Person:
San Segundo Acosta, Pablo

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First Name
Pablo
Last Name
San Segundo Acosta
Affiliation
Universidad Complutense de Madrid
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Now showing 1 - 6 of 6
  • Publication
    Identification of tumor-associated antigens with diagnostic ability of colorectal cancer by in-depth immunomic and seroproteomic analysis
    (Elsevier, 2020-03-01) Garranzo Asensio, María; San Segundo Acosta, Pablo; Povés Francés, Carmen; Fernández Aceñero, María Jesús; Martínez Useros, Javier; Montero Calle, Ana; Solís Fernández, Guillermo; Sánchez Martínez, Mari Cruz; Rodríguez, Nuria; Cerón, María Ángeles; Fernández Díez, Servando; Domínguez Muñóz, Gemma; Ríos, Vivian de los; Peláez García, Alberto, Alberto; Guzmán Aránguez, Ana Isabel; Barderas, Rodrigo
    Colorectal cancer (CRC) is the third most common cancer and the second leading cause of cancer related death worldwide. Its diagnosis at early stages would significantly improve the survival of CRC patients. The humoral immune response has been demonstrated useful for cancer diagnosis, predating clinical symptoms up to 3 years. Here, we employed an in-depth seroproteomic approach to identify proteins that elicit a humoral immune response in CRC patients. The seroproteomic approach relied on the immunoprecipitation with patient-derived autoantibodies of proteins from CRC cell lines with different metastatic properties followed by LC-MS/MS. After bioinformatics, we focused on 31 targets of CRC autoantibodies. After WB and IHC validation, ERP44 and TALDO1 showed potential to discriminate disease-free and metastatic CRC patients, and time to recurrence of CRC patients in stage II. Using plasma samples of 30 healthy individuals, 28 premalignant individuals, and 32 CRC patients, nine out of 13 selected targets for seroreactive analysis showed significant diagnostic ability to discriminate either CRC patients or premalignant subjects from controls. Our results suggest that the here defined panel of CRC autoantibodies and their target proteins should be included in CRC blood-based biomarker panels to get a clinically useful blood-based diagnostic signature for CRC detection. Significance: Colorectal cancer is one of the deadliest cancer types mainly due to its late diagnosis. Its early diagnosis, therefore, is of great importance since it would significantly improve the survival of CRC patients. In our work, the in-depth seroproteomic analysis of colorectal cancer using isolated IgGs from colorectal cancer patients and controls and protein extract of colorectal cancer cells provide the identification of valuable biomarkers with diagnostic and prognostic ability of the disease.
  • Publication
    Proteomics techniques for the identification of new biomarkers in chronic disease: alzheimer's disease and allergy to olive pollens as models
    (Universidad Complutense de Madrid, 2021-02-05) San Segundo Acosta, Pablo; Barderas Manchado, Rodrigo; Villalba Díaz, María Teresa
    The term “biomarker” can be defined as any characteristic which can be objectively measured and evaluated as an indicator of normal biological processes, pathogenic processes, orpharmacological responses to a therapeutic intervention. Biomarkers can be highly diverse, and include specific molecules such as proteins (protein biomarkers), which can be used in screening tests for diagnosis. Proteomics consists of the large-scale characterization of all the expressed proteins in a cell, tissue or living organism at a specific moment and condition, using techniques such as two-dimensional electrophoresis (2-DE), mass-spectrometry (MS) and protein microarrays. During the last years, these high-throughput screening techniques have been extensively used for the discovery of multiple protein biomarkers, as they allow for the identification and quantification of a high number of proteins in a single sample and with high sensitivity. Alzheimer’s disease (AD) is a chronic, progressive and unremitting neurodegenerative disorder affecting fundamental brain areas for memory and cognition, mainly the neocortex and the hippocampus. It is the most common form of dementia worldwide, with an estimated prevalence between 10% and 30% in the aging population which is expected to double in the next years. Two main histopathological hallmarks define AD: extracellular amyloid β peptide (Aβ) deposits known as amyloid plaques, and intracellular aggregates of hyperphosphorylated tau known as neurofibrillary tangles (NFTs). Currently, the only useful biomarkers for AD diagnosis are based on cerebrospinal fluid (CSF) analysis and neuroimaging techniques, which restricts their use to specialty clinics. Therefore, AD diagnosis is mainly based on clinical symptoms, sometimes leading to misdiagnosis. Besides, this method fails to detect the disease at early stages. To counter these problems, new biomarkers useable in primary care settings, such as blood-based biomarkers, are needed in the field and are the focus of many research groups worldwide. Allergic diseases, also known as type I hypersensitivity disorders, constitute another group of chronic diseases whose prevalence has alarmingly increased in the population of developed countries. It is estimated that up to 25% of the population of these countries suffer from respiratory allergies such as rhinitis, conjunctivitis and asthma, which involve the production of high-affinity Immunoglobulin E (IgE) antibodies against generally harmless environmental antigens known as aeroallergens. While in tropical areas mites are the main cause of respiratory allergies, in North America and Europe pollen plays a major role in allergic sensitization (pollinosis). In Spain, olive (Olea europaea L.) pollen is the second leading cause of pollinosis after grass pollen, becoming the first one in regions like Andalusia, where olive is extensively cultivated. Besides, the continuous advertising of the Mediterranean diet has boosted olive cultivation in regions of the United States, Japan, China, South Africa and South America, where it will presumably become a main allergenic source. Although olive pollen allergens have been deeply characterized during the last years, some allergens potentially relevant for the diagnosis and management of this allergy have remained unidentified due to technical restrictions and limited genomics and proteomics data...
  • Publication
    “¿Qué es lo que sabemos… sobre Biología”
    (2020-05-18) Batanero Cremades, Eva; Rodríguez Crespo, José Ignacio; San Segundo Acosta, Pablo; Bueno Díaz, Cristina; Parrón Ballesteros, Jorge
    Dada la importancia del inglés y de las tecnologías móviles hoy día, los estudiantes utilizarán dichas tecnologías para reforzar el aprendizaje de Biología, y motivarlos a estudiar, mediante dos actividades: crear test Kahoot en inglés y concursar.
  • Publication
    Phage-Derived and Aberrant HaloTag Peptides Immobilized on Magnetic Microbeads for Amperometric Biosensing of Serum Autoantibodies and Alzheimer's Disease Diagnosis
    (Wiley-VCH, 2021-07-27) Valverde de la Fuente, Alejandro; Montero Calle, Ana; Arévalo Pérez, Beatriz; San Segundo Acosta, Pablo; Serafín González-Carrato, Verónica; Alonso Navarro, Miren; Solís Fernández, Guillermo; Pingarrón Carrazón, José Manuel; Campuzano Ruiz, Susana; Barderas Manchado, Rodrigo
    An electrochemical biosensing platform for serum autoantibodies (AAbs) detection is reported in this work, exploiting for the first time six Alzheimer's disease (AD)-specific phage-derived and frameshift aberrant HaloTag peptides as receptors, immobilized on magnetic microbeads (MBs) surface and captured on disposable electrodes to perform amperometric detection. Operational analytical characteristics and clinical diagnostic ability of the bioplatform were probed in optimized key experimental conditions by analysing serum AAbs of AD patients and healthy subjects. The value of 100% obtained for AUC, sensitivity, and selectivity from the all peptides combined ROC curve, indicate full AD-diagnostic capability of the methodology, which was further implemented, as proof of concept, in a POC multiplexing platform to detect the signature in a single test over clinically actionable times (1 h 15 min), opening great promise for the type of diagnosis and AD patients’ monitoring follow-up currently pursued.
  • Publication
    Identification of tumor-associated antigens with diagnostic ability of colorectal cancer by in-depth immunomic and seroproteomic analysis
    (Elsevier, 2020-03) Garranzo Asensio, María; San Segundo Acosta, Pablo; Povés Francés, Carmen; Fernández Aceñero, María Jesús; Martínez Useros, Javier; Montero Calle, Ana; Solís Fernández, Guillermo; Sánchez Martínez, Maricruz; Rodríguez Salas, Nuria; Cerón, María Ángeles; Fernández Díez, Servando; Domínguez Muñóz, Gemma; Ríos, Vivian de los; Peláez García, Alberto, Alberto; Guzmán Aránguez, Ana Isabel; Barderas Manchado, Rodrigo
    Colorectal cancer (CRC) is the third most common cancer and the second leading cause of cancer related death worldwide. Its diagnosis at early stages would significantly improve the survival of CRC patients. The humoral immune response has been demonstrated useful for cancer diagnosis, predating clinical symptoms up to 3 years. Here, we employed an in-depth seroproteomic approach to identify proteins that elicit a humoral immune response in CRC patients. The seroproteomic approach relied on the immunoprecipitation with patient-derived autoantibodies of proteins from CRC cell lines with different metastatic properties followed by LC-MS/MS. After bioinformatics, we focused on 31 targets of CRC autoantibodies. After WB and IHC validation, ERP44 and TALDO1 showed potential to discriminate disease-free and metastatic CRC patients, and time to recurrence of CRC patients in stage II. Using plasma samples of 30 healthy individuals, 28 premalignant individuals, and 32 CRC patients, nine out of 13 selected targets for seroreactive analysis showed significant diagnostic ability to discriminate either CRC patients or premalignant subjects from controls. Our results suggest that the here defined panel of CRC autoantibodies and their target proteins should be included in CRC blood-based biomarker panels to get a clinically useful blood-based diagnostic signature for CRC detection. Significance: Colorectal cancer is one of the deadliest cancer types mainly due to its late diagnosis. Its early diagnosis, therefore, is of great importance since it would significantly improve the survival of CRC patients. In our work, the in-depth seroproteomic analysis of colorectal cancer using isolated IgGs from colorectal cancer patients and controls and protein extract of colorectal cancer cells provide the identification of valuable biomarkers with diagnostic and prognostic ability of the disease.
  • Publication
    Biophysical and biological impact on the structure and IgE-binding of the interaction of the olive pollen allergen Ole e 7 with lipids
    (Elsevier, 2020-03-04) Carmen Oeo-Santos; López Rodríguez, Juan Carlos; García Mouton, Cristina; San Segundo Acosta, Pablo; Aurora Jurado; Carmen Moreno-Aguilar; García Álvarez, María Begoña; Pérez Gil, Jesús; Villalba Díaz, María Teresa; Barderas Manchado, Rodrigo; Cruz Rodríguez, Antonio
    Ole e 7 allergen from Olea europaea pollen possesses a major clinical relevance because it produces severe symptoms, such as anaphylaxis, in allergic patients exposed to high olive pollen counts. Ole e 7 is a non-specific lipid transfer protein (nsLTP) characterized by the presence of a tunnel-like hydrophobic cavity, which may be suitable for hosting and, thus, transporting lipids -as it has been described for other nsLTPs-. The identification of the primary amino acid sequence of Ole e 7, and its production as a recombinant allergen, allowed characterizing its lipid-binding properties and its effect at air-liquid interfaces. Fluorescence and interferometry experiments were performed using different phospholipid molecular species and free fatty acids to analyse the lipid-binding ability and specificity of the allergen. Molecular modelling of the allergen was used to determine the potential regions involved in lipid interaction. Changes in Ole e 7 structure after lipid interaction were analysed by circular dichroism. Changes in the IgE binding upon ligand interaction were determined by ELISA. Wilhelmy balance measurements and fluorescence surfactant adsorption tests were performed to analyse the surface activity of the allergen. Using these different approaches, we have demonstrated the ability of Ole e 7 to interact and bind to a wide range of lipids, especially negatively charged phospholipids and oleic acid. We have also identified the protein structural regions and the residues potentially involved in that interaction, suggesting how lipid-protein interactions could define the behaviour of the allergen once inhaled at the airways.