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Mbaye F, Cisse M, Thiam K, Ka W, Ndao M, Niang S, Toure N, Dia Kane Y. Évaluation de la qualité de vie chez 112 patients tuberculeux suivis dans le service de pneumologie du CHNU de Fann de Dakar. Rev Mal Respir 2019. [DOI: 10.1016/j.rmr.2018.10.599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Ndao M, Thiam K, Mbaye F, Sagne J, Dia S, Ka W, Dia Y, Toure Badiane N. Pollution atmosphérique dans la région de Dakar de 2011 à 2016 : corrélation avec la prévalence des manifestations respiratoires. Rev Mal Respir 2019. [DOI: 10.1016/j.rmr.2018.10.278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Thiam K, Ndiaye E, Cissé M, Mbaye F, Niang S, Sagne J, Dia S, Ndao M, Ka W, Ka T, Soumare P, Diatta A, Dia Kane Y, Touré N, Fall M. Manifestations respiratoires basses associées à la pratique de la teinture artisanale des vêtements à Dakar (Sénégal). Rev Mal Respir 2019. [DOI: 10.1016/j.rmr.2018.10.282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Thiam K, Dia Kane Y, Diatta A, Ndiaye E, Cissé M, Mbaye F, Sagne J, Dia S, Ndao M, Ka W, Ka T, Soumaré P, Touré N. Évaluation de l’impact de l’école de l’asthme chez les asthmatiques suivis au service de pneumo-phtisiologue du CHNU de Fann. Rev Mal Respir 2019. [DOI: 10.1016/j.rmr.2018.10.394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Dia S, Thiam K, Cisse Sarr M, Toure Badiane N, Niang A, Mbaye F, Sagne J, Ndao M, Ka W, Dia Kane Y, Ka T, Soumare P. Profil épidémiologique, clinique, paraclinique, étiologique et évolutif des pneumopathies infiltratives diffuses chroniques. Rev Mal Respir 2019. [DOI: 10.1016/j.rmr.2018.10.520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Kombila UD, Ka W, Mbaye FBR, Diouf NF, Fall L, Ouedraogo P, Koutonin ANE, Dia Kane Y, Oumar Toure Badiane N. [DRESS syndrome secondary to pyrazinamide: An uncommon complication of tuberculosis treatment]. Rev Mal Respir 2018; 35:69-73. [PMID: 29429561 DOI: 10.1016/j.rmr.2017.02.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Accepted: 02/17/2017] [Indexed: 11/15/2022]
Abstract
INTRODUCTION The Drug Reaction with Eosinophilia and Systemic Symptom (DRESS) is a severe drug-induced reaction. CASE REPORT We report the case of a 35-year-old man treated by RHEZ for a first episode of a smear positive pulmonary tuberculosis and who developed a DRESS syndrome due to pyrazinamide after twenty days of treatment, associated with a viral reactivation to Human Herpes Virus 6 (HHV6). He had a skin eruption, liver involvement and hypereosinophilia. He fully recovered after drug withdrawal, associated with local and general corticosteroids. He died two weeks after discharge. CONCLUSIONS Discovery of DRESS syndrome during tuberculosis treatment is an uncommon complication and requires a searching for the responsible drug. That should be difficult because tuberculosis drugs are often given as fixed-dose combination. Physicians have to bear in mind the potential role of pyrazinamide.
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Affiliation(s)
- U D Kombila
- Service de médecine interne, centre hospitalier universitaire de Libreville (CHUL), BP 9264, Libreville, Gabon; Clinique de pneumologie, centre hospitalier national universitaire de FANN (CHNUF), avenue Cheikh-ANTA-DIOP, BP 5035, Dakar, Sénégal.
| | - W Ka
- Clinique de pneumologie, centre hospitalier national universitaire de FANN (CHNUF), avenue Cheikh-ANTA-DIOP, BP 5035, Dakar, Sénégal
| | - F B R Mbaye
- Clinique de pneumologie, centre hospitalier national universitaire de FANN (CHNUF), avenue Cheikh-ANTA-DIOP, BP 5035, Dakar, Sénégal
| | - N F Diouf
- Clinique de pneumologie, centre hospitalier national universitaire de FANN (CHNUF), avenue Cheikh-ANTA-DIOP, BP 5035, Dakar, Sénégal
| | - L Fall
- Service de dermatologie, léprologie, centre hospitalier de l'Ordre-de-Malte, avenue Cheikh-ANTA-DIOP, BP 5035, Dakar, Sénégal
| | - P Ouedraogo
- Clinique de pneumologie, centre hospitalier national universitaire de FANN (CHNUF), avenue Cheikh-ANTA-DIOP, BP 5035, Dakar, Sénégal
| | - A N E Koutonin
- Clinique de pneumologie, centre hospitalier national universitaire de FANN (CHNUF), avenue Cheikh-ANTA-DIOP, BP 5035, Dakar, Sénégal
| | - Y Dia Kane
- Clinique de pneumologie, centre hospitalier national universitaire de FANN (CHNUF), avenue Cheikh-ANTA-DIOP, BP 5035, Dakar, Sénégal
| | - N Oumar Toure Badiane
- Clinique de pneumologie, centre hospitalier national universitaire de FANN (CHNUF), avenue Cheikh-ANTA-DIOP, BP 5035, Dakar, Sénégal
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Ndao M, Thiam K, Mbaye F, Sarr M, Sagne J, Dia S, Ka W, Mbow A, Kane YD, Badiane NT. Prévalence de certaines manifestations respiratoires dans la région de Dakar : corrélation avec le niveau de particule en suspension fine inférieur à 10 μm (PM10). Rev Mal Respir 2018. [DOI: 10.1016/j.rmr.2017.10.536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Thiam K, Touré N, Kane YD, Ndiaye E, Cissé M, Diatta A, Niang S, Sagne J, Dia S, Ndao M, Ka W. Epidémiologie des cancers bronchopulmonaires primitifs des non-fumeurs au Sénégal. Rev Mal Respir 2018. [DOI: 10.1016/j.rmr.2017.10.539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Mbaye FBR, Kane YD, Thiam K, Touré NO, Ndiaye EHM, Dia S, Sagne JMAN, Ndao M, Ka W. Les facteurs de risque de mortalité des infections respiratoires basses non tuberculeuses chez les patients vivant avec le vih (PVVIH) aux services des maladies infectieuses et de pneumologie de Fann. Rev Mal Respir 2018. [DOI: 10.1016/j.rmr.2017.10.579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Dia Kane Y, Cissé M, Diatta A, Touré N, Thiam K, M’baye F, N’Diaye E, Sagne J, Mama N, Dia S, Ka W. Profil épidémiologique, clinique, paraclinique des patients tuberculeux hospitalisés et décédés au service de pneumophtisiologie du CHNU Fann Dakar. Rev Mal Respir 2017. [DOI: 10.1016/j.rmr.2016.10.541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Mbaye FBR, Thiam K, Touré Badiane NO, Dia Kane Y, Diatta A, Ndiaye EHM, Cissé MF, Niang S, Sagne JMAN, Dia S, Ndao M, Ka W. Apport des prélèvements per-fibroscopiques (lavage broncho-alvéolaire (LBA)/aspiration bronchique/biopsies bronchiques) dans le diagnostic des cancers bronchiques primitifs au CHNU de Fann de Dakar. Rev Mal Respir 2017. [DOI: 10.1016/j.rmr.2016.10.188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Mbaye F, Thiam K, Dia Kane Y, Touré Badiane N, Diatta A, Ndiaye E, Cissé M, Niang S, Sagne J, Dia S, Ndao M, Ka W. Infections opportunistes à localisation pulmonaire chez les patients vivant avec le VIH (PvVIH) au service des maladies infectieuses du CHNU de Fann. Rev Mal Respir 2017. [DOI: 10.1016/j.rmr.2016.10.549] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Thiam K, Mbaye F, Touré Badiane N, Dia Kane Y, Diatta A, Ndiaye E, Cissé M, Niang S, Sagne J, Dia S, Ndao M, Ka W. Performance du GenXpert selon le type de prélèvements pulmonaires. Rev Mal Respir 2017. [DOI: 10.1016/j.rmr.2016.10.738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Thiam K, Touré Badiane N, Ndiaye E, Mbaye F, Dia Kane Y, Diatta A, Cissé M, Niang S, Sagne J, Dia S, Ndao M, Ka W. Miliaire tuberculeuse dans le service de pneumologie du CHNU de Fann, Dakar (Sénégal) : à propos de 51 cas. Rev Mal Respir 2017. [DOI: 10.1016/j.rmr.2016.10.550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Dia Kane Y, Touré NO, Diatta A, Thiam K, Cissé M, M’baye F, N’Diaye E, Sagne J, N’Dao M, Dia S, Ka W. Prise en charge de l’asthme à l’officine : enquêtes auprès de pharmaciens d’officine dans le département de Dakar. Rev Mal Respir 2017. [DOI: 10.1016/j.rmr.2016.10.631] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Mu W, Wang X, Zhang X, Zhu S, Sun D, Ka W, Sung LA, Yao W. Fluid Shear Stress Upregulates E-Tmod41 via miR-23b-3p and Contributes to F-Actin Cytoskeleton Remodeling during Erythropoiesis. PLoS One 2015; 10:e0136607. [PMID: 26308647 PMCID: PMC4550387 DOI: 10.1371/journal.pone.0136607] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2015] [Accepted: 08/06/2015] [Indexed: 11/22/2022] Open
Abstract
The membrane skeleton of mature erythrocyte is formed during erythroid differentiation. Fluid shear stress is one of the main factors that promote embryonic hematopoiesis, however, its effects on erythroid differentiation and cytoskeleton remodeling are unclear. Erythrocyte tropomodulin of 41 kDa (E-Tmod41) caps the pointed end of actin filament (F-actin) and is critical for the formation of hexagonal topology of erythrocyte membrane skeleton. Our study focused on the regulation of E-Tmod41 and its role in F-actin cytoskeleton remodeling during erythroid differentiation induced by fluid shear stress. Mouse erythroleukemia (MEL) cells and embryonic erythroblasts were subjected to fluid shear stress (5 dyn/cm2) and erythroid differentiation was induced in both cells. F-actin content and E-Tmod41 expression were significantly increased in MEL cells after shearing. E-Tmod41 overexpression resulted in a significant increase in F-actin content, while the knockdown of E-Tmod41 generated the opposite result. An E-Tmod 3’UTR targeting miRNA, miR-23b-3p, was found suppressed by shear stress. When miR-23b-3p level was overexpressed / inhibited, both E-Tmod41 protein level and F-actin content were reduced / augmented. Furthermore, among the two alternative promoters of E-Tmod, PE0 (upstream of exon 0), which mainly drives the expression of E-Tmod41, was found activated by shear stress. In conclusion, our results suggest that fluid shear stress could induce erythroid differentiation and F-actin cytoskeleton remodeling. It upregulates E-Tmod41 expression through miR-23b-3p suppression and PE0 promoter activation, which, in turn, contributes to F-actin cytoskeleton remodeling.
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Affiliation(s)
- Weiyun Mu
- Hemorheology Center, Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, 100191, China
| | - Xifu Wang
- Department of Emergency, Beijing Anzhen hospital, Capital Medical University, Beijing, 100029, China
| | - Xiaolan Zhang
- Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Sida Zhu
- Hemorheology Center, Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, 100191, China
| | - Dagong Sun
- Hemorheology Center, Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, 100191, China
| | - Weibo Ka
- Hemorheology Center, Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, 100191, China
| | - Lanping Amy Sung
- Department of Bioengineering, University of California, San Diego, La Jolla, CA 92093, United States of America
| | - Weijuan Yao
- Hemorheology Center, Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, 100191, China
- * E-mail:
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Song J, Wang X, Xu X, Jia B, Zheng Q, Ka W, Sun D, Wen Z, Xie L, Yao W. The effects of non-ionic contrast medium on the hemorheology in vitro and in vivo. Clin Hemorheol Microcirc 2015; 58:385-93. [PMID: 23271204 DOI: 10.3233/ch-121669] [Citation(s) in RCA: 5] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Contrast media are the commonly used agents in radiology. However, because of their characteristics of high osmolality, high viscosity, and chemical toxicity, the administrations of contrast media have been shown to cause adverse effects especially on hemorheology in short time course. The present study is to find the effects of a non-ionic contrast medium, iopromide, on the hemorheology in long time course both in vitro and in vivo. For in vitro treatment, human peripheral blood samples were incubated with contrast medium at 37°C for 0.5, 1 and 2 h. For in vivo study, about 15 ml of contrast medium was injected into rabbits and blood samples were collected at 0.5, 2, 6, and 24 h after the bolus injection. Hemorheological parameters were examined. Results showed that hematocrit adjusted whole blood viscosity increased significantly at 1 h after in vitro treatment of contrast medium, while it decreased at 0.5 h and remained low till 6 h after bolus injection. Ektacytometer showed that erythrocyte deformability decreased to the lowest level at 2 h in vitro and it dropped at 0.5 h and resumed to normal after 2 h in vivo. Erythrocyte small deformation indices were reduced by contrast medium in both in vitro and in vivo studies. Erythrocyte orientation index was also reduced in in vivo study. Erythrocyte electrophoresis rates at all time points decreased but osmotic fragility did not change in both studies. These impaired hemorheological parameters may disturb the microcirculation and cause adverse effects in patients with kidney diseases.
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Affiliation(s)
- Jian Song
- Chengde Medical College, Chengde, Hebei Province, China
| | - Xifu Wang
- Emergency Department, Beijing Anzhen Hospital, Capital Medical University, Beijing, China
| | - Xiaoli Xu
- Guiyang Medical College, Guiyang, Guizhou Province, China
| | - Binbin Jia
- Department of Clinical Laboraotory, First Central Hospital of Baoding, Baoding, Hebei Province, China
| | - Qinni Zheng
- Guiyang Medical College, Guiyang, Guizhou Province, China
| | - Weibo Ka
- Hemorheology Center, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, China
| | - Dagong Sun
- Hemorheology Center, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, China
| | - Zongyao Wen
- Hemorheology Center, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, China
| | - Lide Xie
- Chengde Medical College, Chengde, Hebei Province, China
| | - Weijuan Yao
- Hemorheology Center, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, China
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Wang X, Chen D, Zhang X, Jia B, Xie L, Sun D, Ka W, Yao W, Wen ZY. Biorheological changes of dendritic cells at the different differentiation stages. Clin Hemorheol Microcirc 2011; 46:265-73. [PMID: 21187575 DOI: 10.3233/ch-2010-1334] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The differentiation, maturation and functioning of Dendritic cells (DCs) are dynamic processes. This study investigated the changes of DCs' migration ability and biorheological properties during their differentiation. Transmigration assay showed that, DCs' migration rate was improved significantly as they differentiate (p < 0.05); NSC (Rac1 blocker) treatment could significantly decrease their migration rates (p < 0.05). Confocal images showed that, F-actin uniformly distributed in monocytes; with DC's differentiation, F-actin began to remodel and gather at the site of dendrites; the images presented surface ruffles and uneven sawtooth-like cytoskeletal structures. Fluorescence polarization analysis showed that, membrane fluidity was increased significantly with DC's differentiation (p < 0.05). CD62L was upregulated significantly (p < 0.05) on the third and ninth days. CD2 was upregulated significantly (p < 0.05) until the seventh day. DC's electrophoretic mobility was increased continuously, especially increased significantly from the third day to the fifth day and the final stage (p < 0.05). These results indicate that there are significant changes in the biorheological properties of DCs during their differentiation.
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Affiliation(s)
- Xianwei Wang
- Health Science Center, Department of Biophysics, Peking University, Beijing, China
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Xu X, Zeng Z, Yao W, Wang X, Sun D, Ka W, Zhang Y, Wang X, Chen X, Zha Y, Sun L, Xie L, Wen Z, Chien S. Biomechanical alterations of dendritic cells by co-culturing with K562 CML cells and their potential role in immune escape. J Biomech 2010; 43:2339-47. [DOI: 10.1016/j.jbiomech.2010.04.028] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2010] [Revised: 04/22/2010] [Accepted: 04/22/2010] [Indexed: 10/19/2022]
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Zhang X, Yao W, Jia B, Sun D, Ka W, He D, Wang X, Wen Z. Acute dichlorvos poisoning induces hemorheological abnormalities in rabbits via oxidative stress. Clin Hemorheol Microcirc 2010; 44:207-16. [DOI: 10.3233/ch-2010-1264] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- Xiaolan Zhang
- Hemorheology Center, Department of Biophysics, Peking University Health Science Center, Beijing, China
| | - Weijuan Yao
- Hemorheology Center, Department of Biophysics, Peking University Health Science Center, Beijing, China
| | - Binbin Jia
- Chengde Medical College, Chengde, Hebei Province, China
| | - Dagong Sun
- Hemorheology Center, Department of Biophysics, Peking University Health Science Center, Beijing, China
| | - Weibo Ka
- Hemorheology Center, Department of Biophysics, Peking University Health Science Center, Beijing, China
| | - Dongqi He
- Hemorheology Center, Department of Biophysics, Peking University Health Science Center, Beijing, China
| | - Xifu Wang
- Department of Cardiology, Peking University Shougang Hospital, Beijing, China
| | - Zongyao Wen
- Hemorheology Center, Department of Biophysics, Peking University Health Science Center, Beijing, China
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Wang X, Chen X, Tang Z, Yao W, Liu X, Wei R, Wang X, Ka W, Sun D, He D, Wen Z, Chien S. Ryanodine receptor 1 mediates Ca2+ transport and influences the biomechanical properties in RBCs. J Biomech 2009; 42:2774-9. [DOI: 10.1016/j.jbiomech.2009.07.036] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2009] [Revised: 07/27/2009] [Accepted: 07/29/2009] [Indexed: 10/20/2022]
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Wang J, Tang ZY, Ka W, Sun D, Yao W, Wen Z, Chien S. Synergistic effect of cytokines EPO, IL-3 and SCF on the proliferation, differentiation and apoptosis of erythroid progenitor cells. Clin Hemorheol Microcirc 2007; 37:291-299. [PMID: 17942981] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Erythroblasts were obtained from murine spleen. After cultured for 12 hr, the cells were divided into four groups with the use of the following cytokines in culture: EPO, EPO+SCF, EPO+IL-3, and EPO+IL-3+SCF. Cell proliferation assay was done. Apoptosis rates were obtained by using a flow cytometer. Mitochondrial membrane potential (MMP) was assessed in flow cytometry (FCM) by labeling with rhodamine 123. Mitochondrial enzyme activity (MEA) was evaluated with MTT colorimetric assay. The cells were labeled with Fluo-3/Am Ester and Ca(2+) concentration was measured. The expression of Bax mRNA and Bcl-2 mRNA was analyzed by RT-PCR. At same time, the expression of Bax and Bcl-2 was analyzed by western blotting. Our results showed that IL-3 and SCF have synergistic effects with EPO on the proliferation, differentiation and apoptosis of erythroid progenitors.
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Affiliation(s)
- Jinhua Wang
- Hemorheology Center, Department of Biophysics, School of Basic Medical Sciences, Peking University, Beijing 100083, China
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Zeng Z, Xu X, Zhang Y, Xing J, Long J, Gu L, Wang X, Sun D, Ka W, Yao W, Wen Z, Chien S. Tumor-derived factors impaired motility and immune functions of dendritic cells through derangement of biophysical characteristics and reorganization of cytoskeleton. ACTA ACUST UNITED AC 2007; 64:186-98. [PMID: 17183544 DOI: 10.1002/cm.20175] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The generation and progress of tumors are accompanied with a marked suppression of human immune system. To explore the mechanisms by which tumors escape from immune recognition, we studied the influences of tumor microenvironment on differentiation of dendritic cells (DCs), which play an important role in tumor immunology, by biophysical and immunological methods. It was found that the cytokines derived from tumors caused an increase in osmotic fragility and a decrease in membrane fluidity of DCs, disordering and elevated expression levels of cytoskeleton, and changes of the gene transcriptional levels and energy status of the cells. Moreover, IL-12 production and the expression levels of some surface-marker molecules were also suppressed. These changes led to impaired capabilities of antigen uptake, cell motility and naïve T cell activation; the abnormal biophysical characteristics of DCs may be one aspect of the immune escape mechanism of tumor. These results provide insights into the importance of the reconstruction of tumor microenvironment for immunotherapy based on the anti-cancer activities of DCs.
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Affiliation(s)
- Zhu Zeng
- Department of Biophysics, Health Science Center, Peking University, Beijing, People's Republic of China
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Zhang Y, Yao W, Zeng Z, Wang X, Sun D, Ka W, Zhou S, He D, Wen Z, Chien S. Exogenous Wild-Type p53 Gene Improved Survival of Nude Mice Injected with Murine Erythroleukemia Cell Line Through Amelioration of Hemorheological Changes. Microcirculation 2007; 14:155-66. [PMID: 17365670 DOI: 10.1080/10739680601139104] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
OBJECTIVES Previous investigations have shown that human wild-type p53 gene (WTp53) inhibits the growth of leukemia and tumor cells in vitro. In the present study, the authors used nude mice and examined the therapeutic role of p53 gene for erythroleukemia in vivo in the absence of MHC effects. METHODS The nude mice were injected with murine erythroleukemia cells (MEL), MEL cells transfected with wild-type p53 gene (MEL-W), and MEL cells transfected with mutated p53 gene (MEL-M). Abnormalities were found in the hemorheological and biophysical properties of red blood cells in all 3 groups of animals, but the abnormalities were lesser in degree and later in appearance in MEL-W group than in MEL and MEL-M groups. Furthermore, the nude mice in MEL-W group lived longer than those in MEL and MEL-M groups. RESULTS The results showed that WTp53 restrained the growth of erythroleukemia cells in vivo and reduced the erythroleukemia tumorigenesis in the microcirculation by improving the hemorheological and biophysical properties of MEL cells, which helped to prolong the life span of nude mice suffering from erythroleukemia. CONCLUSION These results contribute to our knowledge on the use of wild-type p53 gene for the treatment of erythroleukemia disease.
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Affiliation(s)
- Yingyu Zhang
- Department of Biophysics, Health Science Center, Peking University, Beijing, People's Republic of China
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25
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Zeng Z, Liu X, Jiang Y, Wang G, Zhan J, Guo J, Yao W, Sun D, Ka W, Tang Y, Tang J, Wen Z, Chien S. Biophysical studies on the differentiation of human CD14+ monocytes into dendritic cells. Cell Biochem Biophys 2006; 45:19-30. [PMID: 16679561 DOI: 10.1385/cbb:45:1:19] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/1999] [Revised: 11/30/1999] [Accepted: 11/30/1999] [Indexed: 11/11/2022]
Abstract
Dendritic cells (DCs), which are the most efficient antigen-presenting cells (APCs) currently known, can be derived from CD14+ monocytes (DC predecessor cells) in vitro. Immature DCs actively take up antigens and pathogens, generate major histocompatability complex-peptide complexes, and migrate from the sites of antigen acquisition to secondary lymphoid organs to become mature dendritic cells that interact with and stimulate T-lymphocytes. During this process, the cells must undergo deformation to translocate through several barriers, including the basement membrane and interstitial connective tissue in the blood vessel wall. To further understand the mechanisms of the activation of immunological responses and the migration from peripheral tissue to secondary lymphoid organs, we have applied biophysical and microrheological methods to study the development processes of DCs in vitro. The results showed that membrane fluidity, osmotic fragility, membrane viscoelastic properties, infrared spectroscopy, and cytoskeleton organization of DCs exhibit significant differences in different developmental stages.
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Affiliation(s)
- Zhu Zeng
- Department of Biophysics, Health Science Center, Peking University, Beijing, People's Republic of China
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26
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Xie L, Jiang Y, Yao W, Gu L, Sun D, Ka W, Wen Z, Chien S. Studies on the biomechanical properties of maturing reticulocytes. J Biomech 2006; 39:530-5. [PMID: 16389093 DOI: 10.1016/j.jbiomech.2004.11.032] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2003] [Accepted: 11/26/2004] [Indexed: 11/23/2022]
Abstract
We investigated the biomechanical properties of reticulocytes obtained from an animal model of hemolytic anemia induced by antibody injection. The hemorheological indices, membrane viscoelasticity, membrane fluidity, and the secondary structure of membrane proteins of the reticulocytes were monitored continuously during the course of their maturation into erythrocytes. The results indicate that reticulocytes had lower deformability, lower membrane fluidity, greater viscoelastic modulus and lesser proportions of alpha-helices and beta-sheets in protein secondary structures than mature erythrocytes. All these indices approached to the level of normal erythrocytes when reticulocytes transformed during maturation. The results help to enhance our understanding of the biomechanical properties of the reticulocytes in their maturing process with clinical diagnosis significances.
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Affiliation(s)
- Lide Xie
- Hemorheology Center, Department of Biophysics, Peking University Health Science Center, Beijing 100083, PR China
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27
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Wang J, Ka W, Sun D, Yao W, Wen Z, Chien S. Biochemical and Biophysical Studies on the Precursor Cells of Mouse Erythrocytes at Different Stages. Cell Biochem Biophys 2006; 45:147-56. [PMID: 16757815 DOI: 10.1385/cbb:45:2:147] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/1999] [Revised: 11/30/1999] [Accepted: 11/30/1999] [Indexed: 11/11/2022]
Abstract
The aim of this research is to study the biochemical and biophysical properties of the precursor cells of mouse erythrocytes at different stages and the molecular mechanisms of their regulation. We investigated the degree of terminal differentiation of splenic erythroblasts obtained from mice during the acute phase of disease caused by the anemia-inducing FVAstrain of Friend virus. We analyzed the transcription and protein levels of alpha-globin, beta-globin (erythroid special protein) and GATA-1 (a special erythroid transcription factor). We also have examined the Ca2+ concentration, the distribution and amount of F-actin, important cellular components such as nucleic acids, lipids, and proteins, and the adhesion of precursor cells of RBC at different stages to vascular endothelium. Our results indicated that Ca2+ concentration and the distribution and structure of F-actin changed with the development of proerythroblasts, and that the adhesion rate between the precursor cells and endothelial cells can be correlated with the expression levels of ICAM-1 and P-selectin. These alternations caused changes in biophysical properties of the cell, such as membrane fluidity and deformability.
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Affiliation(s)
- Jinhua Wang
- Institute of Materia Medica, Chinese Academy of Medical Science & Peking Union Medical College, Beijing 100050, USA
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28
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Jiang Y, Chen K, Tang Z, Zeng Z, Yao W, Sun D, Ka W, He D, Wen Z, Chien S. TRAIL gene reorganizes the cytoskeleton and decreases the motility of human leukemic Jurkat cells. ACTA ACUST UNITED AC 2006; 63:471-82. [PMID: 16767747 DOI: 10.1002/cm.20138] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
TRAIL can selectively induce rapid apoptosis of various types of tumor cells. We induced the expression of TRAIL in Jurkat cells, and measured the adhesion of cells to human umbilical vein endothelial cells (HUVECs) and laminin (LN) in a parallel plate flow chamber system and by using a colorimetric method. The apoptosis percentage, cycle distribution, intracellular Ca(2+) concentration, and adhesion molecule expression of the cells were detected by flow cytometry. Cytoskeleton was observed with a laser confocal microscopy. The roles of adhesion molecules in the cell interaction was defined by their function blocking. The results showed that TRAIL attenuated the adhesion of Jurkat cells to HUVECs and LN, as well as their transendothelial migration. The increased apoptosis and G1-phase cell percentages, decreased intracellular Ca(2+) concentration, depolymerized actin and impaired cell deformability could contribute to the decreased adhesion of Jurkat cells caused by TRAIL. Furthermore, CD11a was found to play a more important role than CD62L in the adhesion of Jurkat cells to HUVECs. These findings contribute to the knowledge on the role of TRAIL in tumor metastasis and provide mechanistic basis for the clinical application of TRAIL and tumor therapy.
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Affiliation(s)
- Yuhui Jiang
- Department of Biophysics, Health Science Center, Peking University, Beijing, People's Republic of China
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29
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Gu L, Jiang Y, Wang Y, Yao W, Sun D, Ka W, Tang Z, Xu X, Wen Z, Chien S. TFAR19 Gene Changes the Biophysical Properties of Murine Erythroleukemia Cells. Cell Biochem Biophys 2005; 43:355-63. [PMID: 16247177 DOI: 10.1385/cbb:43:3:355] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
TFAR19 is a novel apoptosis-related gene and can accelerate cell apoptosis in the presence of apoptosis inducements. Here, we studied the effects of TFAR19 on some biophysical properties of mouse erythroleukemia (MEL) cells and their molecular and structural basis. After transfected with TFAR19 and apoptosis inducement, MEL revealed a high cell membrane fluidity, a decrease in resynthesis of phospholipids, an increase in the proteins/nucleic acids ratio, a relatively orderly cytoskeleton network, an impaired deformability, a low integrin aM expression, and a decrease in adhesion to endothelial cells. These findings suggest the potential of TFAR19 for antitumor cell migration, and thus for antitumor gene therapy.
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Affiliation(s)
- Li Gu
- Department of Biophysics, Health Science Center, Peking University, Beijing 100083, P. R. China
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30
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Guo J, Zhang L, Jiang Y, Zeng Z, Sun D, Ka W, Zheng J, Guo Z, Wen Z. Effects of Compound Dan-shen Root Dropping Pill on hemorheology in high-fat diet induced hyperlipidemia in dogs. Clin Hemorheol Microcirc 2005; 32:19-30. [PMID: 15665423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
Abstract
The purpose of this study was to examine the effects of Compound Dan-shen Root Dropping Pill (CDRDP) (Tasly Group, Tianjing, China) on hemorheology and biorheology of dogs suffering from hyperlipidemia induced by high-fat diet. Eighteen dogs were randomly divided into two groups: the high-fat diet group (H group); the control group (C group), fed with a standard laboratory diet. Six month later, six dogs in the H group were chosen as the drug-taking group (D group), to which CDRDP was administered, fed with the same diet as H group. In the 4th month, blood was taken from the veins of the dogs, and blood triglyceride (TG), total cholesterol (TC), RBC hemorheological indexes as well as malondialdehyde (MDA), glutathione transferase (GSH-ST) and superoxide dismutase (SOD) activities in plasma and erythrocytes were measured. Compared with H group, TC, TG, plasma MDA levels, the whole blood viscosity, RBC osmotic fragility and the value of CHOL (cholesterol)/PL (phospholipid) of the membrane of D group decreased, however, erythrocyte GSH-ST, histopathological changes in liver, deformation index (DI), orientation index (DI)or, small deformation index (DI)d, electrophoresis ratio and microfluidity of the membrane lipid bilayer of RBCs, increased distinctly. CDRDP can improve micro-hemorheological characteristics, therefore has a significant therapy application of hyperlipidemia.
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Affiliation(s)
- Jun Guo
- Hemorheology Center, Department of Biophysics, School of Basic Medical Sciences, Peking University, Beijing, 100083, P.R. China
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31
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Xu X, Zeng Z, Yao W, Sun D, Ka W, Zhou S, Wen Z. Alterations in hemorheological properties of erythrocytes in nude mice with erythroleukemia and the treatment effects of etoposide. Clin Hemorheol Microcirc 2005; 33:347-61. [PMID: 16317244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
The purpose of this study was to examine the changes of hemorheological properties of erythrocytes in the nude mice with erythroleukemia and the treatment effects of etoposide (VP16). Thirty mice were randomly divided into three groups: the control group (C group), injected with 1 ml saline solution, the MEL group (M group) injected with 1 ml MEL (murine erythroleukemia cell line) and the MEL + VP16 group (V group) injected with 1 ml MEL and from the 8th day after injection, 20 microl VP16 (1 microg/microl) was injected intraperitoneally every five days. One week after MEL injection, erythroblastic cells increased in the bone marrow and proerythroblasts were found in the peripheral blood, suggesting that erythroleukemia was induced. Abnormalities were also found in spleens and livers later. At around twenty days after injection, the mice in M group died and about four weeks after injection, the mice in V group also died. Compared with C group, the hemorheological indexes [the deformation index DI, orientation index (DI(or)), and the small deformation index (DI(d))], electrophoretic mobility, membrane fluidity as well as osmotic fragility of red blood cells (RBC) in M and V groups changed significantly. But after VP16 administration, the changes of above parameters in V group were less significant than those of M group. The results above suggested that intraperitoneal injection of MEL cells could cause erythroleukemia in nude mice, VP16 could alleviate the erythroleukemia symptom and improve the hemorheological properties, and could prolong V group nude mice survival.
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MESH Headings
- Animals
- Antineoplastic Agents, Phytogenic/administration & dosage
- Blood Viscosity/drug effects
- Erythroblasts/pathology
- Erythrocytes/pathology
- Etoposide/administration & dosage
- Female
- Hemorheology/methods
- Leukemia, Erythroblastic, Acute/blood
- Leukemia, Erythroblastic, Acute/drug therapy
- Leukemia, Erythroblastic, Acute/pathology
- Liver/pathology
- Male
- Mice
- Mice, Nude
- Neoplasms, Experimental/blood
- Neoplasms, Experimental/drug therapy
- Neoplasms, Experimental/pathology
- Spleen/pathology
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Affiliation(s)
- Xiaofeng Xu
- Department of Biophysics, Health Science Center, Peking University, Beijing, PR China
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32
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Jiang Y, Zeng Z, Sun D, Ka W, Wen Z. Adhesion of monocyte-derived dendritic cells to human umbilical vein endothelial cells in flow field decreases upon maturation. Clin Hemorheol Microcirc 2005; 32:261-8. [PMID: 15894824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Dendritic cells (DC) are sentinels of the immune system. They and their precursors undergo complex migration to perform their function in vivo. Binding of DC to vascular endothelial cells in a flow field has not been investigated. We therefore determined adhesion of DC and their precursors, MO, to human umbilical vein endothelial cells (HUVECs) under various shear stresses by using a flow chamber system. The results showed that the binding was reduced with developmental stages of DC, which partially depended on CD11a and cell surface charges. The data had potential relevance for anti-cancer immunotherapy strategies favoring the application of mDC.
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Affiliation(s)
- Yuhui Jiang
- Department of Biophysics, Peking University Health Science Center, Beijing, China
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33
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Gu L, Xie L, Yao W, Ka W, Sun D, Wen Z. [FTIR spectroscopy studies on the apoptosis-promoting effect of TFAR19 on the erythroleukemia cell line MEL]. Sheng Wu Yi Xue Gong Cheng Xue Za Zhi 2004; 21:449-52. [PMID: 15250154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
The changes in the cellular main components of the mouse erythroleukemia cell line MEL for TFAR19 gene transfection were studied by the technology of Fourier transform infrared spectroscopy (FTIR). Using the method of gene transfection with liposome, we obtained MEL-TF19 cell line, which stably carries TFAR19, a novel apoptosis-related gene. The expression of the gene on mRNA level was confirmed by RT-PCR. Then, FTIR spectra of the cells were measured in the course of apoptosis induced by serum deprivation. Our results indicated that after being transfected with TFAR19 gene, MEL-TF19 cells exhibited relatively higher protein content, higher transcriptional activity, and relatively lower phospholipid content as compared with those exhibited by MEL cells. All the above changes reflect the apoptosis-promoting effect of TFAR19 gene, and maybe account for the cellular rheological changes after TFAR19 gene transfection, which were discovered in our previous study.
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Affiliation(s)
- Li Gu
- School of Life Science of Shandong University, Jinan 250150, China
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34
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Yao W, Gu L, Sun D, Ka W, Wen Z, Chien S. Wild type p53 gene causes reorganization of cytoskeleton and, therefore, the impaired deformability and difficult migration of murine erythroleukemia cells. Cell Motil Cytoskeleton 2003; 56:1-12. [PMID: 12905527 DOI: 10.1002/cm.10129] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
We studied the role of p53 gene in the biophysics and biology in murine erythroleukemia cell line (MEL), with the goal of understanding the influence of this tumor suppressor gene on the deformability and metastasis of tumor cells. Experiments were performed on MEL and p53-transfected MEL (MEL-M with mutant p53 gene and MEL-W with wild-type p53 gene). The cell growth curves indicated that the over-expression of wild-type p53 gene significantly suppressed the growth of MEL, with G(0)-G(1) arrest and apoptosis shown by flow cytometric assays. Confocal laser scanning microscopy revealed that the MEL-W had a more compact organization of the F-Actin cytoskeleton than MEL and MEL-M. Fluorescence polarization measurement indicated a higher membrane fluidity of MEL-W than the other two groups. Fourier transform infrared spectroscopy (FT-IR) showed changes in the composition and/or structure of membrane lipids in MEL-W, with decreases in secondary structures of proteins such as alpha-helix, turns and bends and random coil, in comparison to MEL and MEL-M. The osmotic fragility curves indicated that MEL-W was more fragile and micropipette experiments showed that they had increased elasticity and reduced deformability in comparison to MEL and MEL-M. The adhesion assay with the use of the flow chamber revealed a lower adhesion rate of MEL-W to endothelial cells at high shear stress. The present study on the molecular biology with biophysics of MEL cells contributes to our knowledge on the tumor suppressor gene p53.
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Affiliation(s)
- Weijuan Yao
- School of Basic Medical Sciences, Peking University, Beijing, Peoples Republic of China
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35
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Wang J, Ka W, Tang Z, Sun D, Wen Z. Rheological studies on precursor cells at different stages in mice. Clin Hemorheol Microcirc 2003; 29:63-9. [PMID: 14610301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/27/2023]
Abstract
The deformability and membrane fluidity of the precursor cells for mice at different growth stages were studied; and it was found that the deformability and membrane fluidity were increased with the growth of the precursor cells. It is demonstrated that the normoblast was just placed in a turning point in the growth stage of the precursor cells. The changes are associated with the smaller the nucleus, the smaller the ratio of nucleus and cytoplasm, and the expression of membrane skeleton protein, and so on. It is also found that the order parameter (S) obtained by ESR is negatively correlated with the small deformation index (DI)(d,max) obtained by LBY-BX2 ektacytometer, while the value of R2 (square of correlation coefficient) is 0.9816. Such conclusion shows that the order parameter (S) is basically in accordance with the small deformation index (DI)(d,max).
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Affiliation(s)
- Jinhua Wang
- Department of Medical Physics, Basic Medical School of Peking University, Beijing, PR China
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36
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Wen Z, Xie L, Yan Z, Yao W, Chen K, Ka W, Chien S. Effect of 60Co irradiation on characteristics of hemorheology in rabbits. Clin Hemorheol Microcirc 2002; 25:75-81. [PMID: 11790873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
A high-dose (7 Gy) whole-body 60Co irradiation for a short period caused disturbances of hematopoietic function. A decrease in the hematocrit of the circulating blood lasted for about 15 days, thus forming an anemic animal model. We studied the influence of high-dose 60Co irradiation on hemorheologic parameters: percentage of reticulocytes, RBC deformability, sedimentation rate and plasma fibrinogen concentration in the rabbit. It was found that the plasma fibrinogen concentration increased to twice more than control level and that percentage of reticulocytes in circulation disappeared immediately after irradiation. The deformation index of RBCs in shear flow decreased from a value of 58% down to a value of 42% in the first two weeks and gradually returned to control levels about 40 days after 60Co irradiation. Our results showed that a short period of high-dose 60Co irradiation caused severe and relatively long-lasting damage of hematopoietic system in animals' body.
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Affiliation(s)
- Z Wen
- Hemorheology Center, Department of Biophysics, School of Basic Medical Sciences, Peking University, Beijing, 100083, P.R. China.
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37
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Abstract
The flow chamber was used to observe the orientation and small deformation of red blood cells (RBCs) in a shear flow of low viscosity. With the aid of computer software, the percentage of RBCs oriented to the C=0 orbit (OI)(F) and the degree of deformation (DI)(F) of such RBCs were calculated by processing the photographs. It was found that these parameters were highly correlated, respectively, to the orientation index (OI)(E) and the small deformation index (DI)(E) obtained by our low viscosity Ektacytometry (LVE). Thus, our flow chamber research has provided direct evidence to validate the use of this low viscosity Ektacytometry. Although there are relative merits for the flow chamber method using low viscosity medium, the LVE is more likely to be applied in clinic for its simplicity and convenience.
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Affiliation(s)
- W Yao
- Department of Biophysics, Hemorheology center, School of Basic Medical Sciences, Peking University, Beijing 100083, People's Republic of China
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38
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Xie L, Yang H, Yao W, Liu D, Zeng Z, Ka W, Sun D, Wen Z. [Effects of the alterations of membrane shear elastic modulus and viscosity on the deformation and orientation of RBCs]. Sheng Wu Yi Xue Gong Cheng Xue Za Zhi 2001; 18:218-22, 226. [PMID: 11450538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
Neuraminidase can partly remove the surface charge of RBCs through a biochemical interaction; thus it can give rise to alterations in the microstructure of membrane, the shear elastic modulus (E) and the viscosity(micron) of membrane. Changing the time of treatment and the dose of neuraminidase and using a new ektacytometry that can separate deformation index DI into orientation index (DI)or and small deformation index (DI)d for RBCs in shear flow field of low viscosity, we measured (DI)d and the half time t0.5 when the DI recovered to half of the maximum in the process of relaxation for every treated sample. (DI)d and t0.5 were put respectively into the RBC membrane shear elastic modulus formula and the membrane viscosity formula which were put forward by Wen Zong-yao and Yan Zong-yi et al[1]. The rules of the alterations of E and micron were obtained. We also measured DI and (DI)or. It was found that E and micron increased greatly but DI and (DI)or decreased when the dose of neuraminidase and the time of treatment were increased. There was a contrary correlation between them. These data demonstrated that the increase of E and micron weakened the deformability and the ability of orientation of RBCs.
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Affiliation(s)
- L Xie
- Dept. of Medical Physics, Beijing Medical University, Beijing 100083
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39
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Wen Z, Yao W, Xie L, Yan ZY, Chen K, Ka W, Sun D. Influence of neuraminidase on the characteristics of microrheology of red blood cells. Clin Hemorheol Microcirc 2001; 23:51-7. [PMID: 11214713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
Surface charge was removed from RBC (erythrocyte) membrane to different degrees with biochemical methods, i.e., treatment of RBCs with neuraminidase, either using different doses for the same incubation time (1 hour) or using the same dose (75 milli-unit) for different incubation time. Several rheological properties of the RBCs with surface charge removal were observed, including the deformation index DI (using traditional ektacytometry) orientation index (DI)or and small deformation index (Dl)d (using new ektacytometry), the viscosity at low and high shear rates (using a cone-plate rotating viscosimeter). In addition, photographs of RBCs aggregation under a microscope and the histograms of RBC aggregate size after treatment with neuraminidase were obtained. It is found from these experiments that the decrease of the surface charge of RBCs leads to the decrease in the deformation and orientation indices as well as the increase in blood viscosity.
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Affiliation(s)
- Z Wen
- Hemorheology Center, Department of Medical Physics, Beijing Medical University, PR China.
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