Video Experimental Relacionado
Updated: Aug 18, 2026
08:08
Isolation and Activation of Murine Lymphocytes
Published on: October 30, 2016
Regulación de la expresión del proto-oncogén bcl-2 durante la proliferación normal de linfocitos humanos
Science (New York, N.Y.)
|June 5, 1987
Resumen
Los protooncogenes bcl-2 y c-myc están involucrados en los linfomas de células B. Los niveles de ARN mensajero Bcl-2 están regulados principalmente por la transcripción, a diferencia de c-myc.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Oncología Oncología Oncología.
- Inmunología Inmunología.
Sus antecedentes:
- Los protooncogenes bcl-2 y c-myc están implicados en los linfomas de células B.
- Su yuxtaposición con el locus de cadena pesada de inmunoglobulina conduce a una alta acumulación de ARN mensajero.
- El papel exacto de bcl-2 y c-myc en la tumorigénesis sigue sin estar claro.
Objetivo del estudio:
- Para investigar la regulación de la expresión del proto-oncogén bcl-2 y c-myc.
- Para comparar los mecanismos reguladores de bcl-2 y c-myc en los linfocitos.
Principales métodos:
- Análisis de la expresión de proto-oncogenes en linfocitos B y T humanos normales.
- Estimulación de los linfocitos con mitógenos para inducir la proliferación.
- Comparación de la regulación del ARN mensajero entre bcl-2 y c-myc.
Principales resultados:
- Tanto los protooncogenes bcl-2 como los c-myc se expresan en linfocitos humanos estimulados.
- La expresión de c-myc se induce rápidamente tras la estimulación de la proliferación.
- Los niveles de ARN mensajero bcl-2 se regulan principalmente a través de mecanismos de transcripción, que difieren de los de c-myc.
Conclusiones:
- La expresión del proto-oncogén está regulada diferencialmente en los linfocitos.
- El control de la transcripción es el mecanismo principal para la regulación del ARN mensajero bcl-2.
- Comprender estas diferencias regulatorias puede ofrecer información sobre el desarrollo del linfoma de células B.
Videos de Conceptos Relacionados
01:23Negative Regulator Molecules
Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
02:34Inhibition of Cdk Activity
The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
02:38Mitogens and the Cell Cycle
Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...
02:23Abnormal Proliferation
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...
01:31The Intrinsic Apoptotic Pathway
Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
01:27Molecular Factors Affecting Cell Division
Several external and internal factors influence the initiation and inhibition of cell division. For instance, the death of nearby cells or the release of human growth hormone (hGH) promotes cell division. In contrast, lack of hGH or crowding of cells can inhibit cell division.
Several proteins function as internal regulators to ensure each cell cycle stage is completed faithfully before proceeding to the next. Regulator molecules may act directly or influence the activity or production of other...
Several proteins function as internal regulators to ensure each cell cycle stage is completed faithfully before proceeding to the next. Regulator molecules may act directly or influence the activity or production of other...