Mitochondrial physiology

As the knowledge base and importance of mitochondrial physiology to evolution, health and disease expands, the necessity for harmonizing the terminology concerning mitochondrial respiratory states and rates has become increasingly apparent. The chemiosmotic theory establishes the mechanism of energy transformation and coupling in oxidative phosphorylation. The unifying concept of the protonmotive force provides the framework for developing a consistent theoretical foundation of mitochondrial physiology and bioenergetics. We follow the latest SI guidelines and those of the International Union of Pure and Applied Chemistry (IUPAC) on terminology in physical chemistry, extended by considerations of open systems and thermodynamics of irreversible processes. The concept-driven constructive terminology incorporates the meaning of each quantity and aligns concepts and symbols with the nomenclature of classical bioenergetics. We endeavour to provide a balanced view of mitochondrial respiratory control and a critical discussion on reporting data of mitochondrial respiration in terms of metabolic flows and fluxes. Uniform standards for evaluation of respiratory states and rates will ultimately contribute to reproducibility between laboratories and thus support the development of data repositories of mitochondrial respiratory function in species, tissues, and cells. Clarity of concept and consistency of nomenclature facilitate effective transdisciplinary communication, education, and ultimately further discovery

Mitochondrial physiology

As the knowledge base and importance of mitochondrial physiology to evolution, health and disease expands, the necessity for harmonizing the terminology concerning mitochondrial respiratory states and rates has become increasingly apparent. The chemiosmotic theory establishes the mechanism of energy transformation and coupling in oxidative phosphorylation. The unifying concept of the protonmotive force provides the framework for developing a consistent theoretical foundation of mitochondrial physiology and bioenergetics. We follow the latest SI guidelines and those of the International Union of Pure and Applied Chemistry (IUPAC) on terminology in physical chemistry, extended by considerations of open systems and thermodynamics of irreversible processes. The concept-driven constructive terminology incorporates the meaning of each quantity and aligns concepts and symbols with the nomenclature of classical bioenergetics. We endeavour to provide a balanced view of mitochondrial respiratory control and a critical discussion on reporting data of mitochondrial respiration in terms of metabolic flows and fluxes. Uniform standards for evaluation of respiratory states and rates will ultimately contribute to reproducibility between laboratories and thus support the development of data repositories of mitochondrial respiratory function in species, tissues, and cells. Clarity of concept and consistency of nomenclature facilitate effective transdisciplinary communication, education, and ultimately further discovery

The prognostic role of CD8+ T lymphocytes in childhood adrenocortical carcinomas compared to Ki-67, PD-1, PD-L1, and the Weiss score

Adrenocortical carcinoma (ACC) is a rare disease among children. Our goal was to identify prognostic biomarkers in 48 primary ACCs from children (2.83 ± 2.3 y; mean age ± SD) by evaluating the tumor stage and outcome for an age of diagnosis before or after 3 years, and association with ACC cluster of differentiation 8 positive (CD8+) cytotoxic T lymphocytes (CD8+-CTL) and Ki-67 immunohistochemical expression (IHC). Programmed death 1(PD-1)/Programmed death-ligand 1 (PD-L1) immunohistochemistry (IHC) in ACC was analyzed in a second, partially overlapping cohort (N = 19) with a similar mean age. All patients and control children were carriers of the germline TP53 R337H mutation. Survival without recurrence for less than 3 years and death unrelated to disease were excluded. Higher counts of CD8+-CTL were associated with patients diagnosed with ACC at a younger age and stage I, whereas a higher percentage of the Ki-67 labeling index (LI) and Weiss scores did not differentiate disease free survival (DFS) in children younger than 3 years old. No PD-1 staining was observed, whereas weakly PD-L1-positive immune cells were found in 4/19 (21%) of the ACC samples studied. A high CD8+-CTL count in ACC of surviving children is compelling evidence of an immune response against the disease. A better understanding of the options for enhancement of targets for CD8+ T cell recognition may provide insights for future pre-clinical studies

Publicação de trabalhos científicos apresentados em Congresso de Trauma no Brasil

OBJETIVO: Analisar a proporção de trabalhos apresentados no XXI Panamerican Congress of Trauma, VIII Congresso da Sociedade Brasileira de Atendimento Integrado ao Traumatizado (SBAIT) e X Congresso Brasileiro das Ligas do Trauma (CoLT) que foram publicados integralmente. MÉTODOS: Nos eventos citados que foram sediados em Campinas, em 2008, foram apresentados e publicados os resumos de 347 trabalhos. Para avaliar a proporçãode trabalhos completos publicados foi realizado um estudo retrospectivo observacional consultando as bases de dados biomédicas PubMed e SciELO, com apoio do Google, a partir do título dos resumos e da listagem de autores. RESULTADOS: Dos 347 trabalhos considerados, 25 (7,3%) eram de serviços estrangeiros e 322 (92,7%) de nacionais. Dez (2,9%) trabalhos foram publicados, dos quais, seis (1,7%) da área de enfermagem e quatro (1,2%) de medicina. Dentre estes, foram identificados quatro publicações de tese e apenas um dos trabalhos internacionais foi publicado. CONCLUSÃO: Apesar de haver um grande número de trabalhos apresentados em congressos de trauma no Brasil, as publicações nesta área são raras. A academia e as sociedades de cirurgia precisam estimular a submissão de trabalhos científicos mesmo antes da apresentação em congressos a fim de serem avaliados para publicação em revistas indexadas

A simple and fast protocol for the protein complex immunoprecipitation (Co-IP) of effector : host protein complexes

Plant pathogens are responsible for enormous damage in natural and cultured ecosystems. One strategy most pathogenic organisms follow is the secretion of effector proteins that manipulate the host immune system to suppress defense responses. There is considerable interest in finding host targets of pathogen effectors as this helps to shape our understanding of how those proteins work in planta. The presented protocol describes a protein complex immunoprecipitation method aimed at verifying protein–protein interactions derived from protein complementation assays like Yeast-two-Hybrid