1
|
Fernández-Alvarez AJ, Thomas MG, Pascual ML, Habif M, Pimentel J, Corbat AA, Pessoa JP, La Spina PE, Boscaglia L, Plessis A, Carmo-Fonseca M, Grecco HE, Casado M, Boccaccio GL. Smaug1 membrane-less organelles respond to AMPK/mTOR and affect mitochondrial function‡. J Cell Sci 2021; 135:273619. [PMID: 34859817 DOI: 10.1242/jcs.253591] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [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: 09/09/2020] [Accepted: 11/15/2021] [Indexed: 11/20/2022] Open
Abstract
Smaug is a conserved translational regulator that binds numerous mRNAs, including nuclear transcripts that encode mitochondrial enzymes. Smaug orthologs form cytosolic membrane-less organelles (MLOs) in several organisms and cell types. We have performed single-molecule FISH assays that revealed that SDHB and UQCRC1 mRNAs associate with Smaug1 bodies in U2OS cells. Loss of function of Smaug1 and Smaug2 affected both mitochondrial respiration and morphology of the mitochondrial network. Phenotype rescue by Smaug1 transfection depends on the presence of its RNA binding domain. Moreover, we identified specific Smaug1 domains involved in MLO formation, and found that impaired Smaug1 MLO condensation correlates with mitochondrial defects. Mitochondrial Complex I inhibition by rotenone -but not strong mitochondrial uncoupling by CCCP- rapidly induced Smaug1 MLOs dissolution. Metformin and rapamycin elicited similar effects, which were blocked by pharmacological inhibition of AMPK. Finally, we found that Smaug1 MLO dissolution weakens the interaction with target mRNAs, thus enabling their release. We propose that mitochondrial respiration and the AMPK/mTOR balance controls the condensation and dissolution of Smaug1 MLOs, thus regulating nuclear mRNAs that encode key mitochondrial proteins.
Collapse
Affiliation(s)
- Ana J Fernández-Alvarez
- Fundación Instituto Leloir (FIL).,Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA) - Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), C1405BWE Buenos Aires, Argentina
| | - María Gabriela Thomas
- Fundación Instituto Leloir (FIL).,Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA) - Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), C1405BWE Buenos Aires, Argentina
| | - Malena L Pascual
- Fundación Instituto Leloir (FIL).,Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA) - Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), C1405BWE Buenos Aires, Argentina
| | - Martín Habif
- Department of Physics, Facultad de Ciencias Exactas y Naturales (FCEN), University of Buenos Aires, and IFIBA, CONICET, C1428EHA Buenos Aires, Argentina
| | - Jerónimo Pimentel
- Fundación Instituto Leloir (FIL).,Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA) - Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), C1405BWE Buenos Aires, Argentina
| | - Agustín A Corbat
- Department of Physics, Facultad de Ciencias Exactas y Naturales (FCEN), University of Buenos Aires, and IFIBA, CONICET, C1428EHA Buenos Aires, Argentina
| | - João P Pessoa
- Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina, Universidade de Lisboa, Lisboa, Portugal
| | - Pablo E La Spina
- Fundación Instituto Leloir (FIL).,Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA) - Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), C1405BWE Buenos Aires, Argentina
| | | | - Anne Plessis
- Institut Jacques Monod, CNRS, UMR 7592, University Paris Diderot, Sorbonne Paris Cité, F-75205 Paris, France
| | - Maria Carmo-Fonseca
- Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina, Universidade de Lisboa, Lisboa, Portugal
| | - Hernán E Grecco
- Department of Physics, Facultad de Ciencias Exactas y Naturales (FCEN), University of Buenos Aires, and IFIBA, CONICET, C1428EHA Buenos Aires, Argentina
| | - Marta Casado
- Instituto de Biomedicina de Valencia, IBV-CSIC, Valencia 46010, Spain, and Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), Madrid 28029, Spain
| | - Graciela L Boccaccio
- Fundación Instituto Leloir (FIL).,Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA) - Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), C1405BWE Buenos Aires, Argentina.,Department of Molecular and Cellular Biology and Physiology (FBMyC), Facultad de Ciencias Exactas y Naturales (FCEN), University of Buenos Aires, C1428EHA Buenos Aires, Argentina
| |
Collapse
|
2
|
Tupasi TE, Radhakrishna S, Co VM, Villa ML, Quelapio MI, Mangubat NV, Sarol JN, Rivera AB, Pascual ML, Reyes AC, Sarmiento A, Solon M, Solon FS, Burton L, Mantala MJ. Bacillary disease and health seeking behavior among Filipinos with symptoms of tuberculosis: implications for control. Int J Tuberc Lung Dis 2000; 4:1126-32. [PMID: 11144454] [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: 02/18/2023] Open
Abstract
SETTING Urban and rural communities and urban poor settlements in the Philippines. OBJECTIVE To determine bacillary disease and action taking among individuals with symptoms of tuberculosis (TB), and to analyze their implications for TB control. STUDY DESIGN AND METHOD Subjects aged 20 years and older were interviewed in the 1997 nationwide stratified multi-cluster survey. Sputum acid-fast smears and cultures were done in subjects with abnormal screening chest radiographs. RESULTS Individuals with TB symptoms comprised 18.1% of the population studied. The prevalence of bacillary disease was 39/1000 in symptomatic subjects compared to 13/1000 in asymptomatic subjects. Symptom screening had a 14.3% positive predictive value and a 91.4% negative predictive value for bacillary disease. Significantly more symptomatic than asymptomatic subjects attended chest radiographic screening during the survey. However, in response to their symptoms, the majority (43.0%) took no action or self medicated (31.6%), while 11.8% consulted a private practitioner, 7.5% a public health center, 4.4% a hospital, and 1.7% a traditional healer. CONCLUSION Sputum smear examination after symptom screening was acceptable for case finding. The health seeking behavior of subjects with TB symptoms was inappropriate. A health education program and public-private collaboration in directly observed therapy, short course (DOTS) are essential for TB control in the Philippines.
Collapse
Affiliation(s)
- T E Tupasi
- Tropical Disease Foundation, Makati Medical Center, Makati City, Philippines.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
3
|
Tupasi TE, Radhakrishna S, Pascual ML, Quelapio MI, Villa ML, Co VM, Sarol J, Mangubat N, Reyes AC, Sarmiento A, Solon M, Solon F, Burton L, Lofranco VS, Rostrata MP, Mantala MJ. BCG coverage and the annual risk of tuberculosis infection over a 14-year period in the Philippines assessed from the Nationwide Prevalence Surveys. Int J Tuberc Lung Dis 2000; 4:216-22. [PMID: 10751066] [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: 02/16/2023] Open
Abstract
SETTING A prevalence survey of tuberculosis (TB) infection was undertaken in the Philippines, a developing country in the Western Pacific region. OBJECTIVE To determine the bacille Calmette Guerin (BCG) vaccination rate, the prevalence of TB infection and the annual risk of TB infection (ARTI). METHODS A nationwide stratified multi-stage cluster survey of 21,960 individuals. BCG scar verification and tuberculin test were performed on those aged > or =2 months. The ARTI was calculated using the prevalence rates of TB infection in children aged 5-9 years. RESULTS BCG scars were noted in 66% of the study population. The prevalence of TB infection was 63.4% among unvaccinated individuals. The prevalence rate was higher in males in both urban and rural areas. With both sexes combined, urban and rural communities had similar prevalence rates. In children aged 5-9 years, the prevalence rate was 16.1% (males 17.4%, females 14.9%), corresponding to an ARTI of 2.3% (males 2.5%, females 2.1%). CONCLUSION BCG coverage increased substantially between 1981-1983 and 1997. The ARTI, however, was virtually unchanged, indicating that morbidity due to TB continued to be high.
Collapse
Affiliation(s)
- T E Tupasi
- Tropical Disease Foundation, Makati Medical Center, Makati City, The Philippines.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
4
|
Tupasi TE, Radhakrishna S, Quelapio MI, Villa ML, Pascual ML, Rivera AB, Sarmiento A, Co VM, Sarol JN, Beltran G, Legaspi JD, Mangubat NV, Reyes AC, Solon M, Solon FS, Burton L, Mantala MJ. Tuberculosis in the urban poor settlements in the Philippines. Int J Tuberc Lung Dis 2000; 4:4-11. [PMID: 10654637] [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: 02/15/2023] Open
Abstract
SETTING Urban poor settlements in the Philippines. OBJECTIVE To determine the magnitude of the tuberculosis problem in urban poor settlements in comparison with urban areas studied in the Nationwide Tuberculosis Prevalence Survey. STUDY DESIGN AND METHOD A multistage cluster survey of BCG scar, tuberculin test, chest radiography and sputum examination for bacillary disease, in urban poor areas. RESULTS The prevalences of culture-positive and smear-positive tuberculosis were 17.5 +/- 2.3 (95% CI 13.3-22.4) and 7.9 +/- 2.3 per thousand (95% CI 2.611.5), respectively. Extrapolated to the total population, the rates in the urban poor settlements were 12.4 +/- 1.7 (95% CI 9.6-16.2) and 5.6 +/- 1.6 per thousand population (95% CI 1.3-8.3), respectively. The prevalence of active pulmonary tuberculosis in subjects aged 10 years or more was 66 +/- 5.6/1000 (95% CI 55-77). The BCG vaccination rate was 72%. The overall prevalence of tuberculosis infection was 66%, and 39% in those aged 5-9 years, corresponding to an annual risk of infection (ARI) of 6.5%. CONCLUSION The problem of tuberculosis was substantial in the urban poor settlements, and was appreciably worse than that in the general urban population.
Collapse
Affiliation(s)
- T E Tupasi
- Tropical Disease Foundation, Makati Medical Center, Makati City, The Philippines.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
5
|
Tupasi TE, Radhakrishna S, Rivera AB, Pascual ML, Quelapio MI, Co VM, Villa ML, Beltran G, Legaspi JD, Mangubat NV, Sarol JN, Reyes AC, Sarmiento A, Solon M, Solon FS, Mantala MJ. The 1997 Nationwide Tuberculosis Prevalence Survey in the Philippines. Int J Tuberc Lung Dis 1999; 3:471-7. [PMID: 10383058] [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: 02/13/2023] Open
Abstract
SETTING The Philippines is a developing country where tuberculosis (TB) remains a significant public health problem. OBJECTIVE To determine the prevalence of TB as a basis for setting the targets of the National Tuberculosis Control Program. STUDY POPULATION AND METHODS A multi-stage cluster survey of a random sample of 21960 subjects from 36 clusters nationwide was undertaken from 2 April to 31 July 1997. BCG scar verification and tuberculin testing was performed for subjects aged 2 months and over, and chest radiography screening was done on subjects 10 years and older. Sputum samples were collected from individuals who were initially assessed to have abnormal chest radiographs to determine the prevalence of bacillary tuberculosis. Acid-fast smear by modified Kinyoun's technique and culture on Löwenstein Jensen were done to demonstrate Mycobacterium tuberculosis. RESULTS The prevalence of active pulmonary TB was 42/1000 population. The prevalence of culture-positive and smear-positive cases was 8.1 and 3.1/1000, respectively. The prevalence was similar in urban and rural areas. CONCLUSION Morbidity from TB remains high. Allowing for methodological differences from the survey in 1981-1983, the prevalence of active pulmonary TB was unchanged. There was only a minimal decrease, of 37% for smear-positive cases and 25% for culture-positive cases, in the 14-year interval.
Collapse
Affiliation(s)
- T E Tupasi
- Tropical Disease Foundation, Makati Medical Center, Philippines.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
6
|
Arjona A, Castellanos F, Graus F, Sanchez P, Escamilla C, Pascual ML. Steroid-dependent anti-Hu negative paraneoplastic encephalomyelitis and small cell lung carcinoma. J Neurol 1998; 245:238-40. [PMID: 9591227 DOI: 10.1007/s004150050212] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
|
7
|
Arjona A, Mata M, Bartolomé MT, Pascual ML. [Wallenberg syndrome secondary to cardiac catheterization]. Neurologia 1998; 13:59-60. [PMID: 9522588] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
|
8
|
Arjona A, Mata M, García M, Pascual ML. [Primary hemorrhage of medulla oblongata. Letter]. Rev Neurol 1996; 24:352. [PMID: 8925462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
|
9
|
Pascual ML, Cebrian-Perez JA, Lopez-Perez MJ, Muino-Blanco T. Short-term inhibition of the energy metabolism affects motility but not surface properties of sperm cells. Biosci Rep 1996; 16:35-40. [PMID: 8861538 DOI: 10.1007/bf01200999] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [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: 02/02/2023] Open
Abstract
Centrifugal countercurrent distribution (CCCD) in aqueous two-phase systems has been proven to be a useful method to study subtle surface properties of spermatozoa. The present work shows that a short-term inhibition of the energy metabolism of sperm cells effected by incubating bovine sperm cells with KCN or ouabain, did not account for changes in the cell surface properties, as assessed either by estimation of the cell viability or by CCCD analysis. However, the short-term inhibition of energy metabolism provoked a clear decrease of cell motility, suggesting that a drop of cellular ATP levels brings about a rapid decrease of motility followed by a very delayed effect on cell surface properties. The relevance of these results on the handling of sperm and on the understanding of the molecular events underlying asthenospermia is discussed.
Collapse
Affiliation(s)
- M L Pascual
- Departamento de Bioquimica, Biologia Molecular y Celular, Facultad de Veterinaria, Zaragoza, Spain
| | | | | | | |
Collapse
|
10
|
López-Lozano JJ, Bravo G, Abascal J, Brera B, Pascual ML, Martínez R, de la Torre C, Moreno R. Clinical experience with cotransplantation of peripheral nerve and adrenal medulla in patients with Parkinson's disease. Transpl Int 1996; 9 Suppl 1:S485-91. [PMID: 8959892 DOI: 10.1007/978-3-662-00818-8_116] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [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: 02/03/2023]
Abstract
Coimplants of adrenal medulla (AM) and peripheral nerve (PN) in animal models of Parkinson's disease (PD) have shown that AM cells survive longer, tend to show neuronal phenotype, and enhance sprouting of host fibers. Since 1987, our implants of perfused AM and fetal ventral mesencephalon (FVM) in PD patients have achieved varying degrees of clinical improvement. If the donor tissue determines the improvement, different types of implants should result in qualitatively and quantitatively different degrees of improvement. The purpose of this study is to determine whether or not the clinical course, improvement slope, and reduction of medication observed in PD patients who undergo tissue transplantation (Tx) depend on the donor tissue type. In a pilot study, four grade IV-V PD patients received implants of precoincubated autologous AM and intercostal nerve in the caudate nucleus (open surgery). Clinical assessment was based on international scales (UPD) as reported for Tx of FVM and perfused AM. There were no systemic or neurologic complications. Four years post-Tx, longer On phases and improved PD symptoms (ADL and motor-UPD) in On and Off persist in four cases, with reduced dyskinesias. Progress appears to be stepwise, starting within weeks of Tx (similar to AM and sooner than our FVM implants), followed by a period of stability and, after a second wave of improvement 12-18 months post-Tx (similar to FVM implants), continues to date. L-dopa medication has been reduced by more than 60% and dopamine agonist use has not resumed. We conclude that our recipients continue to be clinically better than prior to Tx. The course of recovery after co-Tx of AM and PN differs from that of FVM or AM implants. This fact may be related to the etiological factors that produce the improvement.
Collapse
Affiliation(s)
- J J López-Lozano
- CPH Neural Transplantation Group (Departments of Neurology, Neurosurgery, Surgery and Laboratory Neurobiology), Clínica Puerta de Hierro, Madrid, Spain
| | | | | | | | | | | | | | | |
Collapse
|
11
|
Ollero M, Pascual ML, Muiño-Blanco T, Cebrián-Pérez JA, López-Pérez MJ. Revealing surface changes associated with maturation of ram spermatozoa by centrifugal counter-current distribution in an aqueous two-phase system. J Chromatogr A 1994; 668:173-8. [PMID: 7516244 DOI: 10.1016/0021-9673(94)80106-1] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [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: 01/25/2023]
Abstract
Centrifugal counter-current distribution (CCCD) in an aqueous two-phase system was used to detect changes associated with maturation of ejaculated ram spermatozoa. Spermatozoa obtained from three successive ejaculates of rams maintained in abstinence for one, two and three days were fractionated by CCCD. The results show that these ejaculates are relatively enriched in a cell population which presents a very high enhanced affinity to the lower dextran-rich phase. This cell population is not associated with loss of acrosomal integrity. In addition, it tends to disappear with longer abstinence periods, or after successive ejaculations at the same abstinence period, strongly suggesting that it is composed of immature cells. Therefore, phase partitioning can detect surface changes accompanying sperm maturation and offers a new possibility for sperm quality analysis.
Collapse
Affiliation(s)
- M Ollero
- Departmento de Bioquímica y Biología Molecular y Celular, Facultad de Veterinaria, Zaragoza, Spain
| | | | | | | | | |
Collapse
|
12
|
Pascual ML, Muiño-Blanco T, Cebrián-Pérez JA, López-Pérez MJ. Acquisition of viable-like surface properties of sperm cells by adsorption of seminal plasma proteins revealed by centrifugal countercurrent distribution. Biol Cell 1994; 82:75-8. [PMID: 7537569 DOI: 10.1016/0248-4900(94)90069-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [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: 01/25/2023]
Abstract
By using centrifugal countercurrent distribution in dextran/polyethylene glycol two-phase system, we show that the acquisition of adsorbed seminal plasma proteins by the sperm cell surface modifies the partition behaviour of bull spermatozoa reproducing that of alive cells. Thus, addition of increasing concentrations of proteins from the seminal plasma promoted a saturable enhanced affinity of the cells to the polyethylene glycol-rich phase in which alive cells preferentially partition. On the contrary, treatment with Tween provoked the opposite effect.
Collapse
Affiliation(s)
- M L Pascual
- Departamento de Bioquímica, Facultad de Veterinaria, Zaragoza, Spain
| | | | | | | |
Collapse
|
13
|
Pascual ML, Muiño-Blanco T, Rodellar C, López-Pérez MJ. Quantitative RFLP for the estimation of sex chromosome content in discrete bovine cell populations. Biotechniques 1993; 15:612, 614-5. [PMID: 7902721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Affiliation(s)
- M L Pascual
- Departamento de Bioquímica y Biología Molecular y Celular, Facultad de Veterinaria, Universidad de Zaragoza, Spain
| | | | | | | |
Collapse
|
14
|
Pérez Trullén JM, Modrego Pardo PJ, Vázquez André ML, Pascual ML, Liaño H. [Cognitive functions in agenesis of the corpus callosum]. Rev Clin Esp 1993; 193:179-81. [PMID: 8234982] [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: 01/29/2023]
Abstract
Four patients with agenesis of the corpus callosum diagnosed through neuroradiologic tests has been studied, from the upper cerebral functions point of view. Three had consulted because of seizure, and the other because of cerebellar hemorrhage. Multiple fields of the cognitive functions were examined and the presence of an interhemispheric disconnection syndrome was investigated. All tests were absolutely normal in the four patients. We discuss clinical and radiologic aspects as well as other associated malformations.
Collapse
|
15
|
Pascual ML, Muiño-Blanco T, Cebrián-Pérez JA, López-Pérez MJ. Sperm cell heterogeneity revealed by centrifugal counter-current distribution in an aqueous two-phase system. J Chromatogr 1993; 617:51-7. [PMID: 8376537 DOI: 10.1016/0378-4347(93)80420-9] [Citation(s) in RCA: 19] [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] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
In recent years, partitioning in aqueous two-phase systems has been developed as a mild separation procedure of high selectivity for studying cell surface properties. This work was undertaken to study the surface heterogeneity of bull and ram sperm cells by using centrifugal counter-current distribution in dextran-poly(ethylene glycol) two-phase systems. The revealed heterogeneity appears to be associated with different viability states of the fractionated cells. Various strands of evidence support this conclusion: (a) assessment of viability by fluorescence probes showed a different enrichment of live cells in the different fractions tested, dead spermatozoa showing enhanced affinity to the dextran-rich phase; (b) freezing or thermic shock of sperm cells, known methods of promoting loss of viability, provoked an increase in the number of cells with enhanced affinity to this phase; (c) the same effect was observed when sperm cells were obtained from ejaculates after longer periods of abstinence. The results presented here strongly suggest that loss of semen viability results in a decreased hydrophobicity of the cell surface. Thus this may be suitable for detecting sperm surface changes and to separate spermatozoa populations enriched in some functional and/or structural surface features.
Collapse
Affiliation(s)
- M L Pascual
- Departamento de Bioquímica y Biología Molecular y Celular, Facultad de Veterinaria, Zaragoza, Spain
| | | | | | | |
Collapse
|
16
|
Pascual ML, Muiño-Blanco T, Cebrian-Perez JA, Lopez-Perez MJ. Management of sedimentation in centrifugal counter-current distribution of sperm cells in an aqueous 2-phase system. J Biochem Biophys Methods 1992; 24:275-84. [PMID: 1322435 DOI: 10.1016/0165-022x(94)90079-5] [Citation(s) in RCA: 9] [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] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
It is generally assumed that centrifugal counter-current distribution (CCCD) in aqueous two-phase systems cannot be employed for analyzing or fractioning cell populations, due to large particles of sediment in the system caused by enhanced gravity. The present work was undertaken to find out whether addition of Percoll to a two-phase system would be a useful method to avoid this cell sedimentation. The results obtained show that bull spermatozoa partition as a unique peak in a CCCD using a Dextran T500-poly(ethylene glycol) 6000 system, and that sedimentation takes place significantly in the upper phase during the process. Addition of increasing concentrations of Percoll made this unique peak wider and two different populations of bull spermatozoa were finally obtained when Percoll concentration rose to 13.6%. This management of cell sedimentation in CCCD could be of great interest for analyzing cell heterogeneity, since the shortening of the time required for counter-current distribution should prevent the loss of cell viability during the separation process. Finally, the results obtained suggest that an increase of viscosity rather than of density is the phase feature which has greater influence on managing cell sedimentation in CCCD.
Collapse
Affiliation(s)
- M L Pascual
- Departamento de Bioquímica, Biología Molecular y Celular, Facultad de Veterinaria, Zaragoza, Spain
| | | | | | | |
Collapse
|
17
|
Pérez Trullén JM, Yusta A, Villagra P, Pascual ML, Escamilla C, Liaño H. [Kufs' disease. A review of the literature apropos a case]. Rev Clin Esp 1992; 190:403-6. [PMID: 1620941] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
|
18
|
Vargas JA, Yebra M, Pascual ML, Manzano L. [Sneddon syndrome and primary antiphospholipid syndrome: are they the same entity?]. Med Clin (Barc) 1990; 94:597. [PMID: 2355782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
|
19
|
|
20
|
Pascual ML, Rodríguez C, García-Merino JA, López F, Liaño H, Barceló B. [Posterior fossa syndrome in Hand-Schüller-Christian disease]. Med Clin (Barc) 1984; 82:863. [PMID: 6738218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
|
21
|
Liaño H, López-Lozano JJ, Ramírez A, Rabes C, Pascual ML. [Use of bromocriptine in Parkinson diseases in low doses at a slow rate. 40 patients]. Arch Neurobiol (Madr) 1984; 47:143-50. [PMID: 6508478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
|