GMQ is an activator of acid-sensing ion channel 3 (ASIC3).{54008} It evokes rapid inward currents with little desensitization in CHO cells expressing ASIC3 (EC50 = 67 µM at neutral pH). It is also an inhibitor of the GABAA receptor (IC50 = 0.39 µM in primary rat hippocampal neurons).{54009} GMQ has stimulatory effects on large-conductance calcium-activated potassium (BKCa) channels in GH3 rat pituitary cells and on non-selective cation currents in Rolf B1.T olfactory sensory neurons.{54010} It increases paw licking time in Asic3+/+ and, to a lesser extent, Asic3-/- mice when administered at a dose of 100 µM, an effect that can be blocked by the ASIC inhibitor amiloride (Item No. 14409).{54008}
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An ASIC3 activator (EC50 = 67 µM for evoking rapid inward currents in ASIC3-expressing CHO cells at neutral pH); an inhibitor of the GABAA receptor (IC50 = 0.39 µM in primary rat hippocampal neurons); increases paw licking time in Asic3+/+ and, to a lesser extent, Asic3-/- mice at 100 µM
Formal name: N-(4-methyl-2-quinazolinyl)-guanidine, monohydrochloride
Synonyms:
Molecular weight: 237.7
CAS: 5361-15-9
Purity: ≥95%
Formulation: A crystalline solid
1,2-Dipalmitoyl-sn-glycero-3-PC (DPPC) is a zwitterionic glycerophospholipid commonly used in the formation of lipid monolayers, bilayers, and liposomes for use in a variety of applications.{14480,24261,14478,14479} It has been used in the formation of proteoliposomes for implantation of γ-glutamyl transpeptidase into human erythrocyte membranes.{14478} Incorporation of glycosphingolipid antigens into DPPC-containing liposomes increases the immunogenicity of the antigens in mice.{14479}
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The tetracycline repressor (TetR) is a transcriptional regulator which normally binds tightly to its palindromic tetO operator DNA, blocking gene expression.{17508} Tet causes the repressor to dissociate from the DNA, allowing transcription to occur. A novel reverse TetR (revTetR) requires tetracycline as a co-repressor to bind tetO and block transcription.{17509,17510} Anhydrotetracycline (hydrochloride) is a powerful effector in both the tetracycline repressor (TetR) and reverse TetR (revTetR) systems, binding the Tet repressor 35-fold more strongly than Tet.{17508,17511} Moreover, anhydrotetracycline poorly binds the 30S ribosomal subunit, compared to Tet,{17512} so it does not act as a general inhibitor of translation and is a poor antibiotic. Perhaps related to this, the concentration of anhydrotetracycline that inhibits eukaryotic cell growth is more than a 1,000-fold above the dose that alters transcription through TetR.{17508}
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The maintenance of embryonic stem cells in culture typically requires feeder cells and various exogenous factors found in serum. Murine embryonic stem (mES) cells can be maintained in the absence of feeder cells and serum but require the leukemia inhibitor factor (LIF) and bone morphogenic protein (BMP) to prevent differentiation and promote self-renewal. SC-1 is a small molecule activator of stem cell renewal that allows the propagation of OG2 mES cells for at least 10 passages in an undifferentiated state.{14533} The activity of SC-1 is mediated by the combined inhibition of RasGAP and ERK1 with Kd values of 98 and 212 nM, respectively.{14533} Inhibition of RasGAP increases Ras signaling via the PI3-kinase pathway which promotes self-renewal, whereas inhibition of ERK blocks differentiation.
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The tetracycline repressor (TetR) is a transcriptional regulator which normally binds tightly to its palindromic tetO operator DNA, blocking gene expression.{17508} Tet causes the repressor to dissociate from the DNA, allowing transcription to occur. A novel reverse TetR (revTetR) requires tetracycline as a co-repressor to bind tetO and block transcription.{17509,17510} Anhydrotetracycline (hydrochloride) is a powerful effector in both the tetracycline repressor (TetR) and reverse TetR (revTetR) systems, binding the Tet repressor 35-fold more strongly than Tet.{17508,17511} Moreover, anhydrotetracycline poorly binds the 30S ribosomal subunit, compared to Tet,{17512} so it does not act as a general inhibitor of translation and is a poor antibiotic. Perhaps related to this, the concentration of anhydrotetracycline that inhibits eukaryotic cell growth is more than a 1,000-fold above the dose that alters transcription through TetR.{17508}
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