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Masenga SK, Povia JP, Mutengo KH, Hamooya BM, Nzala S, Heimburger DC, Munsaka SM, Elijovich F, Patel KP, Kirabo A. Sex differences in hypertension among people living with HIV after initiation of antiretroviral therapy. Front Cardiovasc Med 2022; 9:1006789. [PMID: 36465432 PMCID: PMC9715396 DOI: 10.3389/fcvm.2022.1006789] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Accepted: 10/31/2022] [Indexed: 11/19/2022] Open
Abstract
Background Hypertension is common in people living with HIV (PLWH) on antiretroviral therapy (ART). In the general population and in experimental animal models, the incidence of hypertension is greater in males than in females, especially during the premenopausal period. However, it is not known whether there are sex differences in hypertension associated with HIV and ART, and the factors contributing to incident hypertension among PLWH have not been well characterized. In this study, we aimed to determine the time course, sex differences and factors associated with incident hypertension in PLWH initiating ART. Methods and results We conducted a retrospective study in which we used programmatic data from the ART registry to identify sex differences in the determinants of incident hypertension among PLWH initiating the ART regimen from Livingstone University Teaching Hospital in Zambia and followed for 8 years. Males developed hypertension earlier, 2 years after initiating ART, compared to 6 years in females. In multivariable analysis, increasing age, baseline systolic blood pressure and baseline mean arterial pressure (MAP) were associated with increased risk for developing incident hypertension. Also, participants who switched to the integrase strand transfer inhibitor, dolutegravir (DTG) or the protease inhibitor, lopinavir boosted with ritonavir were 2 and 3 times more likely to develop hypertension when compared to those on non-nucleoside reverse transcriptase inhibitors (NNRTIs). However, these relationships were abrogated by sex, as self-reported male sex was the major contributor in predicting incident hypertension. While none of the factors remained significantly associated with incident hypertension upon multivariate analysis among females, body mass index (BMI), and use of protease inhibitors remained strongly associated with hypertension among males. Conclusion Our results indicate that the use of protease inhibitors and BMI are important predictors of incident hypertension among males. Thus, blood pressure and BMI should be closely monitored, particularly in males living with HIV on protease inhibitors. In addition, identifying specific factors that protect females from developing hypertension early is important but remains to be determined.
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Affiliation(s)
- Sepiso K. Masenga
- HAND Research Group, School of Medicine and Health Sciences, Mulungushi University, Livingstone, Zambia,School of Medicine, University of Zambia, Lusaka, Zambia
| | - Joreen P. Povia
- HAND Research Group, School of Medicine and Health Sciences, Mulungushi University, Livingstone, Zambia
| | - Katongo H. Mutengo
- HAND Research Group, School of Medicine and Health Sciences, Mulungushi University, Livingstone, Zambia
| | - Benson M. Hamooya
- HAND Research Group, School of Medicine and Health Sciences, Mulungushi University, Livingstone, Zambia
| | | | - Douglas C. Heimburger
- School of Medicine, University of Zambia, Lusaka, Zambia,Department of Medicine, Vanderbilt Institute for Global Health, Vanderbilt University Medical Center, Nashville, TN, United States
| | - Sody M. Munsaka
- Department of Biomedical Sciences, School of Health Sciences, University of Zambia, Lusaka, Zambia
| | - Fernando Elijovich
- Department of Medicine, Vanderbilt Institute for Global Health, Vanderbilt University Medical Center, Nashville, TN, United States
| | - Kaushik P. Patel
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, NE, United States
| | - Annet Kirabo
- Department of Medicine, Vanderbilt Institute for Global Health, Vanderbilt University Medical Center, Nashville, TN, United States,*Correspondence: Annet Kirabo,
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Masenga SK, Pilic L, Hamooya BM, Nzala S, Heimburger DC, Mutale W, Koethe JR, Kirabo A, Munsaka SM, Elijovich F. Immediate pressor response to oral salt and its assessment in the clinic: a time series clinical trial. Clin Hypertens 2022; 28:25. [PMID: 36104796 PMCID: PMC9476589 DOI: 10.1186/s40885-022-00209-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Accepted: 05/06/2022] [Indexed: 02/03/2023] Open
Abstract
BACKGROUND High blood pressure (BP) is associated with high-salt consumption especially in sub-Saharan Africa. Although the pressor effect of salt is viewed as a chronic effect, some studies suggest that a salty meal may increase BP immediately in some individuals, and that this effect may cause endothelial dysfunction. Therefore, the aim of our research was to study the immediate pressor response to oral salt (IPROS) and its determinants, with the expectation that a simple methodology may be devised to diagnose it in the clinic or in low-resource environments. METHODS We conducted a time series trial at Livingstone Central Hospital. We present data in 127 normotensive participants who ingested 2 g of sodium chloride; their BP was monitored for 120 minutes in intervals of 10 minutes. Sociodemographic and clinical data were collected. Descriptive and inferential statistics were used for analyses of data. RESULTS Median age was 30 years (interquartile range, 22-46 years) and 52% were female patients. An increase of ≥10 mmHg in mean arterial pressure (MAP), considered a clinically significant IPROS, was present in 62% of participants. Systolic BP 30 minutes after the salt load was a significant predictor of IPROS, avoiding the need to calculate MAP in the clinic setting. CONCLUSIONS We confirm the presence of an IPROS in a high proportion (62%) of otherwise normotensive participants. The average time course for this response was 30 minutes and its duration was sustained for the 120-minutes period of study in most of the participants. Prediction of IPROS by ∆SBP (change in systolic blood pressure) at 30 minutes allows for easy assessment of possible responder status in the clinic. Our data indicate that the IPROS to oral salt-loads in the range currently consumed by the Western world and African populations in single meals may increase the 24-hour BP load, which is a risk factor for hypertension and target organ damage. The relevance of our findings indicates the need to include dietary sodium assessment in the diagnosis, prevention, and management of high BP.
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Affiliation(s)
- Sepiso K. Masenga
- grid.442660.20000 0004 0449 0406HAND Research Group, School of Medicine and Health Sciences, Mulungushi University, Akapelwa street, LUTH Premises, Livingstone, Zambia ,grid.12984.360000 0000 8914 5257Department of Biomedical Sciences, School of Health Sciences, University of Zambia, Lusaka, Zambia
| | - Leta Pilic
- grid.417907.c0000 0004 5903 394XFaculty of Sport, Health and Applied Science, St. Mary’s University, Twickenham, London, UK
| | - Benson M. Hamooya
- grid.442660.20000 0004 0449 0406HAND Research Group, School of Medicine and Health Sciences, Mulungushi University, Akapelwa street, LUTH Premises, Livingstone, Zambia ,grid.12984.360000 0000 8914 5257School of Public Health and School of Medicine, University of Zambia, Lusaka, Zambia
| | - Selestine Nzala
- grid.12984.360000 0000 8914 5257School of Public Health and School of Medicine, University of Zambia, Lusaka, Zambia
| | - Douglas C. Heimburger
- grid.12984.360000 0000 8914 5257School of Public Health and School of Medicine, University of Zambia, Lusaka, Zambia ,grid.412807.80000 0004 1936 9916Department of Medicine, Vanderbilt Institute for Global Health and Vanderbilt University Medical Center, Nashville, TN USA
| | - Wilbroad Mutale
- grid.12984.360000 0000 8914 5257School of Public Health and School of Medicine, University of Zambia, Lusaka, Zambia
| | - John R. Koethe
- grid.412807.80000 0004 1936 9916Department of Medicine, Vanderbilt Institute for Global Health and Vanderbilt University Medical Center, Nashville, TN USA
| | - Annet Kirabo
- grid.412807.80000 0004 1936 9916Department of Medicine, Vanderbilt Institute for Global Health and Vanderbilt University Medical Center, Nashville, TN USA
| | - Sody M. Munsaka
- grid.12984.360000 0000 8914 5257Department of Biomedical Sciences, School of Health Sciences, University of Zambia, Lusaka, Zambia
| | - Fernando Elijovich
- grid.412807.80000 0004 1936 9916Department of Medicine, Vanderbilt Institute for Global Health and Vanderbilt University Medical Center, Nashville, TN USA
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Polepole P, Mudenda VC, Munsaka SM, Zhang L. Spectrum of common Hodgkin lymphoma and non-Hodgkin lymphomas subtypes in Zambia: a 3-year records review. J Health Popul Nutr 2021; 40:37. [PMID: 34425908 PMCID: PMC8383350 DOI: 10.1186/s41043-021-00261-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Accepted: 08/04/2021] [Indexed: 05/30/2023]
Abstract
BACKGROUND Lymphomas usually present with different occurrence patterns across different geographical locations, but their epidemiology in Zambia is yet to be extensively explored. OBJECTIVES To study the spectrum of lymphoma subtypes prevalent within the Zambian population. METHODS Histopathological records with suspected lymphoma at the University Teaching Hospital (UTH) in Lusaka from the year 2014 to 2016, diagnosed based on the 2008 World Health Organization (WHO) criteria were reviewed. The analysis was done in terms of type, sex, age, and site of biopsy; and Fisher's exact test was used for significance testing. RESULTS During the study period (2014-2016), there were more B cell neoplasms {222 (92.5%)} than T cell neoplasms {18 (7.5%)}. Non-Hodgkin's lymphoma (NHL) was seen in 191 (79.6%) whereas classic Hodgkin's lymphoma (CHL) was seen in 39 (16.3%). Burkitt's lymphoma (BL) and diffuse large B cell lymphoma (DLBCL) showed equal proportions {17.5% of all lymphoma cases (42/240) each}, as the most prevalent subtypes of NHL whereas marginal zone B cell lymphoma was the rarest subtype with 1.4% (4/240). For CHL, mixed cellularity and lymphocyte rich subtypes (4.6% of all lymphoma cases) were the most common subtypes. There was a statistically significant difference in the occurrences of lymphoma subtypes across different age categories (p = 0.002). CONCLUSION Zambia has a diverse lymphoma subtypes population, affecting a relatively young population. The data from this study will serve as a baseline for improved health care provision and more robust future studies.
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Affiliation(s)
- Pascal Polepole
- Department of Biomedical Sciences, University of Zambia School of Health Sciences, P.O. BOX 50110, Ridgeway, Lusaka, Zambia
| | - Victor C. Mudenda
- Department of Pathology and Microbiology, University Teaching Hospital, P.BAG RW1X, Lusaka, Zambia
| | - Sody M. Munsaka
- Department of Biomedical Sciences, University of Zambia School of Health Sciences, P.O. BOX 50110, Ridgeway, Lusaka, Zambia
| | - Luwen Zhang
- School of Biological Sciences, Nebraska Center for Virology, University of Nebraska, Lincoln, Nebraska 68588 USA
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Abstract
PURPOSE OF REVIEW With the advent of highly active antiretroviral therapy (ART), the life span of persons with HIV (PWH) has been nearly normalized. With aging, prevalence of the metabolic syndrome (MetS), including hypertension, has increased in the HIV population and exceeds that in the general population in some studies. This is due to a combination of traditional risk factors in addition to the effects attributable to the virus and ART. We review recent findings on the mechanisms contributing to MetS and hypertension in PWH, particularly those specific to the viral infection and to ART. RECENT FINDINGS Activation of the renin-angiotensin-aldosterone system (RAAS) and chronic immune activation contribute to the development of MetS and hypertension in PWH. HIV proteins and some ART agents alter adipocyte health contributing to dyslipidemias, weight gain, and insulin resistance. HIV infection also contributes to hypertension by direct effects on the RAAS that intertwine with inflammation by the RAAS also contributing to T cell activation. Recent data suggest that in addition to current ART, therapeutic targeting of the MetS and hypertension in PWH, by interfering with the RAAS, treating insulin resistance directly or by use of immunomodulators that dampen inflammation, may be critical for preventing or treating these risk factors and to improve overall cardiovascular complications in the HIV-infected aging population.
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Affiliation(s)
- Sepiso K Masenga
- HAND Research group, School of Medicine and Health Sciences, Mulungushi University, Livingstone, Zambia
- Department of Biomedical Sciences, School of Health Sciences, University of Zambia, Lusaka, Zambia
| | - Fernando Elijovich
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
| | - John R Koethe
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Benson M Hamooya
- HAND Research group, School of Medicine and Health Sciences, Mulungushi University, Livingstone, Zambia
- School of Public Health, University of Zambia, Lusaka, Zambia
| | - Douglas C Heimburger
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
- Department of Internal Medicine, School of Medicine, University of Zambia, Lusaka, Zambia
| | - Sody M Munsaka
- Department of Biomedical Sciences, School of Health Sciences, University of Zambia, Lusaka, Zambia
| | - Cheryl L Laffer
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Annet Kirabo
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA.
- Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Room 536 Robinson Research Building, Nashville, TN, 37232-6602, USA.
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5
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Masenga SK, Elijovich F, Hamooya BM, Nzala S, Kwenda G, Heimburger DC, Mutale W, Munsaka SM, Zhao S, Koethe JR, Kirabo A. Elevated Eosinophils as a Feature of Inflammation Associated With Hypertension in Virally Suppressed People Living With HIV. J Am Heart Assoc 2020; 9:e011450. [PMID: 32064996 PMCID: PMC7070208 DOI: 10.1161/jaha.118.011450] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Background People living with HIV (PLWH) are at increased risk of cardiovascular disease, including hypertension, which persists despite effective plasma viral suppression on antiretroviral therapy. HIV infection is characterized by long‐term alterations in immune function, but the contribution of immune factors to hypertension in PLWH is not fully understood. Prior studies have found that both innate and adaptive immune cell activation contributes to hypertension. Methods and Results We hypothesized that chronic inflammation may contribute to hypertension in PLWH. To test this hypothesis, we enrolled a cohort of 70 PLWH (44% hypertensive) on a long‐term single antiretroviral therapy regimen for broad phenotyping of inflammation biomarkers. We found that hypertensive PLWH had higher levels of inflammatory cytokines, including tumor necrosis factor‐α receptor 1, interleukin‐6, interleukin‐17, interleukin‐5, intercellular adhesion molecule 1 and macrophage inflammatory protein‐1α. After adjustment for age, sex, and fat mass index, the circulating eosinophils remained significantly associated with hypertension. On the basis of these results, we assessed the relationship of eosinophils and hypertension in 2 cohorts of 50 and 81 039 similar HIV‐negative people; although eosinophil count was associated with prevalent hypertension, this relationship was abrogated by body mass index. Conclusions These findings may represent a unique linkage between immune status and cardiovascular physiological characteristics in HIV infection, which should be evaluated further.
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Affiliation(s)
- Sepiso K Masenga
- School of Medicine and Health Sciences Mulungushi University Livingstone Zambia.,Department of Biomedical Sciences School of Health Sciences University of Zambia Lusaka Zambia.,Vanderbilt Institute for Global Health Vanderbilt University Medical Center Nashville TN
| | - Fernando Elijovich
- Division of Clinical Pharmacology Vanderbilt University Medical Center Nashville TN
| | - Benson M Hamooya
- School of Medicine and Health Sciences Mulungushi University Livingstone Zambia.,Department of Epidemiology and Biostatistics School of Public Health University of Zambia Lusaka Zambia
| | - Selestine Nzala
- Department of Medical Education Development University of Zambia Lusaka Zambia
| | - Geoffrey Kwenda
- Department of Biomedical Sciences School of Health Sciences University of Zambia Lusaka Zambia
| | - Douglas C Heimburger
- Vanderbilt Institute for Global Health Vanderbilt University Medical Center Nashville TN
| | - Wilbroad Mutale
- Department of Health Policy and Management School of Public Health University of Zambia Lusaka Zambia
| | - Sody M Munsaka
- Department of Biomedical Sciences School of Health Sciences University of Zambia Lusaka Zambia
| | - Shilin Zhao
- Department of Biostatistics Vanderbilt University Medical Center Nashville TN
| | - John R Koethe
- Division of Infectious Diseases Vanderbilt University Medical Center Nashville TN
| | - Annet Kirabo
- Division of Clinical Pharmacology Vanderbilt University Medical Center Nashville TN.,Department of Molecular Physiology and Biophysics Vanderbilt University Nashville TN
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Masenga SK, Hamooya BM, Nzala S, Kwenda G, Heimburger DC, Mutale W, Koethe JR, Kirabo A, Munsaka SM. HIV, immune activation and salt-sensitive hypertension (HISH): a research proposal. BMC Res Notes 2019; 12:424. [PMID: 31311574 PMCID: PMC6636142 DOI: 10.1186/s13104-019-4470-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Accepted: 07/11/2019] [Indexed: 11/25/2022] Open
Abstract
Objective The objective of this study is to quantify and compare the effect of excess dietary salt on immune cell activation and blood pressure in HIV versus HIV negative individuals. Results Salt-sensitivity is associated with increased immune cell activation in animal studies. This concept has not been tested in people living with HIV. This study will therefore add more information in elucidating the interaction between HIV infection and/or anti-retroviral therapy (ART), immune-activation/inflammation and hypertension. Electronic supplementary material The online version of this article (10.1186/s13104-019-4470-2) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Sepiso K Masenga
- School of Medicine and Health Sciences, Mulungushi University, Livingstone, Zambia. .,Department of Biomedical Sciences, School of Health Sciences, University of Zambia, Lusaka, Zambia. .,Vanderbilt Institute for Global Health, Nashville, TN, USA.
| | - Benson M Hamooya
- School of Medicine and Health Sciences, Mulungushi University, Livingstone, Zambia.,Department of Epidemiology and Biostatistics, School of Public Health, University of Zambia, Lusaka, Zambia
| | - Selestine Nzala
- Department of Medical Education Development, University of Zambia, Lusaka, Zambia
| | - Geoffrey Kwenda
- Department of Biomedical Sciences, School of Health Sciences, University of Zambia, Lusaka, Zambia
| | | | - Wilbroad Mutale
- Department of Health Policy and Management, School of Public Health, University of Zambia, Lusaka, Zambia
| | - John R Koethe
- Division of Infectious Diseases, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Annet Kirabo
- Division of Clinical Pharmacology, Vanderbilt University Medical Center, Nashville, TN, USA.,Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN, USA
| | - Sody M Munsaka
- Department of Biomedical Sciences, School of Health Sciences, University of Zambia, Lusaka, Zambia
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Masenga SK, Hamooya BM, Nzala S, Kwenda G, Heimburger DC, Mutale W, Munsaka SM, Koethe JR, Kirabo A. Patho-immune Mechanisms of Hypertension in HIV: a Systematic and Thematic Review. Curr Hypertens Rep 2019; 21:56. [PMID: 31165257 PMCID: PMC6548744 DOI: 10.1007/s11906-019-0956-5] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
PURPOSE OF REVIEW To systematically review recent findings on the role of immune cell activation in the pathogenesis of hypertension in people living with HIV (PLWH) and compare studies from Sub-Saharan Africa with what is reported in the USA and European literature according to guidelines of the Preferred Reporting Items for Systematic Reviews and Meta-Analyses. RECENT FINDINGS PLWH have an increased risk for development of hypertension and cardiovascular disease. Chronic immune activation contributes to hypertension but the inflammatory milieu that predisposes PLWH to hypertension is poorly understood. We identified 45 relevant studies from 13 unique African countries. The prevalence of hypertension in PLWH on antiretroviral therapy (ART) and the ART-naive PLWH ranged from 6 to 50% and 2 to 41%, respectively. Interleukin (IL)-17A, interferon (IFN)-γ, and higher CD4+ T cell counts were associated with hypertension in ART-treated participants. Targeting adaptive immune activation could provide improved care for hypertensive PLWH. Further research is needed to characterize the inflammatory milieu contributing to hypertension in PLWH especially in African populations where the global burden of HIV is the highest.
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Affiliation(s)
- Sepiso K. Masenga
- School of Medicine and Health Sciences, Mulungushi University, Livingstone, Zambia
- School of Health Sciences, Department of Biomedical Sciences, University of Zambia, Lusaka, Zambia
- Vanderbilt Institute for Global Health, Nashville, TN USA
| | - Benson M. Hamooya
- School of Medicine and Health Sciences, Mulungushi University, Livingstone, Zambia
- School of Public Health, Department of Epidemiology and Biostatistics, University of Zambia, Lusaka, Zambia
| | - Selestine Nzala
- Department of Medical Education Development, University of Zambia, Lusaka, Zambia
| | - Geoffrey Kwenda
- School of Health Sciences, Department of Biomedical Sciences, University of Zambia, Lusaka, Zambia
| | | | - Wilbroad Mutale
- School of Public Health, Department of Health policy and Management, University of Zambia, Lusaka, Zambia
| | - Sody M. Munsaka
- School of Health Sciences, Department of Biomedical Sciences, University of Zambia, Lusaka, Zambia
| | - John R. Koethe
- Division of Infectious Diseases, Vanderbilt University Medical Center, Nashville, TN USA
| | - Annet Kirabo
- Department of Medicine, Division of Clinical Pharmacology, Vanderbilt University Medical Center, 2215 Garland Avenue, P415C Medical Research Building IV, Nashville, TN 37232 USA
- Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN USA
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Chiboola H, Munsaka SM. Nature and role of traditional forms of counselling in Zambia: a case of Lusaka province. British Journal of Guidance & Counselling 2016. [DOI: 10.1080/03069885.2016.1187710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Hector Chiboola
- Faculty of Social Sciences, Chreso University, Lusaka, Zambia
| | - Sody M. Munsaka
- Faculty of Social Sciences, Chreso University, Lusaka, Zambia
- Department of Biomedical Sciences, School of Medicine, University of Zambia, Lusaka, Zambia
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Chang L, Munsaka SM, Kraft-Terry S, Ernst T. Magnetic resonance spectroscopy to assess neuroinflammation and neuropathic pain. J Neuroimmune Pharmacol 2013; 8:576-93. [PMID: 23666436 DOI: 10.1007/s11481-013-9460-x] [Citation(s) in RCA: 191] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2013] [Accepted: 04/14/2013] [Indexed: 02/07/2023]
Abstract
Proton magnetic resonance spectroscopy ((1)H MRS) has been applied to numerous clinical studies, especially for neurological disorders. This technique can non-invasively evaluate brain metabolites and neurochemicals in selected brain regions and is particularly useful for assessing neuroinflammatory disorders. Neurometabolites assessed with MRS include the neuronal markers N-acetylaspartate (NAA) and glutamate (Glu), as well as the glial marker myo-inositol (MI). Therefore, the concentrations of these metabolites typically correspond to disease severity and often correlate well with clinical variables in the various brain disorders. Neuroinflammation with activated astrocytes and microglia in brain disorders are often associated with elevated MI, and to a lesser extent elevated total creatine (tCr) and choline containing compounds (Cho), which are found in higher concentrations in glia than neurons, while neuronal injury is indicated by lower than normal levels of NAA and Glu. This review summarizes the neurometabolite abnormalities found in MRS studies performed in patients with neuroinflammatory disorders or neuropathic pain, which also may be associated with neuroinflammation. These brain disorders include multiple sclerosis, neuroviral infections (including Human Immunodeficiency virus and Hepatitis C), degenerative brain disorders (including Alzheimer's disease and Parkinson's disease), stimulant abuse (including methamphetamine and cocaine) as well as several chronic pain syndromes.
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Affiliation(s)
- Linda Chang
- Department of Medicine, John A. Burns School of Medicine, University of Hawai'i at Manoa, Neuroscience and Magnetic Resonance Research Program, The Queen's Medical Center, 1356 Lusitana Street, UH Tower 7th Floor, Honolulu, HI 96813, USA.
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Munsaka SM, Agsalda M, Troelstrup D, Hu N, Yu Q, Shiramizu B. Characteristics of Activated Monocyte Phenotype Support R5-Tropic Human Immunodeficiency Virus. ACTA ACUST UNITED AC 2009; 1:15-20. [PMID: 19997535 DOI: 10.4137/iii.s2011] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND: Microbial translocation has been recognized as an important factor in monocyte activation and contributing to AIDS pathogenesis with elevated plasma lipopolysaccharide (LPS) levels, as a marker for microbial translocation, seen in advanced HIV disease. Therefore, the current study was undertaken to assess monocyte activation in vitro by LPS and to determine its impact on monocyte phenotype. METHODS: Monocytes from non-HIV-infected donors were analyzed for CD14, CD16, CD69, TNFα, and CCR5 by flow cytometry pre- and post-stimulation with LPS. In-vitro cultures were then set up to expose non-activated and activated monocytes to R5-, X4-, and dual (R5/X4)-tropic viruses; and the amount of HIV present on the cells was assayed. RESULTS: Non-HIV-infected monocytes, after LPS stimulation, were confirmed to have an activated phenotype with increase in CD16 and CD69 surface expressions (p<0.05). The activation phenotype was supported by increase in TNFα production, p<0.05. The activated monocytes had increased surface CCR5 (from 21% to 98%; p=0.05); and were found to have more R5-tropic virus than non-activated monocytes (p<0.05). CONCLUSIONS: Following activation by LPS, non-HIV-infected monocytes were found to have increase in surface CCR5. These activated monocytes, when exposed to R5-tropic virus, were found to have more virus compared to non-activated monocytes. The significance of the findings could lie in explaining how microbial translocation plays a role in HIV progression; and possibly promoting CCR5-directed strategies in treating HIV.
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Affiliation(s)
- Sody M Munsaka
- Hawaii AIDS Clinical Research Program, Department of Medicine, John A Burns School of Medicine, University of Hawaii, Honolulu, Hawaii
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