health Education Research Center (NUPADS), Institute of Health Sciences, Federal University of Mato Grosso, Sinop, Brazil
| | - Gisele Facholi Bomfim
- Health Education Research Center (NUPADS), Institute of Health Sciences, Federal University of Mato Grosso, Sinop, Brazil
- *Correspondence: Gisele Facholi Bomfim,
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4
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Burrage EN, Aboaziza E, Hare L, Reppert S, Moore J, Goldsmith WT, Kelley EE, Mills A, Dakhlallah D, Chantler PD, Olfert IM. Long-term cerebrovascular dysfunction in the offspring from maternal electronic cigarette use during pregnancy. Am J Physiol Heart Circ Physiol 2021; 321:H339-H352. [PMID: 34170194 DOI: 10.1152/ajpheart.00206.2021] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Electronic cigarettes (E-cigs) have been promoted as harm-free or less risky than smoking, even for women during pregnancy. These claims are made largely on E-cig aerosol having fewer number of toxic chemicals compared with cigarette smoke. Given that even low levels of smoking are found to produce adverse birth outcomes, we sought to test the hypothesis that vaping during pregnancy (with or without nicotine) would not be harm-free and would result in vascular dysfunction that would be evident in offspring during adolescent and/or adult life. Pregnant female Sprague Dawley rats were exposed to E-cig aerosol (1 h/day, 5 days/wk, starting on gestational day 2 until pups were weaned) using e-liquid with 0 mg/mL (E-cig0) or 18 mg/mL nicotine (E-cig18) and compared with ambient air-exposed controls. Body mass at birth and at weaning were not different between groups. Assessment of middle cerebral artery (MCA) reactivity revealed a 51%-56% reduction in endothelial-dependent dilation response to acetylcholine (ACh) for both E-cig0 and E-cig18 in 1-mo, 3-mo (adolescent), and 7-mo-old (adult) offspring (P < 0.05 compared with air, all time points). MCA responses to sodium nitroprusside (SNP) and myogenic tone were not different across groups, suggesting that endothelial-independent responses were not altered. The MCA vasoconstrictor response (5-hydroxytryptamine, 5-HT) was also not different across treatment and age groups. These data demonstrate that maternal vaping during pregnancy is not harm-free and confers significant cerebrovascular health risk/dysfunction to offspring that persists into adult life. NEW & NOTEWORTHY These data established that vaping electronic cigarettes during pregnancy, with or without nicotine, is not safe and confers significant risk potential to the cerebrovascular health of offspring in early and adult life. A key finding is that vaping without nicotine does not protect offspring from cerebrovascular dysfunction and results in the same level of cerebrovascular dysfunction (compared with maternal vaping with nicotine), indicating that the physical and/or chemical properties from the base solution (other than nicotine) are responsible for the cerebrovascular dysfunction that we observed. Listen to this article's corresponding podcast at https://ajpheart.podbean.com/e/maternal-vaping-impairs-vascular-function-in-theoffspring/.
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Affiliation(s)
- E N Burrage
- West Virginia University School of Medicine, West Virginia University, Morgantown, West Virginia.,Department of Neuroscience, West Virginia University, Morgantown, West Virginia
| | - E Aboaziza
- West Virginia University School of Medicine, West Virginia University, Morgantown, West Virginia.,West Virginia Clinical and Translational Science Institute, West Virginia University, Morgantown, West Virginia
| | - L Hare
- West Virginia University School of Medicine, West Virginia University, Morgantown, West Virginia.,Division of Exercise Physiology, West Virginia University, Morgantown, West Virginia
| | - S Reppert
- West Virginia University School of Medicine, West Virginia University, Morgantown, West Virginia.,Division of Exercise Physiology, West Virginia University, Morgantown, West Virginia
| | - J Moore
- West Virginia University School of Medicine, West Virginia University, Morgantown, West Virginia
| | - W T Goldsmith
- Center for Inhalation Toxicology, West Virginia University, Morgantown, West Virginia.,Department of Physiology and Pharmacology, West Virginia University, Morgantown, West Virginia
| | - E E Kelley
- Department of Physiology and Pharmacology, West Virginia University, Morgantown, West Virginia
| | - A Mills
- Department of Physiology and Pharmacology, West Virginia University, Morgantown, West Virginia
| | - D Dakhlallah
- Department of Microbiology, Immunology and Cell Biology, West Virginia University, Morgantown, West Virginia
| | - P D Chantler
- West Virginia University School of Medicine, West Virginia University, Morgantown, West Virginia.,Department of Neuroscience, West Virginia University, Morgantown, West Virginia.,West Virginia Clinical and Translational Science Institute, West Virginia University, Morgantown, West Virginia.,Division of Exercise Physiology, West Virginia University, Morgantown, West Virginia
| | - I M Olfert
- West Virginia University School of Medicine, West Virginia University, Morgantown, West Virginia.,West Virginia Clinical and Translational Science Institute, West Virginia University, Morgantown, West Virginia.,Division of Exercise Physiology, West Virginia University, Morgantown, West Virginia.,Center for Inhalation Toxicology, West Virginia University, Morgantown, West Virginia.,Department of Physiology and Pharmacology, West Virginia University, Morgantown, West Virginia
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5
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Htet M, Ursitti JA, Chen L, Fisher SA. Editing of the myosin phosphatase regulatory subunit suppresses angiotensin II induced hypertension via sensitization to nitric oxide mediated vasodilation. Pflugers Arch 2021; 473:611-622. [PMID: 33145641 DOI: 10.1007/s00424-020-02488-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Revised: 10/27/2020] [Accepted: 10/30/2020] [Indexed: 10/23/2022]
Abstract
Alternative splicing of exon 24 (E24) of the myosin phosphatase regulatory subunit (Mypt1) tunes smooth muscle sensitivity to NO/cGMP-mediated vasorelaxation and thereby controls blood pressure (BP) in otherwise normal mice. This occurs via the toggling in or out of a C-terminal leucine zipper (LZ) motif required for hetero-dimerization with and activation by cGMP-dependent protein kinase cGK1α. Here we tested the hypothesis that editing (deletion) of E24, by shifting to the LZ positive isoform of Mypt1, would suppress the hypertensive response to angiotensin II (AngII). To test this, mice underwent tamoxifen-inducible and smooth muscle-specific deletion of E24 (E24 cKO) at age 6 weeks followed by a chronic slow-pressor dose of AngII (400 ng/kg/min) plus additional stressors. E24 cKO suppressed the hypertensive response to AngII alone or with the addition of a high salt diet. This effect was not a function of altered salt balance as there were no differences in intake or renal excretion of sodium. This effect was NO dependent as L-NAME in the drinking water caused an exaggerated hypertensive response in the E24cKO mice. E24cKO mouse mesenteric arteries were more sensitive to DEA/NO-induced vasorelaxation and less responsive to AngII- and α-adrenergic-induced vasoconstriction at baseline. Only the latter two effects were still present after 2 weeks of chronic AngII treatment. We conclude that editing of Mypt1 E24, by shifting the expression of naturally occurring isoforms and sensitizing to NO-mediated vasodilation, could be a novel approach to the treatment of human hypertension.
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Affiliation(s)
- Myo Htet
- Department of Medicine (Cardiology) and Physiology and Biophysics, University of Maryland-Baltimore, Baltimore, MD, 21201, USA
| | - Jeanine A Ursitti
- Department of Medicine (Cardiology) and Physiology and Biophysics, University of Maryland-Baltimore, Baltimore, MD, 21201, USA
| | - Ling Chen
- Department of Medicine (Cardiology) and Physiology and Biophysics, University of Maryland-Baltimore, Baltimore, MD, 21201, USA
- Department of Physiology , University of Maryland- Baltimore , MD, 21201, Baltimore, USA
| | - Steven A Fisher
- Department of Medicine (Cardiology) and Physiology and Biophysics, University of Maryland-Baltimore, Baltimore, MD, 21201, USA.
- Department of Medicine, Division of Cardiovascular Medicine, University of Maryland-Baltimore, Baltimore, MD, 21201, USA.
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6
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Maternal Separation Induces Long-Term Alterations in the Cardiac Oxytocin Receptor and Cystathionine γ-Lyase Expression in Mice. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2020; 2020:4309605. [PMID: 32082478 PMCID: PMC7007946 DOI: 10.1155/2020/4309605] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 12/13/2019] [Accepted: 12/28/2019] [Indexed: 12/21/2022]
Abstract
We recently showed that blunt chest trauma reduced the expression of the myocardial oxytocin receptor (Oxtr), which was further aggravated by genetic deletion of the H2S-producing enzyme cystathionine γ-lyase (CSE). Exogenous H2S supplementation restored myocardial Oxtr expression under these conditions. Early life stress (ELS) is a risk factor for cardiovascular disease by affecting vascular and heart structures. Therefore, we tested the hypotheses that (i) ELS affects cardiac Oxtr and CSE expressions and (ii) Oxtr and CSE expression patterns depend on the duration of stress exposure. Thus, two stress paradigms were compared: long- and short-term separation stress (LTSS and STSS, respectively). Cardiac Oxtr expression was differentially affected by the two stress paradigms with a significant reduction after LTSS and a significant increase after STSS. CSE expression, which was significantly reduced in Oxtr−/− knockout hearts, was downregulated and directly related to Oxtr expression in LTSS hearts (r = 0.657, p = 0.012). In contrast, CSE expression was not related to Oxtr upregulation in STSS. Plasma Oxt levels were not affected by either ELS paradigm. The coincidence of LTSS-induced reduction of cardiac Oxtr and reduced CSE expression may suggest a novel pathophysiological link between early life adversities and increased risk for the development of cardiovascular disorders in adulthood.
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7
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Obi IE, McPherson KC, Pollock JS. Childhood adversity and mechanistic links to hypertension risk in adulthood. Br J Pharmacol 2019; 176:1932-1950. [PMID: 30656638 PMCID: PMC6534788 DOI: 10.1111/bph.14576] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2018] [Revised: 10/17/2018] [Accepted: 10/29/2018] [Indexed: 02/07/2023] Open
Abstract
Adverse childhood experiences (ACEs), defined as traumatic events in childhood that range from various forms of abuse to household challenges and dysfunction, have devastating consequences on adult health. Epidemiological studies in humans and animal models of early life stress (ELS) have revealed a strong association and insight into the mechanistic link between ACEs and increased risk of cardiovascular disease (CVD). This review focuses on the mechanistic links of ACEs in humans and ELS in mice and rats to vasoactive factors and immune mediators associated with CVD and hypertension risk, as well as sex differences in these phenomena. Major topics of discussion in this review are as follows: (a) epidemiological associations between ACEs and CVD risk focusing on hypertension, (b) evidence for association of ACE exposures to immune-mediated and/or vasoactive pathways, (c) rodent models of ELS-induced hypertension risk, (d) proinflammatory mediators and vasoactive factors as mechanisms of ELS-induced hypertension risk. We also provide some overall conclusions and directions of further research. LINKED ARTICLES: This article is part of a themed section on Immune Targets in Hypertension. To view the other articles in this section visit http://onlinelibrary.wiley.com/doi/10.1111/bph.v176.12/issuetoc.
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Affiliation(s)
- Ijeoma E. Obi
- CardioRenal Physiology and Medicine Section, Division of Nephrology, Department of MedicineUniversity of Alabama at BirminghamBirminghamAlabamaUnited States
| | - Kasi C. McPherson
- CardioRenal Physiology and Medicine Section, Division of Nephrology, Department of MedicineUniversity of Alabama at BirminghamBirminghamAlabamaUnited States
| | - Jennifer S. Pollock
- CardioRenal Physiology and Medicine Section, Division of Nephrology, Department of MedicineUniversity of Alabama at BirminghamBirminghamAlabamaUnited States
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8
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Loria AS, Spradley FT, Obi IE, Becker BK, De Miguel C, Speed JS, Pollock DM, Pollock JS. Maternal separation enhances anticontractile perivascular adipose tissue function in male rats on a high-fat diet. Am J Physiol Regul Integr Comp Physiol 2018; 315:R1085-R1095. [PMID: 30256681 DOI: 10.1152/ajpregu.00197.2018] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Clinical studies have shown that obesity negatively impacts large arteries' function. We reported that rats exposed to maternal separation (MatSep), a model of early life stress, display enhanced angiotensin II (ANG II)-induced vasoconstriction in aortic rings cleaned of perivascular adipose tissue (PVAT) under normal diet (ND) conditions. We hypothesized that exposure to MatSep promotes a greater loss of PVAT-mediated protective effects on vascular function and loss of blood pressure (BP) rhythm in rats fed a high-fat diet (HFD) when compared with controls. MatSep was performed in male Wistar-Kyoto rats from days 2 to 14 of life. Normally reared littermates served as controls. On ND, aortic rings from MatSep rats with PVAT removed showed increased ANG II-mediated vasoconstriction versus controls; however, rings from MatSep rats with intact PVAT displayed blunted constriction. This effect was exacerbated by an HFD in both groups; however, the anticontractile effect of PVAT was greater in MatSep rats. Acetylcholine-induced relaxation was similar in MatSep and control rats fed an ND, regardless of the presence of PVAT. HFD impaired aortic relaxation in rings without PVAT from MatSep rats, whereas the presence of PVAT improved relaxation in both groups. On an HFD, immunolocalization of vascular smooth muscle-derived ANG-(1-7) and PVAT-derived adiponectin abundances were increased in MatSep. In rats fed an HFD, 24-h BP and BP rhythms were similar between groups. In summary, MatSep enhanced the ability of PVAT to blunt the heightened ANG II-induced vasoconstriction and endothelial dysfunction in rats fed an HFD. This protective effect may be mediated via the upregulation of vasoprotective factors within the adipovascular axis.
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Affiliation(s)
- Analia S Loria
- Department of Pharmacology and Nutritional Sciences, University of Kentucky , Lexington, Kentucky
| | - Frank T Spradley
- Department of Surgery, University of Mississippi Medical Center , Jackson, Mississippi
| | - Ijeoma E Obi
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham , Birmingham, Alabama
| | - Bryan K Becker
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham , Birmingham, Alabama
| | - Carmen De Miguel
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham , Birmingham, Alabama
| | - Joshua S Speed
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham , Birmingham, Alabama
| | - David M Pollock
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham , Birmingham, Alabama.,Department of Medicine, Medical College of Georgia, Augusta University, Augusta, Georgia
| | - Jennifer S Pollock
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham , Birmingham, Alabama.,Department of Medicine, Medical College of Georgia, Augusta University, Augusta, Georgia
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9
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Smooth Muscle Phenotypic Diversity: Effect on Vascular Function and Drug Responses. ADVANCES IN PHARMACOLOGY 2017. [PMID: 28212802 DOI: 10.1016/bs.apha.2016.07.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2023]
Abstract
At its simplest resistance to blood flow is regulated by changes in the state of contraction of the vascular smooth muscle (VSM), a function of the competing activities of the myosin kinase and phosphatase determining the phosphorylation and activity of the myosin ATPase motor protein. In contrast, the vascular system of humans and other mammals is incredibly complex and highly regulated. Much of this complexity derives from phenotypic diversity within the smooth muscle, reflected in very differing power outputs and responses to signaling pathways that regulate vessel tone, presumably having evolved over the millennia to optimize vascular function and its control. The highly regulated nature of VSM tone, described as pharmacomechanical coupling, likely underlies the many classes of drugs in clinical use to alter vascular tone through activation or inhibition of these signaling pathways. This review will first describe the phenotypic diversity within VSM, followed by presentation of specific examples of how molecular diversity in signaling, myofilament, and calcium cycling proteins impacts arterial smooth muscle function and drug responses.
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10
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Effects of Neonatal Methamphetamine and Stress on Brain Monoamines and Corticosterone in Preweanling Rats. Neurotox Res 2016; 31:269-282. [PMID: 27817108 DOI: 10.1007/s12640-016-9680-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Revised: 10/17/2016] [Accepted: 10/20/2016] [Indexed: 01/10/2023]
Abstract
Neonatal exposure to methamphetamine (MA) and developmental chronic stress significantly alter neurodevelopmental profiles that show a variety of long-term physiological and behavioral effects. In the current experiment, Sprague-Dawley rats were exposed to one of two housing conditions along with MA. Rats were given 0 (saline), 5, or 7.5 mg/kg MA, four times per day from postnatal day (P)11 to 15 or P11 to 20. Half of the litters were reared in cages with standard bedding and half with no bedding. Separate litters were assessed at P15 or P20 for organ weights (adrenals, spleen, thymus); corticosterone; and monoamine assessments (dopamine, serotonin, norepinephrine) and their metabolites within the neostriatum, hippocampus, and prefrontal cortex. Findings show neonatal MA altered monoamines, corticosterone, and organ characteristics alone, and as a function of developmental age and stress compared with controls. These alterations may in part be responsible for MA and early life stress-induced long-term learning and memory deficits.
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11
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Tian L, Dai Z, Liu X, Song B, Ye Z, Yuan J. Ratiometric Time-Gated Luminescence Probe for Nitric Oxide Based on an Apoferritin-Assembled Lanthanide Complex-Rhodamine Luminescence Resonance Energy Transfer System. Anal Chem 2015; 87:10878-85. [PMID: 26462065 DOI: 10.1021/acs.analchem.5b02347] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Using apoferritin (AFt) as a carrier, a novel ratiometric luminescence probe based on luminescence resonance energy transfer (LRET) between a Tb(3+) complex (PTTA-Tb(3+)) and a rhodamine derivative (Rh-NO), PTTA-Tb(3+)@AFt-Rh-NO, has been designed and prepared for the specific recognition and time-gated luminescence detection of nitric oxide (NO) in living samples. In this LRET probe, PTTA-Tb(3+) encapsulated in the core of AFt is the energy donor, and Rh-NO, a NO-responsive rhodamine derivative, bound on the surface of AFt is the energy acceptor. The probe only emits strong Tb(3+) luminescence because the emission of rhodamine is switched off in the absence of NO. Upon reaction with NO, accompanied by the turn-on of rhodamine emission, the LRET from Tb(3+) complex to rhodamine occurs, which results in the remarkable increase and decrease of the long-lived emissions of rhodamine and PTTA-Tb(3+), respectively. After the reaction, the intensity ratio of rhodamine emission to Tb(3+) emission, I565/I539, is ∼24.5-fold increased, and the dose-dependent enhancement of I565/I539 shows a good linearity in a wide concentration range of NO. This unique luminescence response allowed PTTA-Tb(3+)@AFt-Rh-NO to be conveniently used as a ratiometric probe for the time-gated luminescence detection of NO with I565/I539 as a signal. Taking advantages of high specificity and sensitivity of the probe as well as its good water-solubility, biocompatibility, and cell membrane permeability, PTTA-Tb(3+)@AFt-Rh-NO was successfully used for the luminescent imaging of NO in living cells and Daphnia magna. The results demonstrated the efficacy of the probe and highlighted it's advantages for the ratiometric time-gated luminescence bioimaging application.
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Affiliation(s)
- Lu Tian
- State Key Laboratory of Fine Chemicals, School of Chemistry, Dalian University of Technology , Dalian 116024, China
| | - Zhichao Dai
- State Key Laboratory of Fine Chemicals, School of Chemistry, Dalian University of Technology , Dalian 116024, China
| | - Xiangli Liu
- State Key Laboratory of Fine Chemicals, School of Chemistry, Dalian University of Technology , Dalian 116024, China
| | - Bo Song
- State Key Laboratory of Fine Chemicals, School of Chemistry, Dalian University of Technology , Dalian 116024, China
| | - Zhiqiang Ye
- State Key Laboratory of Fine Chemicals, School of Chemistry, Dalian University of Technology , Dalian 116024, China
| | - Jingli Yuan
- State Key Laboratory of Fine Chemicals, School of Chemistry, Dalian University of Technology , Dalian 116024, China
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