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Jorge Galeano

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Papers by Jorge Galeano

Research paper thumbnail of Partial loss of actin nucleator Actin Related Protein 2/3 activity triggers blebbing in primary T lymphocytes

Immunology & Cell Biology

T lymphocytes utilize amoeboid migration to navigate effectively within complex microenvironments... more T lymphocytes utilize amoeboid migration to navigate effectively within complex microenvironments. The precise rearrangement of the actin cytoskeleton required for cellular forward propulsion is mediated by actin regulators, including the actin-related protein 2/3 (Arp2/3) complex, a macromolecular machine that nucleates branched actin filaments at the leading edge. The consequences of modulating Arp2/3 activity on the biophysical properties of the actomyosin cortex and downstream T cell function are incompletely understood. We report that even a moderate decrease of Arp3 levels in T cells profoundly affects actin cortex integrity. Reduction in total F-actin content leads to reduced cortical tension and disrupted lamellipodia formation. Instead, in Arp3-knockdown cells, the motility mode is dominated by blebbing migration characterized by transient, balloon-like protrusions at the leading edge. Although this migration mode seems to be compatible with interstitial migration in three-dimensional environments, diminished locomotion kinetics and impaired cytotoxicity interfere with optimal T cell function. These findings define the importance of finely tuned, Arp2/3-dependent mechanophysical membrane integrity in cytotoxic effector T lymphocyte activities.

Research paper thumbnail of Variación espacio-temporal de las cianoprocariotas del antiguo delta del río Sinú, Córdoba, Colombia

Intropica, 2014

En siete sectores del antiguo delta del río Sinú y en diferentes momentos hidrológicos se evaluar... more En siete sectores del antiguo delta del río Sinú y en diferentes momentos hidrológicos se evaluaron algunas características limnológicas y se identificaron las cianoprocariotas presentes en el sistema, atendiendo a sus caracteres morfológicos y niveles de organización. Los resultados fueron analizados considerando las diferencias ambientales. Se identificaron un total de 49 morfoespecies, distribuidas en 4 órdenes, 8 familias y 14 géneros entre los que se destacan: Microcystis, Merimopedia,

Research paper thumbnail of Partial loss of actin nucleator Actin Related Protein 2/3 activity triggers blebbing in primary T lymphocytes

Immunology & Cell Biology

T lymphocytes utilize amoeboid migration to navigate effectively within complex microenvironments... more T lymphocytes utilize amoeboid migration to navigate effectively within complex microenvironments. The precise rearrangement of the actin cytoskeleton required for cellular forward propulsion is mediated by actin regulators, including the actin-related protein 2/3 (Arp2/3) complex, a macromolecular machine that nucleates branched actin filaments at the leading edge. The consequences of modulating Arp2/3 activity on the biophysical properties of the actomyosin cortex and downstream T cell function are incompletely understood. We report that even a moderate decrease of Arp3 levels in T cells profoundly affects actin cortex integrity. Reduction in total F-actin content leads to reduced cortical tension and disrupted lamellipodia formation. Instead, in Arp3-knockdown cells, the motility mode is dominated by blebbing migration characterized by transient, balloon-like protrusions at the leading edge. Although this migration mode seems to be compatible with interstitial migration in three-dimensional environments, diminished locomotion kinetics and impaired cytotoxicity interfere with optimal T cell function. These findings define the importance of finely tuned, Arp2/3-dependent mechanophysical membrane integrity in cytotoxic effector T lymphocyte activities.

Research paper thumbnail of Variación espacio-temporal de las cianoprocariotas del antiguo delta del río Sinú, Córdoba, Colombia

Intropica, 2014

En siete sectores del antiguo delta del río Sinú y en diferentes momentos hidrológicos se evaluar... more En siete sectores del antiguo delta del río Sinú y en diferentes momentos hidrológicos se evaluaron algunas características limnológicas y se identificaron las cianoprocariotas presentes en el sistema, atendiendo a sus caracteres morfológicos y niveles de organización. Los resultados fueron analizados considerando las diferencias ambientales. Se identificaron un total de 49 morfoespecies, distribuidas en 4 órdenes, 8 familias y 14 géneros entre los que se destacan: Microcystis, Merimopedia,

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