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Dowd S, Sharo C, Abdulmalik O, Elmer J. Optimizing the lyophilization of Lumbricus terrestris erythrocruorin. ARTIFICIAL CELLS, NANOMEDICINE, AND BIOTECHNOLOGY 2024; 52:291-299. [PMID: 38733371 PMCID: PMC11218865 DOI: 10.1080/21691401.2024.2352003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2024] [Accepted: 04/29/2024] [Indexed: 05/13/2024]
Abstract
Haemorrhagic shock is a leading cause of death worldwide. Blood transfusions can be used to treat patients suffering severe blood loss but donated red blood cells (RBCs) have several limitations that limit their availability and use. To solve the problems associated with donated RBCs, several acellular haemoglobin-based oxygen carriers (HBOCs) have been developed to restore the most important function of blood: oxygen transport. One promising HBOC is the naturally extracellular haemoglobin (i.e. erythrocruorin) of Lumbricus terrestris (LtEc). The goal of this study was to maximise the portability of LtEc by lyophilising it and then testing its stability at elevated temperatures. To prevent oxidation, several cryoprotectants were screened to determine the optimum formulation for lyophilisation that could minimise oxidation of the haem iron and maximise recovery. Furthermore, samples were also deoxygenated prior to storage to decrease auto-oxidation, while resuspension in a solution containing ascorbic acid was shown to partially reduce LtEc that had oxidised during storage (e.g. from 42% Fe3+ to 11% Fe3+). Analysis of the oxygen equilibria and size of the resuspended LtEc showed that the lyophilisation, storage, and resuspension processes did not affect the oxygen transport properties or the structure of the LtEc, even after 6 months of storage at 40 °C. Altogether, these efforts have yielded a shelf-stable LtEc powder that can be stored for long periods at high temperatures, but future animal studies will be necessary to prove that the resuspended product is a safe and effective oxygen transporter in vivo.
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Affiliation(s)
- Sean Dowd
- Department of Chemical & Biological Engineering, Villanova University, Villanova, Pennsylvania, USA
| | - Catherine Sharo
- Department of Chemical & Biological Engineering, Villanova University, Villanova, Pennsylvania, USA
| | - Osheiza Abdulmalik
- Division of Hematology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Jacob Elmer
- Department of Chemical & Biological Engineering, Villanova University, Villanova, Pennsylvania, USA
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Song BK, Carr DA, Bruce ED, Nugent WH. Oxygenation through oral Ox66 in a two-hit rodent model of respiratory distress. ARTIFICIAL CELLS, NANOMEDICINE, AND BIOTECHNOLOGY 2024; 52:114-121. [PMID: 38423099 DOI: 10.1080/21691401.2024.2307462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Accepted: 01/10/2024] [Indexed: 03/02/2024]
Abstract
Acute respiratory distress syndrome (ARDS) is a complication of pulmonary disease that produces life-threatening hypoxaemia. Despite ventilation and hyperoxic therapies, undetected hypoxia can manifest in capillary beds leading to multi-organ failure. Ox66™ is an ingestible, solid-state form of oxygen designed to supplement oxygen deficits. Twenty-four anaesthetized rats underwent a two-hit model of respiratory distress (ARDS), where a single dose (5 mg/kg) of lipopolysaccharide (LPS) was given intratracheally, and then the respiratory tidal volume was reduced by 40%. After 60 min, animals were randomized to receive Ox66™, or normal saline (NS; vehicle control) via gavage or supplemental inspired oxygen (40% FiO2). A second gavage was administered at 120 min. Cardiovascular function and blood oximetry/chemistry were measured alongside the peripheral spinotrapezius muscle's interstitial oxygenation (PISFO2). ARDS reduced mean arterial pressure (MAP) and PISFO2 compared to baseline (BL) for all treatment groups. Treatment with Ox66 or NS did not improve MAP, but 40% FiO2 caused a rapid return to BL. PISFO2 improved after treatment with Ox66™ and 40% FiO2 and remained elevated for both groups against NS until study conclusion. Both oxygen treatments also suppressed the inflammatory response to LPS, suggesting that Ox66™ can deliver therapeutically-impactful levels of oxygen in situations of pulmonary dysfunction.
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Affiliation(s)
| | | | - Erica D Bruce
- Department of Environmental Science, Baylor University, Waco, TX, USA
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Nugent WH, Sheppard FR, Vandegriff KD, Schindler WM, Malavalli A, Song BK. EXCHANGE TRANSFUSION WITH VS -101: A NEW PEGYLATED-HB DESIGNED TO RESTORE PERFUSION AND INCREASE O 2 CARRYING CAPACITY. Shock 2024; 61:304-310. [PMID: 38117095 DOI: 10.1097/shk.0000000000002293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2023]
Abstract
ABSTRACT Blood products are the current standard for resuscitation of hemorrhagic shock. However, logistical constraints of perishable blood limit availability and prehospital use, meaning alternatives that provide blood-like responses remain an area of active investigation and development. VS-101 is a new PEGylated human hemoglobin-based oxygen carrier that avoids the logistical hurdles of traditional blood transfusion. This study sought to determine the safety and ability of VS -101 to maintain circulatory function and capillary oxygen delivery in a severe (50%) exchange transfusion (ET) model. Anesthetized, male Sprague Dawley rats were prepared for cardiovascular monitoring and phosphorescence quenching microscopy of interstitial fluid oxygen tension (P ISFo2 ) in the spinotrapezius muscle. Fifty-percent isovolemic ET of estimated total blood volume with either lactated Ringer's solution (LRS, n = 8) or VS -101 (n = 8) at 1 mL/kg/min was performed, and animals were observed for 240 min. VS -101 maintained P ISFo2 at baseline with a transient 18 ± 4 mm Hg decrease ( P < 0.05) in mean arterial pressure (MAP). In contrast, ET with LRS decreased P ISFo2 by approximately 50% ( P < 0.05) and MAP by 74 ± 10 mm Hg ( P < 0.05). All VS -101 animals survived 240 min, the experimental endpoint, while 100% of LRS animals expired by 142 min. VS -101 animals maintained normal tissue oxygenation through 210 min, decreasing by 25% ( P < 0.05 vs. baseline) thereafter, likely from VS -101 vascular clearance. No arteriolar vasoconstriction was observed following VS -101 treatment. In this model of severe ET, VS -101 effectively maintained blood pressure, perfusion, and P ISFo2 with no vasoconstrictive effects. Further elucidation of these beneficial resuscitation effects of VS -101 is warranted to support future clinical trials.
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Affiliation(s)
| | - Forest R Sheppard
- Department of Surgery, Division of Acute Care Surgery, Maine Medical Center, Portland, Maine
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Wang L, Wang T, Wu G, Tian D. An HDBB-based fluorescent probe for the sensitive detection of human serum albumin. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2024; 16:427-433. [PMID: 38165671 DOI: 10.1039/d3ay01733h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2024]
Abstract
The detection of human serum albumin (HSA) in bodily fluids is of great significance in the biomedical area because HSA in bodily fluids is commonly used as a biomarker for the early diagnosis of diseases. To detect HSA, we employed HDBB, 4,4'-(hydrazine-1,2-diylidene bis(methanylylidene)) bis(3-hydroxybenzoic acid), as a fluorescent probe with a large Stokes shift. HDBB had obvious excited state intramolecular proton transfer (ESIPT) and aggregation-induced emission (AIE) features. We elucidated the ESIPT characteristics of HDBB through the DFT approach. We also performed a molecular docking simulation between HDBB and HSA, showing that HDBB primarily bonded to HSA via hydrophobic force and hydrogen bonds. The FL intensities of HDBB with HSA concentrations had a linear range of 0.01-0.2 mg mL-1 (R2 = 0.9995), and the LOD was 1.104 μg mL-1. We also used the probe to detect HSA in urine, with spiked recoveries of 98.10-105.33%. Given its high selectivity and feasible synthesis, HDBB has potential applications in detecting HSA in real biological systems.
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Affiliation(s)
- Liwen Wang
- Hubei Key Laboratory of Biological Resources Protection and Utilization, School of Chemical and Environmental Engineering, Hubei Minzu University, Enshi 445000, PR China.
| | - Tengfei Wang
- Hubei Key Laboratory of Biological Resources Protection and Utilization, School of Chemical and Environmental Engineering, Hubei Minzu University, Enshi 445000, PR China.
| | - Guang Wu
- Hubei Key Laboratory of Biological Resources Protection and Utilization, School of Chemical and Environmental Engineering, Hubei Minzu University, Enshi 445000, PR China.
| | - Dating Tian
- Hubei Key Laboratory of Biological Resources Protection and Utilization, School of Chemical and Environmental Engineering, Hubei Minzu University, Enshi 445000, PR China.
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Nugent WH, Carr DA, Friedman J, Song BK. Novel transdermal curcumin therapeutic preserves endothelial barrier function in a high-dose LPS rat model. ARTIFICIAL CELLS, NANOMEDICINE, AND BIOTECHNOLOGY 2023; 51:33-40. [PMID: 36656591 DOI: 10.1080/21691401.2022.2164584] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Sepsis is a devastating complication of infection and injury that, through widespread endothelial dysfunction, can cause perfusion deficits and multi-organ failure. To address the recognised need for therapeutics targetting the endothelial barrier, a topical formulation (CUR; VASCEPTOR™; Vascarta Inc, Summit, NJ) was developed to transdermally deliver bio-active concentrations of curcumin-an anti-inflammatory and nitric oxide promoter. Male, Sprague Dawley rats were treated daily with lipopolysaccharide (LPS, 10 mg/kg, IP) to induce endotoxemia, and topical applications of Vehicle Control (LPS + VC; N = 7) or Curcumin (LPS + CUR; N = 7). A third group received neither LPS nor treatment (No-LPS; N = 8). After 72 h, animals were surgically prepared for measurements of physiology and endothelial dysfunction in the exteriorised spinotrapezius muscle through the extravasation of 67 kDa TRITC-BSA (albumin) and 500 kDa FITC-dextran (dextran). At 72 h, LPS + VC saw weight loss, and increases to pulse pressure, lactate, pCO2, CXCL5 (vs No-LPS) and IL-6 (vs 0 h; p < 0.05). LPS + CUR was similar to No-LPS, but with hypotension. Phenylephrine response was increased in LPS + CUR. Regarding endothelial function, LPS + CUR albumin and dextran extravasation were significantly reduced versus LPS + VC suggesting that Curcumin mitigated endotoxemic endothelial dysfunction. The speculated mechanisms are nitric oxide modulation of the endothelium and/or an indirect anti-inflammatory effect.
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Affiliation(s)
| | | | - Joel Friedman
- Department of Physiology and Biophysics, Albert Einstein College of Medicine, Bronx, NY, USA.,Vascarta, Inc, Summit, NJ, USA
| | - Bjorn K Song
- Song Biotechnologies LLC, Cockeysville, MD, USA.,Vascarta, Inc, Summit, NJ, USA
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Hui W, Mu W, Zhao C, Xue D, Zhong Z, Fang Y, Gao M, Li X, Gao S, Liu K, Yan K. Solid-Phase Polymerization Using Anion-Exchange Resin Can Almost Completely Crosslink Hemoglobin to Prepare Hemoglobin-Based Oxygen Carriers. Int J Nanomedicine 2023; 18:1777-1791. [PMID: 37041816 PMCID: PMC10083038 DOI: 10.2147/ijn.s403739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Accepted: 03/24/2023] [Indexed: 04/07/2023] Open
Abstract
Introduction A limitation of hemoglobin-based oxygen carriers (HBOCs) as oxygen therapeutics is unpolymerized hemoglobin, which induces vasoconstriction leading to hypertension. The removal of unpolymerized hemoglobin from polymerized hemoglobin (PolyHb) is complex, expensive, and time-consuming. Methods Herein, we developed a method to completely polymerize hemoglobin almost without unpolymerized hemoglobin. Hemoglobin was adsorbed on the anion-exchange resin Q Sepharose Fast Flow or DEAE Sepharose Fast Flow, and acetal, a crosslinker prepared from glutaraldehyde and ethylene glycol, was employed to polymerize the hemoglobin. The polymerization conditions, including reaction time, pH, resin type, and molar ratios of glutaraldehyde to ethylene glycol and hemoglobin to acetal, were optimized. The blood pressure and blood gas of mice injected with PolyHb were monitored as well. Results The optimal polymerization condition of PolyHb was when the molar ratio of glutaraldehyde to ethylene glycol was 1:20, and the molar ratio of 10 mg/mL hemoglobin adsorbed on anion-exchange resin to glutaraldehyde was 1:300 for 60 min. Under optimized reactive conditions, hemoglobin was almost completely polymerized, with <1% hemoglobin remaining unpolymerized, and the molecular weight of PolyHb was more centrally distributed. Furthermore, hypertension was not induced in mice by PolyHb, and there were also no pathological changes observed in arterial oxygen, blood gas, electrolytes, and some metabolic indicators. Conclusion The findings of this study indicate that the use of solid-phase polymerization and acetal is a highly effective and innovative approach to HBOCs, resulting in the almost completely polymerized hemoglobin. These results offer promising implications for the development of new methods for preparing HBOCs.
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Affiliation(s)
- Wenli Hui
- College of Life Science, Northwest University, Xi’an City, Shaanxi Province, 710069, People’s Republic of China
| | - Wenhua Mu
- College of Life Science, Northwest University, Xi’an City, Shaanxi Province, 710069, People’s Republic of China
| | - Cong Zhao
- College of Life Science, Northwest University, Xi’an City, Shaanxi Province, 710069, People’s Republic of China
| | - Dan Xue
- College of Life Science, Northwest University, Xi’an City, Shaanxi Province, 710069, People’s Republic of China
| | - Zihua Zhong
- College of Life Science, Northwest University, Xi’an City, Shaanxi Province, 710069, People’s Republic of China
| | - Yani Fang
- College of Life Science, Northwest University, Xi’an City, Shaanxi Province, 710069, People’s Republic of China
| | - Ming Gao
- College of Life Science, Northwest University, Xi’an City, Shaanxi Province, 710069, People’s Republic of China
| | - Xiao Li
- College of Life Science, Northwest University, Xi’an City, Shaanxi Province, 710069, People’s Republic of China
| | - Shihao Gao
- College of Life Science, Northwest University, Xi’an City, Shaanxi Province, 710069, People’s Republic of China
| | - Kaiyue Liu
- College of Life Science, Northwest University, Xi’an City, Shaanxi Province, 710069, People’s Republic of China
| | - Kunping Yan
- College of Life Science, Northwest University, Xi’an City, Shaanxi Province, 710069, People’s Republic of China
- Correspondence: Kunping Yan, Email
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Carr DA, Nugent WH, Bruce ED, Song BK. Evaluation of an Injectable, Solid-State, Oxygen-Delivering Compound (Ox66) in a Rodent Model of Pulmonary Dysfunction-Induced Hypoxia. Mil Med 2022; 188:usac059. [PMID: 35284916 DOI: 10.1093/milmed/usac059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Revised: 01/26/2022] [Accepted: 02/24/2022] [Indexed: 02/21/2024] Open
Abstract
INTRODUCTION Pulmonary dysfunction (PD) and its associated hypoxia present a complication to the care of many service members and can arise intrinsically via comorbidities or extrinsically by infection or combat-related trauma (burn, smoke inhalation, and traumatic acute lung injury). Current supportive treatments (e.g., ventilation and supplemental oxygen) relieve hypoxia but carry a significant risk of further lung injury that drives mortality. Ox66 is a novel, solid-state oxygenating compound capable of delivering oxygen via intravenous infusion. MATERIALS AND METHODS Male Sprague Dawley rats (N = 21; 250-300 g) were surgically prepared for cardiovascular monitoring, fluid infusion, mechanical ventilation, and intravital and phosphorescence quenching microscopy (interstitial oxygen tension; PISFO2) of the spinotrapezius muscle. Baselines (BL) were collected under anesthesia and spontaneous respiration. PD was simulated via hypoventilation (50% tidal volume reduction) and was maintained for 3 hours. Groups were randomized to receive Ox66, normal saline (NS; vehicle control), or Sham (no treatment) and were treated immediately following PD onset. Arterial blood samples (65 µL) and intravital images were taken hourly to assess blood gases and chemistry and changes in arteriolar diameter, respectively. Significance was taken at P < .05. RESULTS PD reduced PISFO2 for all groups; however, by 75 minutes, both NS and Sham were significantly lower than Ox66 and remained so until the end of PD. Serum lactate levels were lowest in the Ox66 group-even decreasing relative to BL-but only significant versus Sham. Furthermore, all Ox66 animals survived the full PD challenge, while one NS and two Sham animals died. No significant vasoconstrictive or vasodilative effect was noted within or between experimental groups. CONCLUSION Treatment with intravenous Ox66 improved interstitial oxygenation in the spinotrapezius muscle-a recognized bellwether for systemic capillary function-suggesting an improvement in oxygen delivery. Ox66 offers a novel approach to supplemental oxygenation that bypasses lung injury and dysfunction.
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Affiliation(s)
| | | | - Erica D Bruce
- Baylor University, Waco, TX 76706, USA
- Baylor University, Department of Environmental Science, Waco, TX 76798, USA
- Baylor University, Department of Biology, Waco, TX 76798, USA
- Baylor University, Institute of Biomedical Studies, Waco, TX 76798, USA
| | - Bjorn K Song
- Song Biotechnologies, Cockeysville, MD 21030, USA
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Paul KD, Rani S, Luxami V, Gupta S. A novel target and biomarker benzothiazolyl-naphthalimide probes for precisely and selective detection of serum albumin and anticancer activity. NEW J CHEM 2022. [DOI: 10.1039/d1nj03650e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
N-Benzothiazolyl-1,8-naphthalimide based fluorescence probes were designed and synthesized for selective detection of human serum albumin (HSA) and Bovine serum albumin (BSA) among various bioanalytes and further studied for their in...
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Nugent WH, Carr DA, MacBryde R, Bruce ED, Song BK. Gavage approach to oxygen supplementation with oxygen therapeutic Ox66™ in a hypoventilation rodent model of respiratory distress. ARTIFICIAL CELLS, NANOMEDICINE, AND BIOTECHNOLOGY 2021; 49:709-716. [PMID: 34889690 DOI: 10.1080/21691401.2021.2013251] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Revised: 07/13/2021] [Accepted: 11/24/2021] [Indexed: 06/13/2023]
Abstract
Acute respiratory distress syndrome (ARDS) features pulmonary dysfunction capable of causing life-threatening hypoxaemia. Ventilation and hyperoxic therapies force oxygen through dysfunctional alveoli but risk exacerbating damage. Ox66™ is an ingestible, solid-state oxygen product designed for oxygen supplementation. Eighteen anaesthetized, ventilated rats were subjected to a 40% reduction in tidal volume to produce a hypoventilatory simulation of the hypoxia in ARDS (HV-ARDS). After 60 min, animals were randomized to receive either normal saline (Saline; volume control) or Ox66™ gavage. Cardiovascular function and blood oximetry/chemistry were measured alongside interstitial oxygenation (PISFO2) of the peripheral spinotrapezius muscle. HV-ARDS reduced mean arterial pressure by ∼20% and PISFO2 by ∼35% for both groups. Ox66™ gavage treatment at 60 min improved PISFO2 over Saline (p < .0001), restoring baseline values, however, the effect was temporary. A second bolus at 120 min repeated the OX66™ PISFO2 response, which remained elevated over Saline (p < .01) until study end and was supported by systemic parameters of lactate, PaO2, SO2, and base deficit. Saline remained hypotensive, whereas Ox66™ became normotensive. Vasoconstriction was observed in the Saline, but not Ox66™ group. Supplemental oxygenation through Ox66™ gavage increased peripheral tissue oxygenation, warranting further study for disorders featuring dysfunction of pulmonary perfusion like ARDS.
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Microvascular and Systemic Impact of Resuscitation with PEGylated Carboxyhemoglobin-Based Oxygen Carrier or Hetastarch in a Rat Model of Transient Hemorrhagic Shock. Shock 2021; 53:493-502. [PMID: 31045989 DOI: 10.1097/shk.0000000000001370] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
BACKGROUND Hemorrhage is the leading cause of preventable, traumatic death. Currently, prehospital resuscitation fluids provide preload but not oxygen-carrying capacity-a critical blood function that mitigates microvascular ischemia and tissue hypoxia during hemorrhagic shock. Solutions containing polymerized hemoglobin have been associated with vasoactive and hypertensive events. A novel hemoglobin-based oxygen carrier, modified with PEGylation and CO moieties (PEG-COHb), may overcome these limitations. OBJECTIVES To evaluate the systemic and microcirculatory effects of PEG-COHb as compared with the 6% hetastarch in a rat model of hemorrhagic shock. METHODS Male Sprague Dawley rats (N = 20) were subjected to severe, controlled, hemorrhagic shock. Animals were randomized to 20% estimated blood-volume resuscitation with either 6% hetastarch or PEG-COHb. Continuous, invasive, cardiovascular measurements, and arterial blood gases were measured. Microcirculatory measurements of interstitial oxygenation (PISFO2) and vasoactivity helped model oxygen delivery in the spinotrapezius muscle using intravital and phosphorescence quenching microscopy. RESULTS Hemorrhage reduced mean arterial pressure (MAP), arteriolar diameter, and PISFO2, and increased lactate 10-fold in both groups. Resuscitation with both PEG-COHb and hetastarch improved cardiovascular parameters. However, PEG-COHb treatment resulted in higher MAP (P < 0.001), improved PISFO2 (14 [PEG-COHb] vs. 5 [hetastarch] mmHg; P < 0.0001), lower lactate post-resuscitation (P < 0.01), and extended survival from 90 to 142 min (P < 0.001) as compared with the hetastarch group. CONCLUSIONS PEG-COHb improved MAP PISFO2, lactate, and survival time as compared with 6% hetastarch resuscitation. Importantly, hypertension and vasoactivity were not detected in response to PEG-COHb resuscitation supporting further investigation of this resuscitation strategy.
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Stankiewicz J, Jeyaraju M, Maheshwari S, Deitchman AR, McCurdy MT. Sublingual Microcirculatory Characteristics of a Case of Profound Chemotherapy-Induced Anemia Treated With a Hemoglobin-Based Oxygen Carrier. Cureus 2021; 13:e15048. [PMID: 34150399 PMCID: PMC8203304 DOI: 10.7759/cureus.15048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Handheld vital microscopy (HVM) can deepen our understanding of hematologic diseases and therapeutics. However, limited reports have assessed human microcirculation during profound anemia, and response to hemoglobin-based oxygen carriers (HBOCs). A 58-year-old woman presented with constitutional symptoms and was diagnosed with acute myeloblastic leukemia. Subsequently, the patient clinically decompensated and was found to have a hemoglobin of 1.9 g/dL. Human blood product administration was not consistent with her beliefs, and she received supportive care with HBOC-201. Concomitantly, her sublingual microcirculation revealed a markedly low microvascular flow index (2.59±0.26), proportion perfused vessels (66.8±18.8%), perfused vessel density (4.41±0.56 mm/mm2), and total vessel density (6.93±1.91 mm/mm2). HVM imaging is a promising point-of-care device for various hematologic conditions, with the potential to understand tissue-level perfusion in novel clinical scenarios, including profound anemia and HBOC administration, as illustrated in this case report.
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Affiliation(s)
- Jason Stankiewicz
- Division of Pulmonary and Critical Care, University of Maryland School of Medicine, Baltimore, USA
| | - Maniraj Jeyaraju
- Division of Pulmonary and Critical Care, University of Maryland School of Medicine, Baltimore, USA
| | - Sanjay Maheshwari
- Division of Pulmonary and Critical Care, University of Maryland School of Medicine, Baltimore, USA
| | | | - Michael T McCurdy
- Division of Pulmonary and Critical Care, University of Maryland School of Medicine, Baltimore, USA
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Apohemoglobin-haptoglobin complexes attenuate the hypertensive response to low-molecular-weight polymerized hemoglobin. Blood Adv 2021; 4:2739-2750. [PMID: 32559292 DOI: 10.1182/bloodadvances.2020002045] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Accepted: 05/15/2020] [Indexed: 01/21/2023] Open
Abstract
Polymerized hemoglobin (PolyHb) is a promising hemoglobin (Hb)-based oxygen carrier currently undergoing development as a red blood cell substitute. Unfortunately, commercially developed products are composed of low-molecular-weight (LMW) PolyHb molecules, which extravasate, scavenge nitric oxide, and result in vasoconstriction and hypertension. The naturally occurring Hb-scavenging species haptoglobin (Hp), combined with the purified heme-scavenging species apohemoglobin (apoHb), is a potential candidate to alleviate the pressor effect of PolyHb. This study evaluated the protective activity of administering the apoHb-Hp complex to mitigate the vasoactive response induced by the transfusion of LMW PolyHb. Hp binding to PolyHb was characterized in vitro. The effectiveness of apoHb-Hp administration on reducing the vasoconstriction and pressor effects of PolyHb was assessed by measuring systemic and microcirculatory hemodynamics. Transfusion of LMW PolyHb to vehicle control pretreated animals increased mean arterial pressure while decreasing arteriole diameter and functional capillary density. However, transfusion of LMW PolyHb to apoHb-Hp pretreated animals prevented changes in mean arterial pressure, heart rate, arteriole diameter, blood flow, and functional capillary density relative to before transfusion. These results indicate that the increased size of PolyHb after binding to the apoHb-Hp complex may help compartmentalize PolyHb in the vascular space and thus reduce extravasation, nitric oxide scavenging, and toxicity responsible for vasoconstriction and systemic hypertension.
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13
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Kang N, Pei S, Zhang C, Zhang G, Zhou Y, Fan L, Yao Q, Wang W, Shuang S, Dong C. A red emitting fluorescent probe based on TICT for selective detection and imaging of HSA. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 250:119409. [PMID: 33422865 DOI: 10.1016/j.saa.2020.119409] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 12/21/2020] [Accepted: 12/29/2020] [Indexed: 06/12/2023]
Abstract
A red emitting fluorescence probe, TPA-CPO, based on twisted intra-molecular charge transfer (TICT) was designed and synthesized. The spectra results displayed that TPA-CPO could sense HSA with excellent properties including significant fluorescence enhancement, long emission wavelength, large stokes shift, and wide linear range. The recognition mechanism was proved that TPA-CPO could bind to domain IB of HSA and its TICT process was suppressed by utilizing hydrophobic cavity and low polarity of HSA. TPA-CPO bind to domain IB instead of common drug sites of HSA could effectively avoid interference from most drugs. The selective response of TPA-CPO allowed quantitative detection of HSA with sensitivity limit of 13.65 µg/mL. What's more, it successfully achieved HSA imaging in HeLa cells.
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Affiliation(s)
- Na Kang
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China
| | - Shizeng Pei
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China
| | - Caihong Zhang
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China.
| | - Guomei Zhang
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China
| | - Ying Zhou
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China
| | - Li Fan
- Institute of Environmental Science, Shanxi University, Taiyuan 030006, China
| | - QingJia Yao
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China
| | - Wen Wang
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China; Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China
| | - Shaomin Shuang
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China
| | - Chuan Dong
- Institute of Environmental Science, Shanxi University, Taiyuan 030006, China.
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Song BK, Light WR, Vandegriff KD, Tucker J, Nugent WH. Systemic and microvascular comparison of Lactated Ringer's solution, VIR-HBOC, and alpha-alpha crosslinked haemoglobin-based oxygen carrier in a rat 10% topload model. ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY 2020; 48:1079-1088. [PMID: 32820690 DOI: 10.1080/21691401.2020.1809441] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Medical support for traumatic haemorrhage is lacking for far-forward combat units. VIR-HBOC (haemoglobin-based oxygen carrier) is a novel biological therapeutic under development as a field-stable resuscitation fluid. HBOCs have a long history of complications, chief among them is vasoconstrictive hypertension, which must be resolved before efficacy testing. As such, VIR-HBOC was compared against Lactated Ringers (LRS; vehicle) and a cross-linked haemoglobin (ααHb; a known vasoactive HBOC) in a rat topload model. Twenty-three male, Sprague Dawley rats were randomly assigned to receive a 10% infusion (estimated total blood volume) of one test article while normotensive and under anaesthesia. Cardiovascular, blood chemistry and oximetry, microvascular arteriolar diameters, and interstitial tissue oxygenation parameters were measured. Circulatory half-life was calculated by plasma total haemoglobin. Treatment with ααHb caused immediate increases in mean arterial pressure compared to LRS and VIR-HBOC groups, and corresponding arteriolar vasoconstriction (p < .05), which did not occur for LRS or VIR-HBOC. Circulatory half-lives for VIR-HBOC and ααHb were calculated as 340 and 157 min, respectively. This first report of VIR-HBOC showed no evidence of a hypertensive or vasoactive effect. It was well-tolerated over the eight-hour time course of this topload model, which warrants further investigation in studies of haemorrhagic shock.
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Abstract
Supplemental Digital Content is available in the text Background: Hemorrhage and its complications are the leading cause of preventable death from trauma in young adults, especially in remote locations. To address this, deliverable, shelf-stable resuscitants that provide therapeutic benefits throughout the time course of hemorrhagic shock and the progressive ischemic injury it produces are needed. SANGUINATE∗ is a novel bovine PEGylated carboxyhemoglobin-based oxygen carrier, which has desirable oxygen-carrying and oncotic properties as well as a CO moiety to maintain microvascular perfusion. Objectives: To compare the crystalloid (Lactated Ringer's Solution; LRS), and the colloid (Hextend†) standards of care with SANGUINATE in a post “golden hour” resuscitation model. Methods: Rats underwent a controlled, stepwise blood withdrawal (45% by volume), were maintained in untreated hemorrhagic shock state for >60 min, resuscitated with a 20% bolus of one of the three test solutions, and observed till demise. Parameters of tissue oxygenation (PISFO2), arteriolar diameters, and mean arterial pressure (MAP) were collected. Results: SANGUINATE-treated animals survived significantly longer than those treated with Hextend and LRS. SANGUINATE also significantly increased tissue PISFO2 2 h after resuscitation, whereas LRS and Hextend did not. SANGUINATE also produced a significantly higher MAP, which was hypotensive compared to baseline, that endured until demise. Conclusions: Resuscitation with SANGUINATE after prolonged hemorrhagic shock improves survival, MAP, and PISFO2 compared with standard of care plasma expanders. Since the pathologies of hemorrhagic shock and the associated systemic ischemia are progressive, preclinical studies of this nature are essential to determine efficacy of new resuscitants across the range of possible times to treatment.
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Nugent WH, Carr DA, Macko AR, Song BK. Physiological and microvascular responses to hemoglobin concentration-targeted hemolytic anemia in rats. J Appl Physiol (1985) 2020; 128:1579-1586. [PMID: 32378976 DOI: 10.1152/japplphysiol.00767.2019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Hemolytic anemia (HA) is reduced blood oxygen-carrying capacity resulting from the depletion of red blood cells. Treatment for severe cases involves transfusion to improve oxygen delivery (Do2), which carries risk. In humans, a total hemoglobin (tHb) concentration of 8 g/dL is severe, and <7 g/dL indicates transfusion. Some evidence suggests that compensatory mechanisms maintaining Do2 are not compromised until <5 g/dL rendering transfusion at 7 g/dL premature. A Sprague-Dawley rat model of phenylhydrazine-induced HA was assessed over decreasing tHb for a Do2 decompensation point. Three groups (100, 50, or 25% tHb, equating to 16.4, 7.4, or 3.2 g/dL) were generated. Cardiopulmonary, blood chemistry, and oxygenation parameters were measured under anesthesia. Vasoconstrictive responsiveness to phenylephrine was assessed in the exteriorized spinotrapezius. For 50% tHb, cardiopulmonary parameters, Do2, and lactate levels were similar to those for 100% tHb. Enhanced vasoconstriction occurred with 50% tHb (P < 0.0001), not 25% tHb. The 25% group showed decreases in cardiopulmonary parameters, Do2, and lactate levels compared with the 100% and 50% groups (P < 0.05). Do2 showed a positive correlation with lactate levels at 25% tHb, but decompensation, defined by peripheral hypoxia, was not reached. This is the first study relating Do2 to tHb in rats. A 50% reduction in tHb was supported by vascular compensation, whereas 25% tHb levied the cardiopulmonary system. A decompensation point was not identified. A rising need for treatment as tHb levels decline below 8 g/dL is evident, but, as compensatory mechanisms remain intact as tHb approaches 3.2 g/dL in rats, a transfusion limit of 5 g/dL in healthy patients is supported.NEW & NOTEWORTHY Early, chronic compensation to severe hemolytic anemia is vascular, switching to cardiopulmonary support as hemoglobin levels decline. Oxygen delivery does not correlate with serum lactate level until total hemoglobin is reduced by 75%.
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Affiliation(s)
- William H Nugent
- Song Biotechnologies, Limited Liability Company, Baltimore, Maryland
| | - Danuel A Carr
- Song Biotechnologies, Limited Liability Company, Baltimore, Maryland
| | - Antoni R Macko
- Song Biotechnologies, Limited Liability Company, Baltimore, Maryland
| | - Bjorn K Song
- Song Biotechnologies, Limited Liability Company, Baltimore, Maryland
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Chu Z, Wang Y, You G, Wang Q, Ma N, Li B, Zhao L, Zhou H. The P50 value detected by the oxygenation-dissociation analyser and blood gas analyser. ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY 2020; 48:867-874. [DOI: 10.1080/21691401.2020.1770272] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Zongtang Chu
- Institute of Health Service and Transfusion Medicine, Academy of Military Medical Sciences, Academy of Military Science of the Chinese People’s Liberation Army, Beijing, P.R. China
| | - Ying Wang
- Institute of Health Service and Transfusion Medicine, Academy of Military Medical Sciences, Academy of Military Science of the Chinese People’s Liberation Army, Beijing, P.R. China
| | - Guoxing You
- Institute of Health Service and Transfusion Medicine, Academy of Military Medical Sciences, Academy of Military Science of the Chinese People’s Liberation Army, Beijing, P.R. China
| | - Quan Wang
- Institute of Health Service and Transfusion Medicine, Academy of Military Medical Sciences, Academy of Military Science of the Chinese People’s Liberation Army, Beijing, P.R. China
| | - Ning Ma
- Institute of Health Service and Transfusion Medicine, Academy of Military Medical Sciences, Academy of Military Science of the Chinese People’s Liberation Army, Beijing, P.R. China
| | - Bingting Li
- Institute of Health Service and Transfusion Medicine, Academy of Military Medical Sciences, Academy of Military Science of the Chinese People’s Liberation Army, Beijing, P.R. China
| | - Lian Zhao
- Institute of Health Service and Transfusion Medicine, Academy of Military Medical Sciences, Academy of Military Science of the Chinese People’s Liberation Army, Beijing, P.R. China
| | - Hong Zhou
- Institute of Health Service and Transfusion Medicine, Academy of Military Medical Sciences, Academy of Military Science of the Chinese People’s Liberation Army, Beijing, P.R. China
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Nugent WH, Jubin R, Buontempo PJ, Kazo F, Song BK. Microvascular and systemic responses to novel PEGylated carboxyhaemoglobin-based oxygen carrier in a rat model of vaso-occlusive crisis. ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY 2019; 47:95-103. [DOI: 10.1080/21691401.2018.1543197] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
| | - Ronald Jubin
- Prolong Pharmaceuticals, South Plainfield, NJ, USA
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Xu YJ, Su MM, Li HL, Liu QX, Xu C, Yang YS, Zhu HL. A fluorescent sensor for discrimination of HSA from BSA through selectivity evolution. Anal Chim Acta 2018; 1043:123-131. [DOI: 10.1016/j.aca.2018.09.010] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Revised: 09/03/2018] [Accepted: 09/05/2018] [Indexed: 01/20/2023]
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Hirai DM, Colburn TD, Craig JC, Hotta K, Kano Y, Musch TI, Poole DC. Skeletal muscle interstitial O 2 pressures: bridging the gap between the capillary and myocyte. Microcirculation 2018; 26:e12497. [PMID: 30120845 DOI: 10.1111/micc.12497] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Revised: 07/26/2018] [Accepted: 08/13/2018] [Indexed: 01/18/2023]
Abstract
The oxygen transport pathway from air to mitochondria involves a series of transfer steps within closely integrated systems (pulmonary, cardiovascular, and tissue metabolic). Small and finite O2 stores in most mammalian species require exquisitely controlled changes in O2 flux rates to support elevated ATP turnover. This is especially true for the contracting skeletal muscle where O2 requirements may increase two orders of magnitude above rest. This brief review focuses on the mechanistic bases for increased microvascular blood-myocyte O2 flux (V̇O2 ) from rest to contractions. Fick's law dictates that V̇O2 elevations driven by muscle contractions are produced by commensurate changes in driving force (ie, O2 pressure gradients; ΔPO2 ) and/or effective diffusing capacity (DO2 ). While previous evidence indicates that increased DO2 helps modulate contracting muscle O2 flux, up until recently the role of the dynamic ΔPO2 across the capillary wall was unknown. Recent phosphorescence quenching investigations of both microvascular and novel interstitial PO2 kinetics in health have resolved an important step in the O2 cascade between the capillary and myocyte. Specifically, the significant transmural ΔPO2 at rest was sustained (but not increased) during submaximal contractions. This supports the contention that the blood-myocyte interface provides a substantial effective resistance to O2 diffusion and underscores that modulations in erythrocyte hemodynamics and distribution (DO2 ) are crucial to preserve the driving force for O2 flux across the capillary wall (ΔPO2 ) during contractions. Investigation of the O2 transport pathway close to muscle mitochondria is key to identifying disease mechanisms and develop therapeutic approaches to ameliorate dysfunction and exercise intolerance.
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Affiliation(s)
- Daniel M Hirai
- Departments of Anatomy & Physiology, Kinesiology, Kansas State University, Manhattan, Kansas
| | - Trenton D Colburn
- Departments of Anatomy & Physiology, Kinesiology, Kansas State University, Manhattan, Kansas
| | - Jesse C Craig
- Departments of Anatomy & Physiology, Kinesiology, Kansas State University, Manhattan, Kansas
| | - Kazuki Hotta
- Department of Engineering Science, University of Electro-Communications, Tokyo, Japan
| | - Yutaka Kano
- Department of Engineering Science, University of Electro-Communications, Tokyo, Japan
| | - Timothy I Musch
- Departments of Anatomy & Physiology, Kinesiology, Kansas State University, Manhattan, Kansas
| | - David C Poole
- Departments of Anatomy & Physiology, Kinesiology, Kansas State University, Manhattan, Kansas
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Wang Y, Cui H, Niu F, Liu SL, Li Y, Zhang LM, Du HB, Zhao ZG, Niu CY. Effect of Resveratrol on Blood Rheological Properties in LPS-Challenged Rats. Front Physiol 2018; 9:1202. [PMID: 30210364 PMCID: PMC6123545 DOI: 10.3389/fphys.2018.01202] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Accepted: 08/10/2018] [Indexed: 11/13/2022] Open
Abstract
Objectives: Abnormal rheological properties induce adverse effects during sepsis. This study sought to investigate the hypothesis that resveratrol (Res) improves blood rheological properties in rats following a lipopolysaccharide (LPS) challenge, and provide a novel approach for treatment of sepsis. Methods: The rats were intraperitoneally or intramuscularly injected with vehicle, LPS (8 mg/kg), Res (30 mg/kg), or both to yield four groups: control, Res, LPS, and LPS + Res. After 6 h of LPS and/or Res injection, the mean arterial pressure (MAP), regional blood flow, erythrocyte and leukocyte parameters, and blood viscosity were observed. Results: LPS administration had no significant effects on the erythrocyte parameters and plasma viscosity. LPS administration reduced the MAP, whole blood viscosity at low and medium shear rates, the blood flow in the spleen and kidney, and the leukocyte content in whole blood when compared to control group, and increased the myeloperoxidase (MPO) activity in lung. Treatment with Res alone had no effects on most of parameters observed except increasing the whole blood relative viscosity. However, Res treatment after LPS resulted in further decrease in whole blood viscosity at high and medium shear rates. Furthermore, Res treatment conversely decreased the red blood cell distribution width-CV, blood flow of stomach, whole blood relative viscosity and MPO activity in lung, and increased the leukocyte content, but did not restore LPS-induced decrease in MAP and the blood flow in the spleen and kidney. Conclusion: The Res treatment partly reduce the whole blood viscosity and regional blood flow, and increase WBC content in peripheral blood following the LPS challenge, suggesting a favorable role in expanding the quasi-sympathetic effects of LPS in blood viscosity at early stages.
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Affiliation(s)
- Ying Wang
- Institute of Microcirculation, Hebei North University, Zhangjiakou, China.,First Affiliated Hospital, Hebei North University, Zhangjiakou, China
| | - Hao Cui
- Institute of Microcirculation, Hebei North University, Zhangjiakou, China
| | - Fei Niu
- Institute of Microcirculation, Hebei North University, Zhangjiakou, China
| | - Shuo-Lin Liu
- Institute of Microcirculation, Hebei North University, Zhangjiakou, China
| | - Yao Li
- Institute of Microcirculation, Hebei North University, Zhangjiakou, China
| | - Li-Min Zhang
- Institute of Microcirculation, Hebei North University, Zhangjiakou, China
| | - Hui-Bo Du
- Institute of Microcirculation, Hebei North University, Zhangjiakou, China
| | - Zi-Gang Zhao
- Institute of Microcirculation, Hebei North University, Zhangjiakou, China
| | - Chun-Yu Niu
- Institute of Microcirculation, Hebei North University, Zhangjiakou, China
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Zhao J, Yan C, Xu L, Yan K, Feng B, Zhao M, Niu G, Wu M, Chen C, Zhu H. The effect of pPolyHb on hemodynamic stability and mesenteric microcirculation in a rat model of hemorrhagic shock. ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY 2017; 45:677-685. [PMID: 28129711 DOI: 10.1080/21691401.2017.1282869] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
The effects of polymerized porcine hemoglobin (pPolyHb) on hemodynamic stability and maintenance of mesenteric microvascular function were explored in a rat model of hemorrhagic shock (HS). Following controlled hemorrhage, rats were infused with equal volumes of either pPolyHb, hetastarch (HES), or red blood cell (RBC). The results showed that pPolyHb was superior to HES and RBC in restoring hemodynamic stability and reversing anaerobic metabolism. We observed a reduction in the diameter of mesenteric microvasculature after HS. Resuscitation with pPolyHb and RBC was able to restore the diameters of the venules and arterioles, whereas HES failed to restore the diameters during the observation period.
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Affiliation(s)
- Jing Zhao
- a College of Life Science, Northwest University , Xi'an , P. R. China.,d Department of Anesthesiology , Xijing Hospital, Fourth Military Medical University , Xi'an , P. R. China
| | - Chengbin Yan
- a College of Life Science, Northwest University , Xi'an , P. R. China
| | - Lijuan Xu
- a College of Life Science, Northwest University , Xi'an , P. R. China
| | - Kunping Yan
- a College of Life Science, Northwest University , Xi'an , P. R. China
| | - Bao Feng
- c Shaanxi Lifegen Co. Ltd , Xi'an , P. R. China
| | - Mengye Zhao
- a College of Life Science, Northwest University , Xi'an , P. R. China
| | - Geng Niu
- a College of Life Science, Northwest University , Xi'an , P. R. China
| | - Mengdi Wu
- a College of Life Science, Northwest University , Xi'an , P. R. China
| | - Chao Chen
- a College of Life Science, Northwest University , Xi'an , P. R. China.,b National Engineering Research Center for Miniaturized Detection Systems, Northwest University , Xi'an , P. R. China
| | - Hongli Zhu
- a College of Life Science, Northwest University , Xi'an , P. R. China.,b National Engineering Research Center for Miniaturized Detection Systems, Northwest University , Xi'an , P. R. China
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Nugent WH, Song BK, Pittman RN, Golub AS. Simultaneous sampling of tissue oxygenation and oxygen consumption in skeletal muscle. Microvasc Res 2015; 105:15-22. [PMID: 26683232 DOI: 10.1016/j.mvr.2015.12.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Revised: 12/08/2015] [Accepted: 12/08/2015] [Indexed: 01/07/2023]
Abstract
Under physiologic conditions, microvascular oxygen delivery appears to be well matched to oxygen consumption in respiring tissues. We present a technique to measure interstitial oxygen tension (PISFO2) and oxygen consumption (VO2) under steady-state conditions, as well as during the transitions from rest to activity and back. Phosphorescence Quenching Microscopy (PQM) was employed with pneumatic compression cycling to achieve 1 to 10 Hz sampling rates of interstitial PO2 and simultaneous recurrent sampling of VO2 (3/min) in the exteriorized rat spinotrapezius muscle. The compression pressure was optimized to 120-130 mmHg without adverse effect on the tissue preparation. A cycle of 5s compression followed by 15s recovery yielded a resting VO2 of 0.98 ± 0.03 ml O2/100 cm(3)min while preserving microvascular oxygen delivery. The measurement system was then used to assess VO2 dependence on PISFO2 at rest and further tested under conditions of isometric muscle contraction to demonstrate a robust ability to monitor the on-kinetics of tissue respiration and the compensatory changes in PISFO2 during contraction and recovery. The temporal and spatial resolution of this approach is well suited to studies seeking to characterize microvascular oxygen supply and demand in thin tissues.
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Affiliation(s)
- William H Nugent
- Department of Physiology and Biophysics, Medical College of Virginia Campus, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Bjorn K Song
- Department of Physiology and Biophysics, Medical College of Virginia Campus, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Roland N Pittman
- Department of Physiology and Biophysics, Medical College of Virginia Campus, Virginia Commonwealth University, Richmond, VA 23298, USA.
| | - Aleksander S Golub
- Department of Physiology and Biophysics, Medical College of Virginia Campus, Virginia Commonwealth University, Richmond, VA 23298, USA
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Chen G, Mo L, Lin F, Zhang X, Liu J, Wang H, Yang C. Development, validation and application of an HPLC method for reduced vitamin C qualification in HBOCs solution. ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY 2015; 44:456-61. [DOI: 10.3109/21691401.2015.1115412] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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