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Line Loss01:10

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The different configurations of source-load connections include wye (star) and delta connections. The relationship between line and phase voltages and currents varies depending on the configuration. When the source is supplying power, it is transmitted through the wires to the load, and during this transmission, some power is absorbed by the wires, leading to line loss.
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Loss of Gadd45b accelerates BCR-ABL-driven CML.

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Growth arrest and DNA-damage-inducible 45b (Gadd45b) protein suppresses chronic myeloid leukemia (CML) development. Loss of Gadd45b accelerates leukemia by increasing proliferation and decreasing apoptosis in BCR-ABL driven CML.

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Area of Science:

  • Molecular Biology
  • Oncology
  • Cellular Stress Response

Background:

  • Gadd45b is a stress-sensor protein belonging to the Gadd45 family.
  • The role of Gadd45b in BCR-ABL oncogene-driven leukemia, such as chronic myeloid leukemia (CML), remains unclear.

Purpose of the Study:

  • To investigate the functional role of Gadd45b in the development of BCR-ABL driven CML.
  • To elucidate the molecular mechanisms by which Gadd45b influences CML progression.

Main Methods:

  • Utilized a mouse model of CML involving syngeneic wild-type mice reconstituted with Gadd45b-null or wild-type myeloid progenitors transduced with BCR-ABL.
  • Analyzed CML progression, mouse survival, progenitor proliferation, apoptosis, and signaling pathways including c-Jun NH2-terminal kinase (JNK) and Stat5.

Main Results:

  • Loss of Gadd45b significantly accelerated BCR-ABL driven CML development, leading to a shortened median survival time in mice.
  • BCR-ABL-expressing CML progenitors lacking Gadd45b demonstrated increased proliferation and reduced apoptosis.
  • This phenotype was associated with the hyper-activation of JNK and Stat5 signaling pathways.

Conclusions:

  • Gadd45b acts as a suppressor in BCR-ABL driven leukemia, similar to Gadd45a, but through distinct mechanisms.
  • Gadd45b plays a critical role in regulating CML cell proliferation and survival, making it a potential therapeutic target.