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  1. Book ; Thesis: Regulation of actin dynamics by SWAP-70

    Chacón Martinez, Carlos Andrés

    2011  

    Author's details von Carlos Andrés Chacón Martínez
    Language English
    Size 133 Bl. : Ill., graph. Darst.
    Publishing country Germany
    Document type Book ; Thesis
    Thesis / German Habilitation thesis Dresden, Univ., Diss., 2012
    HBZ-ID HT017321066
    Database Catalogue ZB MED Medicine, Health

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  2. Article ; Online: Signaling in the stem cell niche: regulating cell fate, function and plasticity.

    Chacón-Martínez, Carlos Andrés / Koester, Janis / Wickström, Sara A

    Development (Cambridge, England)

    2018  Volume 145, Issue 15

    Abstract: Stem cells have the ability to self-renew and differentiate along multiple lineages, driving tissue homeostasis and regeneration. Paradigms of unidirectional, hierarchical differentiation trajectories observed in embryonic and hematopoietic stem cells ... ...

    Abstract Stem cells have the ability to self-renew and differentiate along multiple lineages, driving tissue homeostasis and regeneration. Paradigms of unidirectional, hierarchical differentiation trajectories observed in embryonic and hematopoietic stem cells have traditionally been applied to tissue-resident stem cells. However, accumulating evidence implicates stemness as a bidirectional, dynamic state that is largely governed by the niche, which facilitates plasticity and adaptability to changing conditions. In this Review, we discuss mechanisms of cell fate regulation through niche-derived cues, with a particular focus on epithelial stem cells of the mammalian skin, intestine and lung. We discuss a spectrum of niche-derived biochemical, mechanical and architectural inputs that define stem cell states during morphogenesis, homeostasis and regeneration, and highlight how these diverse inputs influence stem cell plasticity.
    MeSH term(s) Animals ; Cell Differentiation/genetics ; Cell Lineage/genetics ; Cell Physiological Phenomena ; Cell Plasticity/genetics ; Humans ; Signal Transduction/genetics ; Signal Transduction/physiology ; Stem Cell Niche/genetics ; Stem Cell Niche/physiology
    Language English
    Publishing date 2018-08-01
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 90607-4
    ISSN 1477-9129 ; 0950-1991
    ISSN (online) 1477-9129
    ISSN 0950-1991
    DOI 10.1242/dev.165399
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Dynamics of SARS-CoV-2 Alpha (B.1.1.7) variant spread: The wastewater surveillance approach.

    Carcereny, Albert / Garcia-Pedemonte, David / Martínez-Velázquez, Adán / Quer, Josep / Garcia-Cehic, Damir / Gregori, Josep / Antón, Andrés / Andrés, Cristina / Pumarola, Tomàs / Chacón-Villanueva, Carme / Borrego, Carles M / Bosch, Albert / Guix, Susana / Pintó, Rosa M

    Environmental research

    2022  Volume 208, Page(s) 112720

    Abstract: Wastewater based epidemiology (WBE) offers an overview of the SARS-CoV-2 variants circulating among the population thereby serving as a proper surveillance method. The variant of concern (VOC) Alpha was first identified in September 2020 in the United ... ...

    Abstract Wastewater based epidemiology (WBE) offers an overview of the SARS-CoV-2 variants circulating among the population thereby serving as a proper surveillance method. The variant of concern (VOC) Alpha was first identified in September 2020 in the United Kingdom, and rapidly became dominant across Europe. Our objective was to elucidate the Alpha VOC outcompetition rate and identify mutations in the spike glycoprotein (S) gene, indicative of the circulation of the Alpha VOC and/or other variants in the population through wastewater analysis. In the period covered by this study (November 2020-April 2021), forteen wastewater treatment plants (WWTPs) were weekly sampled. The total number of SARS-CoV-2 genome copies per L (GC/L) was determined with a Real-Time qPCR, targeting the N gene. Surveillance of the Alpha VOC circulation was ascertained using a duplex RT-qPCR, targeting and discriminating the S gene. Our results showed that in a period of 6 weeks the Alpha VOC was present in all the studied WWTPs, and became dominant in 11 weeks on average. The outcompetition rates of the Alpha VOC were estimated, and their relationship with different parameters statistically analyzed. The rapid spread of the Alpha VOC was influenced by its initial input and by the previous circulation of SARS-COV-2 in the population. This latter point could be explained by its higher transmissibility, particularly advantadgeous when a certain degree of herd immunity exists. Moreover, the presence of signature mutations of SARS-COV-2 variants were established by deep-sequencing of the complete S gene. The circulation of the Alpha VOC in the area under study was confirmed, and additionally two combinations of mutations in the S glycoprotein (T73A and D253N, and S477N and A522S) that could affect antibody binding were identified.
    MeSH term(s) COVID-19/epidemiology ; Humans ; SARS-CoV-2/genetics ; Waste Water ; Wastewater-Based Epidemiological Monitoring
    Chemical Substances Waste Water
    Language English
    Publishing date 2022-01-22
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 205699-9
    ISSN 1096-0953 ; 0013-9351
    ISSN (online) 1096-0953
    ISSN 0013-9351
    DOI 10.1016/j.envres.2022.112720
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: High prevalence of Leishmania spp. in dogs from Central West Colombia.

    Giraldo-Martínez, Leidy Alejandra / Petano-Duque, Julieth Michel / Uribe-García, Heinner Fabian / Chacón-Novoa, Roberto Andrés / Guzmán-Barragán, Blanca Lisseth / Rondón-Barragán, Iang

    Veterinaria italiana

    2022  Volume 58, Issue 4

    Abstract: Leishmaniasis is a widespread disease caused by species of the genus Leishmania. In Colombia, this zoonosis is endemic in rural areas with a high prevalence in the departments of Antioquia, Santander, Meta, Tolima and Nariño. Dogs are the most important ... ...

    Abstract Leishmaniasis is a widespread disease caused by species of the genus Leishmania. In Colombia, this zoonosis is endemic in rural areas with a high prevalence in the departments of Antioquia, Santander, Meta, Tolima and Nariño. Dogs are the most important domestic reservoirs of the pathogen, given the epidemiological importance of dogs in the control of leishmaniasis is needed to determine the prevalence of Leishmania spp. in canine population of the rural area of Ibagué and to identify potential risk factors related to the presence of this parasite. A cross-sectional study was carried out in 173 dogs from the rural area of Ibagué. Leishmania spp. was detected by amplifying the Internal Transcribed Spacer (ITS-1) and two regions of the hsp70 gene through PCR. Factor associations were calculated through the Chisquare and odds ratio. Prevalence of Leishmania spp. infection in dogs was of 91.33% (158/173), where 36.71% (58/158) of the Leishmania spp. positive dogs showed one or more clinical signs of canine leishmaniasis and 63.29% (100/158) of the dogs were asymptomatic. Factors associated with the presence of the parasite did not show significance. In addition, hsp70D-PCR was proved to be highly efficient for the detection of Leishmania spp.
    MeSH term(s) Animals ; Dogs ; Leishmania ; Prevalence ; Colombia/epidemiology ; Cross-Sectional Studies ; Zoonoses ; Dog Diseases/epidemiology
    Language English
    Publishing date 2022-12-31
    Publishing country Italy
    Document type Journal Article
    ZDB-ID 2536397-9
    ISSN 1828-1427 ; 0505-401X
    ISSN (online) 1828-1427
    ISSN 0505-401X
    DOI 10.12834/VetIt.2632.16820.2
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: First-line therapy with palbociclib in patients with advanced HR

    Martínez-Jañez, N / Ezquerra, M Bellet / Manso Sanchez, L M / Carrasco, F Henao / Torres, A Anton / Morales, S / Ortega, P Tolosa / Gil, V L Obadia / Sampedro, T / Conejero, R Andrés / Calvo-Martinez, L / Galve-Calvo, E / López, R / de la Pena, F Ayala / Lopez-Tarruella, S / de Araguiz, B A Hernando Fernandez / Ruiz, L Boronat / Cardenas, T Martos / Chacon, J I /
    Antón, F Moreno

    Breast cancer research and treatment

    2024  

    Abstract: Purpose: To evaluate the efficacy and safety of first-line therapy with palbociclib in a Spanish cohort treated after palbociclib approval.: Methods: PALBOSPAIN is an observational, retrospective, multicenter study evaluating real-world patterns and ... ...

    Abstract Purpose: To evaluate the efficacy and safety of first-line therapy with palbociclib in a Spanish cohort treated after palbociclib approval.
    Methods: PALBOSPAIN is an observational, retrospective, multicenter study evaluating real-world patterns and outcomes with 1 L palbociclib in men and women (any menopausal status) with advanced HR
    Results: A total of 762 patients were included. The median rw-PFS and OS were 24 months (95% CI 21-27) and 42 months (40-not estimable [NE]) in the whole population, respectively. By cohort, the median rw-PFS and OS were as follows: 28 (95% CI 23-39) and 44 (95% CI 38-NE) months in patients with de novo metastatic disease, 13 (95% CI 11-17) and 36 months (95% CI 31-41) in patients who experienced relapse < 12 months after the end of ET, and 31 months (95% CI 26-37) and not reached (NR) in patients who experienced relapse > 12 months after the end of ET. rw-PFS and OS were longer in patients with oligometastasis and only one metastatic site and those with non-visceral disease. The most frequent hematologic toxicity was neutropenia (72%; grade ≥ 3: 52.5%), and the most common non-hematologic adverse event was asthenia (38%).
    Conclusion: These findings, consistent with those from clinical trials, support use of palbociclib plus ET as 1 L for advanced BC in the real-world setting, including pre-menopausal women and men.
    Trial registration number: NCT04874025 (PALBOSPAIN). Date of registration: 04/30/2021 retrospectively registered.
    Language English
    Publishing date 2024-04-01
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 604563-7
    ISSN 1573-7217 ; 0167-6806
    ISSN (online) 1573-7217
    ISSN 0167-6806
    DOI 10.1007/s10549-024-07287-w
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: N1-acetylspermidine is a determinant of hair follicle stem cell fate.

    Allmeroth, Kira / Kim, Christine S / Annibal, Andrea / Pouikli, Andromachi / Koester, Janis / Derisbourg, Maxime J / Andrés Chacón-Martínez, Carlos / Latza, Christian / Antebi, Adam / Tessarz, Peter / Wickström, Sara A / Denzel, Martin S

    Journal of cell science

    2021  Volume 134, Issue 9

    Abstract: Stem cell differentiation is accompanied by increased mRNA translation. The rate of protein biosynthesis is influenced by the polyamines putrescine, spermidine and spermine, which are essential for cell growth and stem cell maintenance. However, the role ...

    Abstract Stem cell differentiation is accompanied by increased mRNA translation. The rate of protein biosynthesis is influenced by the polyamines putrescine, spermidine and spermine, which are essential for cell growth and stem cell maintenance. However, the role of polyamines as endogenous effectors of stem cell fate and whether they act through translational control remains obscure. Here, we investigate the function of polyamines in stem cell fate decisions using hair follicle stem cell (HFSC) organoids. Compared to progenitor cells, HFSCs showed lower translation rates, correlating with reduced polyamine levels. Surprisingly, overall polyamine depletion decreased translation but did not affect cell fate. In contrast, specific depletion of natural polyamines mediated by spermidine/spermine N1-acetyltransferase (SSAT; also known as SAT1) activation did not reduce translation but enhanced stemness. These results suggest a translation-independent role of polyamines in cell fate regulation. Indeed, we identified N1-acetylspermidine as a determinant of cell fate that acted through increasing self-renewal, and observed elevated N1-acetylspermidine levels upon depilation-mediated HFSC proliferation and differentiation in vivo. Overall, this study delineates the diverse routes of polyamine metabolism-mediated regulation of stem cell fate decisions. This article has an associated First Person interview with the first author of the paper.
    Language English
    Publishing date 2021-05-11
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2993-2
    ISSN 1477-9137 ; 0021-9533
    ISSN (online) 1477-9137
    ISSN 0021-9533
    DOI 10.1242/jcs.252767
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: High prevalence of Leishmania spp. in dogs from Central West Colombia

    Leidy Alejandra Giraldo-Martínez / Julieth Michel Petano-Duque / Heinner Fabian Uribe-García / Roberto Andrés Chacón-Novoa / Blanca Lisseth Guzmán-Barragán / Iang Rondón-Barragán

    Veterinaria Italiana, Vol 58, Iss

    2022  Volume 4

    Abstract: Leishmaniasis is a widespread disease caused by species of the genus Leishmania. In Colombia, this zoonosis is endemic in rural areas with a high prevalence in the departments of Antioquia, Santander, Meta, Tolima and Nariño. Dogs are the most important ... ...

    Abstract Leishmaniasis is a widespread disease caused by species of the genus Leishmania. In Colombia, this zoonosis is endemic in rural areas with a high prevalence in the departments of Antioquia, Santander, Meta, Tolima and Nariño. Dogs are the most important domestic reservoirs of the pathogen, given the epidemiological importance of dogs in the control of leishmaniasis is needed to determine the prevalence of Leishmania spp. in canine population of the rural area of Ibagué and to identify potential risk factors related to the presence of this parasite. A cross-sectional study was carried out in 173 dogs from the rural area of Ibagué. Leishmania spp. was detected by amplifying the Internal Transcribed Spacer (ITS-1) and two regions of the hsp70 gene through PCR. Factor associations were calculated through the Chisquare and odds ratio. Prevalence of Leishmania spp. infection in dogs was of 91.33% (158/173), where 36.71% (58/158) of the Leishmania spp. positive dogs showed one or more clinical signs of canine leishmaniasis and 63.29% (100/158) of the dogs were asymptomatic. Factors associated with the presence of the parasite did not show significance. In addition, hsp70D-PCR was proved to be highly efficient for the detection of Leishmania spp.
    Keywords Canine leishmaniasis ; canine ; hsp70 ; ITS-1 ; risk factors ; Animal culture ; SF1-1100 ; Veterinary medicine ; SF600-1100
    Subject code 630
    Language English
    Publishing date 2022-12-01T00:00:00Z
    Publisher Istituto Zooprofilattico Sperimentale dell'Abruzzo e del Molise G. Caporale
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article: Dynamics of SARS-CoV-2 Alpha (B.1.1.7) variant spread: The wastewater surveillance approach

    Carcereny, Albert / Garcia-Pedemonte, David / Martínez-Velázquez, Adán / Quer, Josep / Garcia-Cehic, Damir / Gregori, Josep / Antón, Andrés / Andrés, Cristina / Pumarola, Tomàs / Chacón-Villanueva, Carme / Borrego, Carles M. / Bosch, Albert / Guix, Susana / Pintó, Rosa M.

    Environmental research. 2022 May 15, v. 208

    2022  

    Abstract: Wastewater based epidemiology (WBE) offers an overview of the SARS-CoV-2 variants circulating among the population thereby serving as a proper surveillance method.The variant of concern (VOC) Alpha was first identified in September 2020 in the United ... ...

    Abstract Wastewater based epidemiology (WBE) offers an overview of the SARS-CoV-2 variants circulating among the population thereby serving as a proper surveillance method.The variant of concern (VOC) Alpha was first identified in September 2020 in the United Kingdom, and rapidly became dominant across Europe. Our objective was to elucidate the Alpha VOC outcompetition rate and identify mutations in the spike glycoprotein (S) gene, indicative of the circulation of the Alpha VOC and/or other variants in the population through wastewater analysis.In the period covered by this study (November 2020–April 2021), forteen wastewater treatment plants (WWTPs) were weekly sampled. The total number of SARS-CoV-2 genome copies per L (GC/L) was determined with a Real-Time qPCR, targeting the N gene. Surveillance of the Alpha VOC circulation was ascertained using a duplex RT-qPCR, targeting and discriminating the S gene. Our results showed that in a period of 6 weeks the Alpha VOC was present in all the studied WWTPs, and became dominant in 11 weeks on average. The outcompetition rates of the Alpha VOC were estimated, and their relationship with different parameters statistically analyzed. The rapid spread of the Alpha VOC was influenced by its initial input and by the previous circulation of SARS-COV-2 in the population. This latter point could be explained by its higher transmissibility, particularly advantadgeous when a certain degree of herd immunity exists. Moreover, the presence of signature mutations of SARS-COV-2 variants were established by deep-sequencing of the complete S gene. The circulation of the Alpha VOC in the area under study was confirmed, and additionally two combinations of mutations in the S glycoprotein (T73A and D253N, and S477N and A522S) that could affect antibody binding were identified.
    Keywords Severe acute respiratory syndrome coronavirus 2 ; antibodies ; epidemiology ; genes ; glycoproteins ; herd immunity ; high-throughput nucleotide sequencing ; monitoring ; research ; wastewater ; wastewater treatment ; United Kingdom
    Language English
    Dates of publication 2022-0515
    Publishing place Elsevier Inc.
    Document type Article
    ZDB-ID 205699-9
    ISSN 1096-0953 ; 0013-9351
    ISSN (online) 1096-0953
    ISSN 0013-9351
    DOI 10.1016/j.envres.2022.112720
    Database NAL-Catalogue (AGRICOLA)

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  9. Article ; Online: Hair follicle stem cell cultures reveal self-organizing plasticity of stem cells and their progeny.

    Chacón-Martínez, Carlos Andrés / Klose, Markus / Niemann, Catherin / Glauche, Ingmar / Wickström, Sara A

    The EMBO journal

    2016  Volume 36, Issue 2, Page(s) 151–164

    Abstract: Understanding how complex tissues are formed, maintained, and regenerated through local growth, differentiation, and remodeling requires knowledge on how single-cell behaviors are coordinated on the population level. The self-renewing hair follicle, ... ...

    Abstract Understanding how complex tissues are formed, maintained, and regenerated through local growth, differentiation, and remodeling requires knowledge on how single-cell behaviors are coordinated on the population level. The self-renewing hair follicle, maintained by a distinct stem cell population, represents an excellent paradigm to address this question. A major obstacle in mechanistic understanding of hair follicle stem cell (HFSC) regulation has been the lack of a culture system that recapitulates HFSC behavior while allowing their precise monitoring and manipulation. Here, we establish an in vitro culture system based on a 3D extracellular matrix environment and defined soluble factors, which for the first time allows expansion and long-term maintenance of murine multipotent HFSCs in the absence of heterologous cell types. Strikingly, this scheme promotes de novo generation of HFSCs from non-HFSCs and vice versa in a dynamic self-organizing process. This bidirectional interconversion of HFSCs and their progeny drives the system into a population equilibrium state. Our study uncovers regulatory dynamics by which phenotypic plasticity of cells drives population-level homeostasis within a niche, and provides a discovery tool for studies on adult stem cell fate.
    MeSH term(s) Animals ; Cell Culture Techniques/methods ; Cell Differentiation ; Hair Follicle/cytology ; Mice, Inbred BALB C ; Mice, Inbred C57BL ; Organ Culture Techniques/methods ; Stem Cells/physiology
    Language English
    Publishing date 2016-12-09
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 586044-1
    ISSN 1460-2075 ; 0261-4189
    ISSN (online) 1460-2075
    ISSN 0261-4189
    DOI 10.15252/embj.201694902
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Associated factors for mortality in a COVID-19 colombian cohort: is the third wave relevant when Mu variant was predominant epidemiologically?

    Alvarez-Moreno, Carlos / Valderrama-Beltran, Sandra Liliana / Silva, Ronaldo / De La Hoz Siegler, Ilich Herbert / Varón Vega, Fabio Andrés / Martínez-Vernaza, Samuel / Blanco, Tatiana Ordoñez / Padilla, Mónica / Mesa-Rubio, María Lucía / Castañeda Pascagaza, Laura Carmenza / Rojas, José Antonio / Bravo Ojeda, Juan Sebastián / Villa, Jaime / Chacón Sarmiento, Julio Alberto / Yomayusa, Nancy / Patiño, Sandra / Gómez-Nieto, Katherine / Martínez Pinzón, Viviana Lorena / Ramírez Cogollo, Angélica María /
    Toloza, Carlos / Diaz-Puentes, Melissa / Cañas-Arboleda, Alejandra / Manrique-Andrade, Margarita / Ayub, Roberto Tarud / López Mora, María José / Pachón Espinosa, María Julieta / Cortés, Jorge Alberto / Sánchez, Laura Catalina / Chacón Acevedo, Kelly Rocío / Rengifo, Paola / Tambini, Ginna / Bertagnolio, Silvia / Diaz, Janet / Thwin, Soe-Soe / Reveiz, Ludovic

    Travel medicine and infectious disease

    2023  Volume 53, Page(s) 102579

    Abstract: Objectives: To evaluate the association between Colombia's third wave when the Mu variant was predominant epidemiologically (until 75%) in Colombia and COVID-19 all-cause in-hospital mortality.: Methods: In this retrospective cohort, we included ... ...

    Abstract Objectives: To evaluate the association between Colombia's third wave when the Mu variant was predominant epidemiologically (until 75%) in Colombia and COVID-19 all-cause in-hospital mortality.
    Methods: In this retrospective cohort, we included hospitalized patients ≥18 years with SARS-CoV-2 infection between March 2020 to September 2021 in ten hospitals from three cities in Colombia. Description analysis, survival, and multivariate Cox regression analyses were performed to evaluate the association between the third epidemic wave and in-hospital mortality.
    Results: A total of 25,371 patients were included. The age-stratified time-to-mortality curves showed differences according to epidemic waves in patients ≥75 years (log-rank test p = 0.012). In the multivariate Cox analysis, the third wave was not associated with increased mortality relative to the first wave (aHR 0.95; 95%CI 0.84-1.08), but there was an interaction between age ≥75 years and the third wave finding a lower HR for mortality (aHR 0.56, 95%CI 0.36-0.86).
    Conclusions: We did not find an increase in in-hospital mortality during the third epidemic wave in which the Mu variant was predominant in Colombia. The reduced hazard in mortality in patients ≥75 years hospitalized in the third wave could be explained by the high coverage of SARS-CoV-2 vaccination in this population and patients with underlying conditions.
    MeSH term(s) Humans ; Aged ; Colombia/epidemiology ; COVID-19 Vaccines ; Retrospective Studies ; COVID-19 ; SARS-CoV-2
    Chemical Substances COVID-19 Vaccines
    Language English
    Publishing date 2023-05-09
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 2170891-5
    ISSN 1873-0442 ; 1477-8939
    ISSN (online) 1873-0442
    ISSN 1477-8939
    DOI 10.1016/j.tmaid.2023.102579
    Database MEDical Literature Analysis and Retrieval System OnLINE

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