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NF-KappaB Family Pathway NF-KappaB Family Pathway Friday, May 18, 2018
NF-KappaB (Nuclear Factor-KappaB) is a heterodimeric protein composed of different combinations of members of the Rel family of transcription factors. The Rel/ NF-KappaB family of transcription factors are involved mainly in stress-induced, immune, and inflammatory responses.
Epithelial Tight Junctions Epithelial Tight Junctions Tuesday, May 15, 2018
Epithelia in multicellular organisms constitute the frontier that separates the individual from the environment. Epithelia are sites of exchange as well as barriers, for the transit of ions and molecules from and into the organism. Epithelial cells achieve this by providing cellular borders that cover external and internal surfaces throughout the body.
PPAR Pathway PPAR Pathway Thursday, May 10, 2018
Nuclear hormone receptors are transcription factors that bind DNA and regulate transcription in a ligand-dependent manner. PPARs (Peroxisome Proliferator-Activated Receptors) are ligand-inducible transcription factors that belong to the nuclear hormone receptor superfamily, together with the receptors for thyroid hormone, retinoids, steroid hormones and vitamin D that act as ligand-activated transcription factors.
Epithelial Adherens Junctions Epithelial Adherens Junctions Wednesday, May 09, 2018
Adhesion between neighboring epithelial cells is a crucial and tightly controlled process. The integrity of cell-cell contacts is essential for the regulation of electrolyte absorption and for the prevention of tumor metastasis. In polarized epithelia, specialized structures such as Adherens Junctions (AJs) and Tight Junctions (TJs) are responsible for the establishment of [...]
Cyclins and Cell Cycle Regulation Cyclins and Cell Cycle Regulation Tuesday, May 08, 2018
Progress in the eukaryotic cell cycle is driven by oscillations in the activities of CDKs (Cyclin-Dependent Kinases). CDK activity is controlled by periodic synthesis and degradation of positive regulatory subunits, Cyclins, as well as by fluctuations in levels of negative regulators, by CKIs (CDK Inhibitors), and by reversible phosphorylation. The mammalian cell [...]
PI3K Signaling PI3K Signaling Tuesday, May 08, 2018
The (Phosphatidylinositde-3-Kinase) family of enzymes regulate diverse biological functions in every cell type by generating lipid second messengers that ultimately results in the mediation of cellular activities such as proliferation, differentiation, chemotaxis, survival, trafficking and Glucose homeostasis. On the basis of structural similarities, the members are sub-divided into three classes; Class I, [...]
Notch Signaling Notch Signaling Monday, May 07, 2018
The Notch signaling pathway is a fundamental signaling system used by neighboring cells to communicate with each other in order to assume their proper developmental role. Notch proteins are cell surface transmembrane-spanning receptors which mediate critically important cellular functions through direct cell-cell contact.
cAMP Pathway cAMP Pathway Monday, May 07, 2018
cAMP (Cyclic Adenosine 3', 5’-monophosphate) is the first identified second messenger, which has a fundamental role in the cellular response to many extracellular stimuli. The cAMP signaling pathway controls a diverse range of cellular processes. Indeed, not only did cAMP provide the paradigm for the second messenger concept, but also provided the [...]