Video Experimental Relacionado
Updated: Jun 21, 2026

08:23
Comet Assay as an Indirect Measure of Systemic Oxidative Stress
Published on: May 22, 2015
Oxidación anormal del azufre en el lupus eritematoso sistémico
C Gordon1, H Bradley, R H Waring
1Department of Rheumatology, University of Birmingham, UK.
Lancet (London, England)
|January 4, 1992
Resumen
Los pacientes con lupus eritematoso sistémico (LES) presentan deterioro de la S-oxidación, una vía clave del metabolismo del azufre. Este estudio pone de relieve una clara diferencia bioquímica en el metabolismo del azufre entre el LES y la artritis reumatoide.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Inmunología Inmunología.
- Las vías metabólicas.
Sus antecedentes:
- El metabolismo del azufre juega un papel crucial en los sistemas biológicos.
- Las alteraciones en las vías metabólicas están implicadas en enfermedades autoinmunes como el LES.
- Comprender el metabolismo del azufre en el LES puede revelar biomarcadores específicos de la enfermedad.
Objetivo del estudio:
- Investigar la actividad de la vía de oxidación S del metabolismo del azufre en pacientes con lupus eritematoso sistémico (LES).
- Para comparar el metabolismo del azufre en pacientes con LES con controles sanos.
- Para diferenciar los perfiles de metabolismo del azufre entre el LES y la artritis reumatoide (AR).
Principales métodos:
- Utilizado S-carboxil-L-metilcisteína como una sonda para evaluar la actividad de S-oxidación.
- Ratios medidos de sustrato/producto para la cisteína oxigenasa (cisteína/sulfato plasmático).
- Evaluó la vía de S-metilación catalizada por la tiolmetiltransferasa.
Principales resultados:
- Una mayoría significativa de los pacientes con LES (71%) mostró alteración de la sulfoxidación.
- El 25% de los pacientes con LES no mostró prácticamente ninguna producción de sulfóxido, en comparación con el 4% en los controles.
- La vía de la cisteína oxigenasa fue significativamente regulada al alza en pacientes con LES (p < 0,00001).
- La vía de S-metilación no se vio afectada en los pacientes con LES.
Conclusiones:
- El LES se caracteriza por un deterioro de la S-oxidación, una vía clave en el metabolismo del azufre.
- La vía de S-metilación no se ve afectada en pacientes con LES.
- El metabolismo del azufre exhibe diferencias claras entre el LES y la AR, con ambas vías alteradas en la AR.
Videos de Conceptos Relacionados
Pleiotropy
Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
Pigmentation
The color of the skin is influenced by a number of pigments, including melanin, carotene, and hemoglobin. Recall that melanin is produced by cells called melanocytes, which are found scattered throughout the stratum basale of the epidermis. The melanin is transferred to the keratinocytes via melanosomes.
Melanin occurs in two primary forms: eumelanin that provides black and brown pigment and pheomelanin that provides red color. Dark-skinned individuals produce more melanin than those with pale...
Melanin occurs in two primary forms: eumelanin that provides black and brown pigment and pheomelanin that provides red color. Dark-skinned individuals produce more melanin than those with pale...
Changes in Skin Color: Clinical Perspectives
The first thing a clinician sees is the skin, so the examination of the skin should be part of any thorough physical examination. Most skin disorders are relatively benign, but a few, including melanomas, can be fatal if untreated. A couple of the more noticeable disorders, albinism and vitiligo, affect the appearance of the skin and its accessory organs.
Albinism
Albinism is a genetic disorder that affects (completely or partially) the coloring of skin, hair, and eyes. The defect is primarily...
Albinism
Albinism is a genetic disorder that affects (completely or partially) the coloring of skin, hair, and eyes. The defect is primarily...
Skin Diseases and Disorders
Skin is the first line of defense and encounters a variety of microbes. Some pathogenic strains are often the cause of a broad range of infections of the skin and other body systems. These conditions can affect people of all ages and may have different causes, including genetic factors, infections, autoimmune reactions, environmental factors, and lifestyle choices.
Gram-positive Staphylococcus spp. and Streptococcus spp. are responsible for many of the most common skin infections. However, many...
Gram-positive Staphylococcus spp. and Streptococcus spp. are responsible for many of the most common skin infections. However, many...
Imperfections in Crystal Structure: Non-Stoichiometric Defects
Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
Sulfur Assimilation
Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to become...

