LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 101

Search options

  1. Article ; Online: Selective Late-Stage Functionalization of Tryptophan-Containing Peptides To Facilitate Bioorthogonal Tetrazine Ligation.

    Mupparapu, Nagaraju / Syed, Basir / Nguyen, Diem N / Vo, Thao H / Trujillo, Angelica / Elshahawi, Sherif I

    Organic letters

    2024  Volume 26, Issue 12, Page(s) 2489–2494

    Abstract: Site-selective modification of complex peptides and the functionalization of their C-H bonds hold great promise for expanding their use in therapeutics and biomedical research. Herein, we leverage the power of late-stage chemoenzymatic catalysis using an ...

    Abstract Site-selective modification of complex peptides and the functionalization of their C-H bonds hold great promise for expanding their use in therapeutics and biomedical research. Herein, we leverage the power of late-stage chemoenzymatic catalysis using an indole prenyltransferase (IPT) enzyme and alkyl diphosphates to specifically modify the indole ring of tryptophan in clinically relevant peptides. Furthermore, the installed handle enables bioorthogonal click chemistry through an inverse electron-demand Diels-Alder (IEDDA) reaction with a biotin-conjugated tetrazine probe.
    MeSH term(s) Tryptophan ; Peptides ; Cycloaddition Reaction ; Heterocyclic Compounds ; Indoles
    Chemical Substances Tryptophan (8DUH1N11BX) ; Peptides ; Heterocyclic Compounds ; Indoles
    Language English
    Publishing date 2024-03-18
    Publishing country United States
    Document type Journal Article
    ISSN 1523-7052
    ISSN (online) 1523-7052
    DOI 10.1021/acs.orglett.4c00709
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  2. Article ; Online: Characterization of sperm motility and testosterone secretion in the

    Muñoz de la Torre, Luz Patricia / Trujillo Hernández, Angélica / Eguibar, José Ramón / Cortés, Carmen / Morales-Ledesma, Leticia

    Animal reproduction

    2023  Volume 20, Issue 3, Page(s) e20220102

    Abstract: Presently, demyelinating diseases have been reported to affect the reproductive life of patients who suffer from them, but the progression of the alterations is unknown, especially in men. To better understand these effects, it is necessary to perform ... ...

    Abstract Presently, demyelinating diseases have been reported to affect the reproductive life of patients who suffer from them, but the progression of the alterations is unknown, especially in men. To better understand these effects, it is necessary to perform studies in animal models, such as the male
    Language English
    Publishing date 2023-10-30
    Publishing country Brazil
    Document type Journal Article
    ZDB-ID 2227229-X
    ISSN 1984-3143 ; 1984-3143
    ISSN (online) 1984-3143
    ISSN 1984-3143
    DOI 10.1590/1984-3143-AR2022-0102
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  3. Article ; Online: Neurotoxicity of low-level lead exposure: History, mechanisms of action, and behavioral effects in humans and preclinical models.

    Rocha, Angelica / Trujillo, Keith A

    Neurotoxicology

    2019  Volume 73, Page(s) 58–80

    Abstract: Lead is a neurotoxin that produces long-term, perhaps irreversible, effects on health and well-being. This article summarizes clinical and preclinical studies that have employed a variety of research techniques to examine the neurotoxic effects of low ... ...

    Abstract Lead is a neurotoxin that produces long-term, perhaps irreversible, effects on health and well-being. This article summarizes clinical and preclinical studies that have employed a variety of research techniques to examine the neurotoxic effects of low levels of lead exposure. A historical perspective is presented, followed by an overview of studies that examined behavioral and cognitive outcomes. In addition, a short summary of potential mechanisms of action is provided with a focus on calcium-dependent processes. The current level of concern, or reference level, set by the CDC is 5 μg/dL of lead in blood and a revision to 3.5 μg/dL has been suggested. However, levels of lead below 3 μg/dL have been shown to produce diminished cognitive function and maladaptive behavior in humans and animal models. Because much of the research has focused on higher concentrations of lead, work on low concentrations is needed to better understand the neurobehavioral effects and mechanisms of action of this neurotoxic metal.
    MeSH term(s) Adolescent ; Adolescent Behavior/drug effects ; Adolescent Development/drug effects ; Adult ; Age Factors ; Aged ; Animals ; Brain/drug effects ; Brain/growth & development ; Child ; Child Behavior/drug effects ; Child Development/drug effects ; Child, Preschool ; Cognition/drug effects ; Dose-Response Relationship, Drug ; History, 20th Century ; History, 21st Century ; Humans ; Lead Poisoning, Nervous System, Adult/history ; Lead Poisoning, Nervous System, Adult/physiopathology ; Lead Poisoning, Nervous System, Adult/psychology ; Lead Poisoning, Nervous System, Childhood/history ; Lead Poisoning, Nervous System, Childhood/physiopathology ; Lead Poisoning, Nervous System, Childhood/psychology ; Mice ; Middle Aged ; Rats ; Risk Assessment ; Risk Factors ; Toxicity Tests ; Young Adult
    Language English
    Publishing date 2019-03-02
    Publishing country Netherlands
    Document type Historical Article ; Journal Article ; Research Support, N.I.H., Extramural ; Research Support, U.S. Gov't, Non-P.H.S. ; Review
    ZDB-ID 800820-6
    ISSN 1872-9711 ; 0161-813X
    ISSN (online) 1872-9711
    ISSN 0161-813X
    DOI 10.1016/j.neuro.2019.02.021
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  4. Article ; Online: Pelvic lymph node involvement and risk of recurrence in HPV-associated endocervical adenocarcinoma stage IA2-IB1 according to Silva's system in two Colombian cancer centers.

    Hernández, Jairo Alonso / Rodríguez, Juliana / Rendón, Gabriel / Trujillo, Lina Maria / Beltrán, María Islena / Mantilla, Carolina / Echeverry, Carolina / Mendoza, María Angélica / Gil, Mónica / Núñez, Marcela / Hernández, Marcela / Peralta, Jonathan / Pareja, René

    International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics

    2024  

    Abstract: Objective: To compare the pelvic lymph node involvement and risk of recurrence in patients with human papillomavirus (HPV)-associated endocervical adenocarcinoma stage IA2-IB1 undergoing hysterectomy and/or trachelectomy plus lymphadenectomy, according ... ...

    Abstract Objective: To compare the pelvic lymph node involvement and risk of recurrence in patients with human papillomavirus (HPV)-associated endocervical adenocarcinoma stage IA2-IB1 undergoing hysterectomy and/or trachelectomy plus lymphadenectomy, according to Silva's classification system.
    Methods: A retrospective cohort study was performed in two Colombian cancer centers. The cases were classified according to the Silva classification system. Clinical, surgical, and histopathological variables were evaluated. Recurrence risk was analyzed by patterns A, B, or C. A logistic regression model was performed for tumor recurrence. The Kaplan-Meier method was used to estimate overall survival and disease-free survival (DFS). A weighted kappa was performed to determine the degree of concordance between pathologists.
    Results: A total of 100 patients were identified, 33% pattern A, 29% pattern B, and 38% pattern C. The median follow-up time was 42.5 months. No evidence of lymph node involvement was found in patients classified as A and B, while in the C pattern was observed in 15.8% (n = 6) of cases (P < 0.01). There were 7% of cases with recurrent disease, of which 71.5% corresponded to type C pattern. Patients with Silva pattern B and C had 1.22- and 4.46-fold increased risk of relapse, respectively, compared with pattern A. The 5-year DFS values by group were 100%, 96.1%, and 80.3% for patterns A, B, and C, respectively.
    Conclusion: For patients with early-stage HPV-associated endocervical adenocarcinoma, the type C pattern presented more lymph node involvement and risk of recurrence compared to the A and B patterns. The concordance in diagnosis of different Silva's patterns by independents pathologists were good.
    Language English
    Publishing date 2024-03-28
    Publishing country United States
    Document type Journal Article
    ZDB-ID 80149-5
    ISSN 1879-3479 ; 0020-7292
    ISSN (online) 1879-3479
    ISSN 0020-7292
    DOI 10.1002/ijgo.15482
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  5. Article ; Online: Systematic Analysis of Metabolic Bottlenecks in the Methylerythritol 4-Phosphate (MEP) Pathway of Zymomonas mobilis.

    Khana, Daven B / Tatli, Mehmet / Rivera Vazquez, Julio / Weraduwage, Sarathi M / Stern, Noah / Hebert, Alexander S / Angelica Trujillo, Edna / Stevenson, David M / Coon, Joshua J / Sharky, Thomas D / Amador-Noguez, Daniel

    mSystems

    2023  Volume 8, Issue 2, Page(s) e0009223

    Abstract: Zymomonas mobilis is an industrially relevant aerotolerant anaerobic bacterium that can convert up to 96% of consumed glucose to ethanol. This highly catabolic metabolism could be leveraged to produce isoprenoid-based bioproducts via the methylerythritol ...

    Abstract Zymomonas mobilis is an industrially relevant aerotolerant anaerobic bacterium that can convert up to 96% of consumed glucose to ethanol. This highly catabolic metabolism could be leveraged to produce isoprenoid-based bioproducts via the methylerythritol 4-phosphate (MEP) pathway, but we currently have limited knowledge concerning the metabolic constraints of this pathway in Z. mobilis. Here, we performed an initial investigation of the metabolic bottlenecks within the MEP pathway of Z. mobilis using enzyme overexpression strains and quantitative metabolomics. Our analysis revealed that 1-deoxy-d-xylulose 5-phosphate synthase (DXS) represents the first enzymatic bottleneck in the Z. mobilis MEP pathway. DXS overexpression triggered large increases in the intracellular levels of the first five MEP pathway intermediates, of which the buildup in 2-C-methyl-d-erythritol 2,4-cyclodiphosphate (MEcDP) was the most substantial. The combined overexpression of DXS, 4-hydroxy-3-methylbut-2-enyl diphosphate (HMBDP) synthase (IspG), and HMBDP reductase (IspH) mitigated the bottleneck at MEcDP and mobilized carbon to downstream MEP pathway intermediates, indicating that IspG and IspH activity become the primary pathway constraints during DXS overexpression. Finally, we overexpressed DXS with other native MEP enzymes and a heterologous isoprene synthase and showed that isoprene can be used as a carbon sink in the Z. mobilis MEP pathway. By revealing key bottlenecks within the MEP pathway of Z. mobilis, this study will aid future engineering efforts aimed at developing this bacterium for industrial isoprenoid production.
    MeSH term(s) Zymomonas/genetics ; Biofuels ; Base Composition ; Sequence Analysis, DNA ; Phylogeny ; RNA, Ribosomal, 16S/metabolism ; Terpenes/metabolism ; Phosphates/metabolism
    Chemical Substances Biofuels ; RNA, Ribosomal, 16S ; 2-C-methylerythritol 4-phosphate ; Terpenes ; Phosphates
    Language English
    Publishing date 2023-03-30
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, U.S. Gov't, Non-P.H.S.
    ISSN 2379-5077
    ISSN (online) 2379-5077
    DOI 10.1128/msystems.00092-23
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  6. Article ; Online: Obese female Zucker rats (fa/fa) exhibit dendritic retraction in neurons in the ventromedial hypothalamic nucleus.

    Bravo Durán, Dolores Adriana / Barreda Guzmán, Selina Jocelyn / Trujillo Hernández, Angélica / Silva Gómez, Adriana Berenice

    Journal of chemical neuroanatomy

    2021  Volume 113, Page(s) 101919

    Abstract: The ventromedial hypothalamic nucleus (VMH) is located in the tuberal region of the hypothalamus and is traditionally considered the satiety center. In obese Zucker rats, which express a mutation in the leptin receptor gene and exhibit obesity from the ... ...

    Abstract The ventromedial hypothalamic nucleus (VMH) is located in the tuberal region of the hypothalamus and is traditionally considered the satiety center. In obese Zucker rats, which express a mutation in the leptin receptor gene and exhibit obesity from the first weeks of life, the morphology of VMH neurons is unknown. In the present study, we found that the dendritic length of VMH neurons in obese Zucker rats was significantly shorter than that in Long Evans rats. This finding allows us to suggest that obese Zucker rats exhibit both neuronal metabolic alterations related to leptin and a reduction in the flow of information within the neuronal circuits in which the VMH nucleus participates to regulate foraging.
    MeSH term(s) Animals ; Cell Shape/physiology ; Dendrites/pathology ; Neurons/pathology ; Obesity/pathology ; Rats ; Rats, Zucker ; Ventromedial Hypothalamic Nucleus/pathology
    Language English
    Publishing date 2021-01-23
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 639443-7
    ISSN 1873-6300 ; 0891-0618
    ISSN (online) 1873-6300
    ISSN 0891-0618
    DOI 10.1016/j.jchemneu.2021.101919
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  7. Article: Germline Variants in Cancer Genes from Young Breast Cancer Mexican Patients.

    Gómez-Flores-Ramos, Liliana / Barraza-Arellano, Angélica Leticia / Mohar, Alejandro / Trujillo-Martínez, Miguel / Grimaldo, Lizbeth / Ortiz-Lopez, Rocío / Treviño, Víctor

    Cancers

    2022  Volume 14, Issue 7

    Abstract: Breast cancer (BC) is one of the most frequent cancer types in women worldwide. About 7% is diagnosed in young women (YBC) less than 40 years old. In Mexico, however, YBC reaches 15% suggesting a higher genetic susceptibility. There have been some ... ...

    Abstract Breast cancer (BC) is one of the most frequent cancer types in women worldwide. About 7% is diagnosed in young women (YBC) less than 40 years old. In Mexico, however, YBC reaches 15% suggesting a higher genetic susceptibility. There have been some reports of germline variants in YBC across the world. However, there is only one report from a Mexican population, which is not restricted by age and limited to a panel of 143 genes resulting in 15% of patients carrying putatively pathogenic variants. Nevertheless, expanding the analysis to whole exome involves using more complex tools to determine which genes and variants could be pathogenic. We used germline whole exome sequencing combined with the PeCanPie tool to analyze exome variants in 115 YBC patients. Our results showed that we were able to identify 49 high likely pathogenic variants involving 40 genes on 34% of patients. We noted many genes already reported in BC and YBC worldwide, such as
    Language English
    Publishing date 2022-03-24
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2527080-1
    ISSN 2072-6694
    ISSN 2072-6694
    DOI 10.3390/cancers14071647
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  8. Article ; Online: Inflammation: A Target for Treatment in Spinal Cord Injury.

    Freyermuth-Trujillo, Ximena / Segura-Uribe, Julia J / Salgado-Ceballos, Hermelinda / Orozco-Barrios, Carlos E / Coyoy-Salgado, Angélica

    Cells

    2022  Volume 11, Issue 17

    Abstract: Spinal cord injury (SCI) is a significant cause of disability, and treatment alternatives that generate beneficial outcomes and have no side effects are urgently needed. SCI may be treatable if intervention is initiated promptly. Therefore, several ... ...

    Abstract Spinal cord injury (SCI) is a significant cause of disability, and treatment alternatives that generate beneficial outcomes and have no side effects are urgently needed. SCI may be treatable if intervention is initiated promptly. Therefore, several treatment proposals are currently being evaluated. Inflammation is part of a complex physiological response to injury or harmful stimuli induced by mechanical, chemical, or immunological agents. Neuroinflammation is one of the principal secondary changes following SCI and plays a crucial role in modulating the pathological progression of acute and chronic SCI. This review describes the main inflammatory events occurring after SCI and discusses recently proposed potential treatments and therapeutic agents that regulate inflammation after insult in animal models.
    MeSH term(s) Animals ; Immunologic Factors/therapeutic use ; Inflammation/complications ; Spinal Cord Injuries/complications ; Spinal Cord Injuries/drug therapy
    Chemical Substances Immunologic Factors
    Language English
    Publishing date 2022-08-29
    Publishing country Switzerland
    Document type Journal Article ; Review ; Research Support, Non-U.S. Gov't
    ZDB-ID 2661518-6
    ISSN 2073-4409 ; 2073-4409
    ISSN (online) 2073-4409
    ISSN 2073-4409
    DOI 10.3390/cells11172692
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  9. Article ; Online: Mating-induced analgesia is dependent of copulatory male pattern in high- and low- yawning male rats.

    Gómora-Arrati, Porfirio / Cortes, Carmen / Trujillo, Angélica / Encarnación-Sánchez, José L / Galicia-Aguas, Yadira L / González-Flores, Oscar / Eguibar, Jose R

    Physiology & behavior

    2022  Volume 246, Page(s) 113694

    Abstract: Mating behavior in rodents can modulate pain sensations in both sexes. In males, the execution of mounts, intromissions, and ejaculations induced a progressive increase in their vocalization thresholds induced by tail shocks and other types of noxious ... ...

    Abstract Mating behavior in rodents can modulate pain sensations in both sexes. In males, the execution of mounts, intromissions, and ejaculations induced a progressive increase in their vocalization thresholds induced by tail shocks and other types of noxious stimuli. We selectively inbred two sublines from Sprague-Dawley (SD) rats that differed in their spontaneous yawning frequency. The high-yawning (HY) subline had a mean of 20 yawns/h and a different pattern of sexual behavior characterized by longer interintromission intervals and more sexual bouts that delayed ejaculation. The low-yawning (LY) subline and SD rats yawned as a mean 2 and 1 yawns/h, respectively. So, we determine mating-induced analgesia in HY, LY, and SD male rats by measuring vocalization thresholds in response to noxious electric tail shocks. Our results showed that the magnitude of mating-induced analgesia was lower in HY and LY rats with respect to SD rats. When the rats performed different components of male sexual pattern, both sublines exhibited a significantly lower increase in their vocalization thresholds with respect to SD rats-being sublines less responsive regarding mating-induced analgesia. Pain modulation mechanisms depend on responses to stress, so the low levels of analgesia obtained in the yawning sublines may be due either to differences in their response to stress in other paradigms, or to atypical performance of male sexual behavior during mating, an event which as a stressful event in rats. Therefore, the yawning sublines are a suitable model for analyzing how a different temporal pattern in the display of male sexual behavior affects analgesia mechanisms. Our results concur with Wistar rats with different endophenotypes that could apply to humans as well.
    MeSH term(s) Analgesia ; Animals ; Copulation ; Ejaculation ; Female ; Male ; Pain ; Rats ; Rats, Sprague-Dawley ; Rats, Wistar ; Yawning/physiology
    Language English
    Publishing date 2022-01-05
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 3907-x
    ISSN 1873-507X ; 0031-9384
    ISSN (online) 1873-507X
    ISSN 0031-9384
    DOI 10.1016/j.physbeh.2022.113694
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  10. Article ; Online: Sex-specific hypothalamic expression of kisspeptin, gonadotropin releasing hormone, and kisspeptin receptor in progressive demyelination model.

    Muñoz de la Torre, Luz Patricia / Trujillo Hernández, Angélica / Eguibar, Jose R / Cortés, Carmen / Morales-Ledesma, Leticia

    Journal of chemical neuroanatomy

    2022  Volume 123, Page(s) 102120

    Abstract: Demyelinating diseases, such as multiple sclerosis, decrease the quality of life of patients and can affect reproduction. Assisted reproductive therapies are available, which although effective, aggravate motor symptoms. For this reason, it is important ... ...

    Abstract Demyelinating diseases, such as multiple sclerosis, decrease the quality of life of patients and can affect reproduction. Assisted reproductive therapies are available, which although effective, aggravate motor symptoms. For this reason, it is important to determine how the control of the hypothalamus-pituitary-gonadal axis is affected in order to develop better strategies for these patients. One way to determine this is using animal models such as the taiep rat, which shows progressive demyelination of the central nervous system, and was used in the present study to characterize the expression of gonadotrophin-releasing hormone (GnRH), Kisspeptin, and kisspeptin receptor (Kiss1R) and luteinizing hormone (LH) secretion. The expression of kisspeptin, GnRH, and Kiss1R was determined at the hypothalamic level by immunofluorescence and serum LH levels were determined by ELISA. The expression of kisspeptin at the hypothalamic level showed sexual dimorphism, where there was an increase in males and a decrease in females during oestrus. There was no change in the expression of GnRH or kisspeptin receptor, regardless of sex. However, a decrease in serum LH concentration was observed in both sexes. The taiep rat showed changes in the expression of kisspeptin at the hypothalamic level. These changes are different from those reported in the literature with the use of animals with experimental allergic encephalomyelitis, this is because both animal models represent different degrees of progression of multiple sclerosis. Our results suggest that the effects on the hypothalamus-pituitary-gonadal axis depend on the differences between the demyelinating processes, their progression, and even individual factors, and it is thus important that fertility treatments are individualized to maximize therapeutic effects.
    MeSH term(s) Animals ; Demyelinating Diseases/metabolism ; Demyelinating Diseases/pathology ; Female ; Gonadotropin-Releasing Hormone/biosynthesis ; Gonadotropin-Releasing Hormone/metabolism ; Hypothalamus/metabolism ; Kisspeptins/biosynthesis ; Luteinizing Hormone/blood ; Male ; Multiple Sclerosis/metabolism ; Multiple Sclerosis/pathology ; Quality of Life ; Rats ; Receptors, Kisspeptin-1/biosynthesis
    Chemical Substances Kiss1r protein, mouse ; Kisspeptins ; Receptors, Kisspeptin-1 ; Gonadotropin-Releasing Hormone (33515-09-2) ; Luteinizing Hormone (9002-67-9)
    Language English
    Publishing date 2022-06-16
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 639443-7
    ISSN 1873-6300 ; 0891-0618
    ISSN (online) 1873-6300
    ISSN 0891-0618
    DOI 10.1016/j.jchemneu.2022.102120
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

To top