Pi3k Activation
Pi3k Activation - Related Videos
01:22
PI3K/mTOR/AKT Signaling Pathway
0 Views •
2023
The mammalian target of rapamycin (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast, mTORC2 consists of a rapamycin-insensitive companion...
09:30
Measurement of Larval Activity in the Drosophila Activity Monitor
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Cited by 10 •
2015
This report describes a method for measuring Drosophila larval activity using the TriKinetics Drosophila Activity Monitor. The device employs infrared beams to detect movements of up to 16 individual animals. Data can be analyzed to represent motion parameters including rates and the positions of the animals within the assay chambers.
04:35
Enzyme Activity - Concepts
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2019
Biological Catalysts All living organisms continuously perform numerous biochemical reactions to sustain their presence. Most of these reactions require an input of energy to start, which is called the activation energy. Catalysts are chemicals that lower the activation energy. Even though catalysts facilitate a chemical reaction, they are not consumed by it. This means a catalyst can facilitate a specific chemical reaction over and over in succession, increasing the rate of that reaction.
02:04
Co-activators and Co-repressors
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2020
Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
02:26
tRNA Activation
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2020
Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...
FAQs
Receptor stimulation initiates a signaling sequence in which PI3K acts on phosphatidylinositol 4,5-bisphosphate, producing phosphatidylinositol 3,4,5-trisphosphate. This lipid product provides a signaling platform that recruits downstream proteins, including AKT and mTOR. Through that connection, signals originating at receptor tyrosine kinases or G protein-coupled receptors can influence several cellular activities.
Phosphatidylinositol 3,4,5-trisphosphate is important because it helps recruit downstream signaling proteins to the appropriate cellular signaling context. Its production links PI3K activity to activation of proteins such as AKT and mTOR, allowing an extracellular stimulus to produce coordinated effects on cell growth, survival, metabolism, and movement rather than remaining an isolated receptor event.
Both receptor tyrosine kinases and G protein-coupled receptors can provide upstream stimulation for PI3K signaling, although they represent distinct receptor classes. Their inclusion shows that the pathway can integrate signals from different types of extracellular sensors. Pharmacological studies can therefore examine PI3K as a shared signaling component connecting varied receptor inputs with common downstream cellular responses.
Abnormal pathway activation can sustain cellular responses that are normally regulated, creating relevance to cancer, drug resistance, and other diseases. This makes PI3K and its downstream signaling components pharmacological targets rather than merely descriptive markers. Investigators study agents that alter this pathway to clarify how dysregulated signaling contributes to disease and whether targeted treatment strategies can address it.
Pharmacological studies use PI3K inhibitors and related agents to alter pathway activity and examine the resulting cellular responses. This approach helps investigators determine how strongly PI3K signaling contributes to processes such as growth, survival, metabolism, or movement. The observed effects can also support evaluation of the pathway as a target for developing targeted treatments.
A pathway-focused investigation can begin with receptor stimulation, follow the associated PI3K signaling response and downstream activity, and then examine how inhibitors or related agents change those effects. Such studies connect an initiating extracellular signal with cellular outcomes. In pharmacology, this framework helps clarify pathway function, disease relevance, and the potential value of targeted treatment approaches.