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Sephadex G75 is a kind of gel filter filler with good performance. It is prepared by crosslinking dextran and epichlorohydrin. It is a bead shaped gel with a large amount of hydroxyl groups, which is easy to swell in water and electrolyte solutions. The maximum exclusion limit of this compound is 80000, and the specific swelling degree depends on the amount of dry resin and operating conditions. For example, under certain conditions, the swelling degree of dry resin may be 519mL/g. When the operating pH range is 6.210 (5.210 for some products), the compound can remain stable. It is recommended to store it at room temperature, cool, and away from light in the temperature range of 430 ℃ (or 425 ℃) to maintain its performance and stability. This substance is particularly suitable for large biomolecules with a molecular weight greater than 80000. Mainly used for desalination and buffer replacement of such large biomolecules. Through a one-step operation, it is possible to quickly desalinate, remove pollutants, and transfer molecules to a new buffer solution. In addition to desalination and buffer replacement, Sephadex G-75 is also suitable for the purification process of large biomolecules.
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Sephadex G75 is a dextran gel, which is mainly used for the separation and purification technology in biochemistry and molecular biology. The main uses of this substance are as follows:
In the desalination process, it can effectively remove salts (usually small molecule inorganic salts) from biological molecular solutions. The advantage of this substance is that it is easy to operate, fast, and can achieve effective desalination without altering the activity of biomolecules. In addition, due to its excellent chemical stability and biocompatibility, it is suitable for desalination treatment of various biomolecules, including proteins, peptides, nucleic acids, etc. In practical applications, gel desalting is usually combined with other purification technologies such as ion exchange, affinity chromatography, etc., to achieve comprehensive purification and separation of biomolecules.
This substance has a wide range of applications in buffer replacement, especially in the fields of biochemistry and molecular biology. For example, in the process of protein purification, it is sometimes necessary to transfer proteins from one buffer system to another buffer system that is more suitable for their stability and activity. And this substance can effectively achieve this goal; In the process of nucleic acid extraction, it is also necessary to separate the nucleic acid from the solution containing impurities and salts, and transfer it to a new buffer for subsequent operations. It is also applicable to this scenario; During cell culture, it is sometimes necessary to replace the culture medium or buffer to maintain cell growth and activity. It can be used to remove harmful substances from old culture media or buffers and introduce new culture media or buffers.
Molecular sieving
In protein research and preparation processes, it is usually necessary to separate target proteins from complex mixtures. It can separate proteins based on their size, thereby achieving protein purification. By adjusting the elution conditions, such as the ion strength and pH value of the eluent, the separation efficiency of proteins can be further optimized. In addition to proteins and nucleic acids, it can also be used for the separation and purification of other biomolecules, such as polysaccharides, enzymes, antibodies, etc. The movement speed of these biomacromolecules in gel depends on their size and shape, so as to achieve effective separation. Although this substance is not directly used as a tool for molecular weight determination, it can serve as an auxiliary tool in molecular weight determination.
In the process of protein purification, it is usually necessary to remove small molecule impurities such as salts, small molecule metabolites, unbound ligands, etc. from the protein solution. This substance can effectively remove these small molecule impurities from protein solutions, thereby improving the purity of proteins. Its molecular sieve effect enables these small molecule impurities to be effectively removed, resulting in purer nucleic acids. Enzyme preparations typically contain small molecule impurities such as unreacted substrates, inhibitors, metabolites, etc. These impurities may affect the activity and stability of enzymes. Through the gel filtration of the material, these small molecular impurities can be effectively removed and the purity of the enzyme preparation can be improved. In addition to proteins and nucleic acids,
Simulate intercellular signal transduction
Inter cellular signal transduction is the core regulatory mechanism of life activities, involving complex processes such as cell recognition, signal conversion, and physiological response. Traditional research often relies on live cell models, but there are limitations such as complex signal networks and multiple interfering factors. Sephadex G75 is a classic dextran gel filtration medium. Its porous structure and molecular sieve effect provide a unique physical model for simulating intercellular signal transduction.
A physical model for simulating intercellular signal transduction using Sephadex G-75
Simulation of intercellular gap junctions
Gap junction is a hydrophilic channel formed between adjacent cells through a linker, allowing for free exchange of small molecules with a molecular weight<1500 Da. The pore size range of Sephadex G-75 (40-300 μ m) is much larger than that of intercellular junctions (about 1.5 nm), but its porous structure can simulate molecular diffusion processes in local microenvironments. For example:
Gradient formation of signal molecules: different concentrations of signal molecules (such as cAMP, Ca ²+) are loaded into the gel column. The difference of diffusion rate of small molecules in the gel pore can be observed through the molecular sieve effect, and the gradient transmission of chemical signals between cells can be simulated.
Synergistic response simulation: two interacting molecules (such as ligand and receptor) are loaded on both ends of the gel column respectively, and their binding kinetics is analyzed through the elution time difference to simulate the molecular recognition process in the direct contact communication between cells.
Simulation of Molecular Contact on Membrane Surface
The communication between membrane surface molecules relies on the specific interactions of cell membrane surface proteins. Sephadex G-75 can simulate this process through functional modification:
Receptor ligand binding experiment: biotinylated receptor proteins (such as EGFR) are fixed on the surface of gel particles, fluorescent labeled ligands (such as EGF) are captured through the streptavidin biotin system, and the binding signal intensity is monitored with a fluorescence detector to quantify the receptor ligand affinity.
Competitive binding analysis: Preload the receptor ligand complex in the gel column, add competitive inhibitors of different concentrations (such as anti EGFR antibodies), calculate the inhibition constant (Ki) through the elution peak shift, and simulate the intervention effect of drugs on cell signal pathways.
Simulation of Chemical Signal Transmission
Chemical signal transduction relies on the diffusion of chemical signaling molecules (such as hormones and cytokines) secreted by cells through body fluids or extracellular matrix to target cells. Sephadex G-75 can construct a three-dimensional diffusion model:
Paracrine system simulation: Secretory cells (such as macrophages) and target cells (such as T cells) are respectively encapsulated in gel microspheres, and the activation status of target cells (such as CD69 expression) is observed through co culture to simulate the local effect of paracrine signals.
Endocrine signal transmission: fluorescent labeled hormones (such as insulin) are loaded into the gel column, and their interaction with gel pores is analyzed through the elution time, and the half-life of hormones in blood circulation and target organ distribution are predicted by combining mathematical models.
Application case of Sephadex G-75 in cell signaling research
Research on Red Blood Cell Signal Transduction and Integrin Function
The platelet adhesion receptor integrin α IIb β 3 is the most abundant glycoprotein on the surface of the platelet membrane and is crucial for hemostasis and thrombus formation. Study the use of Sephadex G-75 to simulate the interaction between platelets and subendothelial collagen:
Integrin activation model: the purified integrin α IIb β 3 was fixed on the surface of gel particles, and soluble fibrinogen (Fg) was added as ligand. The binding kinetics was detected by surface plasmon resonance (SPR). It was found that the affinity of integrin to Fg after activation was significantly improved (Kd was reduced from μ M to nM).
Antiplatelet drug screening: preload integrin Fg complex in gel column, add antiplatelet drugs of different concentrations (such as tirofiban), calculate the inhibition rate of drugs on integrin activity by elution peak displacement, and provide a high-throughput screening platform for the development of new antithrombotic drugs.
Regulation of tumor related signaling pathways
Tumor cells promote proliferation and metastasis through abnormal activation of signaling pathways such as MAPK and PI3K/Akt. Sephadex G-75 can be used to isolate and purify key proteins in signaling pathways:
EGFR signal pathway research: EGFR protein was purified by Sephadex G-75 gel filtration, and its phosphorylation status was analyzed by mass spectrometry. It was found that the phosphorylation level of Y1068 and Y1086 sites of EGFR was significantly increased after EGF stimulation, which activated downstream ERK1/2 and Akt signals.
Drug resistance mechanism analysis: In drug-resistant gastric cancer cells (SGC7901/VCR), UHRF1 protein was isolated and purified by Sephadex G-75, and it was found that its overexpression can inhibit the activation of apoptosis related proteins (such as Caspase-3), reduce chemotherapy drug sensitivity (IC ₅ increased by 3-5 times).
Immune cell signaling and polysaccharide regulation
Red algae polysaccharides (BFP) enhance immune response by activating the NF - κ B and MAPK signaling pathways in macrophages. Research on the separation and purification of BFP and its components (F1, F2, F3) using Sephadex G-75:
Polysaccharide component analysis: BFP, F1, F2 and F3 with purity>95% were obtained by Sephadex G-75 gel filtration combined with DEAE Cellulose 52 ion exchange chromatography, and their molecular weights were 120 kDa, 85 kDa, 60 kDa and 45 kDa, respectively.
Signal pathway activation: In the RAW264.7 macrophage model, BFP and its components can significantly induce the secretion of NO and TNF - α, and its mechanism involves NF - κ B nuclear translocation and phosphorylation of JNK, ERK, and p38 MAPK. The purified components separated by Sephadex G-75 showed that F1 had the strongest activation effect on NF - κ B and MAPK pathways (increasing NO production by 2.5 times and TNF - α secretion by 3 times).
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