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Thiazolyl blue, better known as MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide), harbors a fascinating duality-it is both a vital tool in cell biology and a chameleonic chemical oddity. This yellow crystalline powder undergoes a startling metamorphosis in living cells: mitochondrial reductases cleave its tetrazolium ring, transforming it into an insoluble purple formazan precipitate-a reaction so visually striking that it has become the gold standard for measuring cell viability. Yet beyond the lab bench, MTT reveals more esoteric behaviors; its crystalline structure forms peculiar "herringbone" patterns under microscopy, while its redox properties allow it to participate in exotic photochemical reactions when exposed to specific wavelengths of light.
Curiously, the compound exhibits a rare phenomenon called "metachromasia"-appearing different colors depending on concentration and molecular environment-a property once exploited by textile chemists to create "smart" dyes. Recent studies have uncovered its unexpected role as a weak inhibitor of certain respiratory chain enzymes, hinting that this ubiquitous assay reagent may have been subtly influencing the very metabolic processes scientists use it to study. When dissolved in organic solvents, MTT solutions display an unusual fluorescence quenching effect that has puzzled physical chemists, suggesting complex intermolecular interactions still awaiting full explanation.
|
Chemical Formula |
C18H16BrN5S |
|
Exact Mass |
414 |
|
Molecular Weight |
413 |
|
m/z |
413 (100.0%), 415 (97.3%), 416 (18.9%), 414 (16.2%), 415 (4.5%), 417 (4.4%), 414 (3.2%), 414 (1.8%), 416 (1.8%), 417 (1.2%), 415 (1.1%) |
|
Elemental Analysis |
C, 52.18; H, 3.89; Br, 19.29; N, 16.90; S, 7.74 |
Thiazolyl blue,The chemical name is 3- (4,5-dimethyl-2-thiazole) -2,5-diphenyltetrazolium bromide, abbreviated as MTT, which is an important organic compound. Since Mosman first reported the use of MTT staining to determine cell growth and survival in 1983, MTT has been widely applied in fields such as life sciences, medical research, and drug development. The following is a detailed explanation of its purpose:
Application in Cell Biology Research
MTT is one of the classic methods for determining cell proliferation. During cell culture, dehydrogenases such as succinate dehydrogenase in live cell mitochondria can reduce exogenous MTT to insoluble blue purple crystalline formazan, which deposits in the cell. Dead cells lack this reducing ability and therefore do not produce formazan. By dissolving formazan in cells and measuring its light absorption value at specific wavelengths (such as 490nm or 562nm) using an enzyme-linked immunosorbent assay (ELISA) reader, the number of live cells can be indirectly reflected. Within a certain range of cell numbers, the amount of MTT crystals formed is proportional to the number of cells, so cell proliferation can be determined based on the measured absorbance value (OD value).
Application in Cell Biology Research
MTT can also be used to determine the toxicity of drugs or other treatment methods (such as radiation irradiation) on cultured cells in vitro. By comparing the OD values of the treatment group and the control group, the effect of drugs or treatment methods on cell activity can be evaluated. The larger the OD value, the stronger the cell activity; On the contrary, it indicates that the weaker the cell activity or the greater the cell toxicity. This method has wide applications in drug screening, toxicology research, and other fields. Although MTT is mainly used to measure cell proliferation and cytotoxicity, in some cases, it can also be used to assist in the study of cell apoptosis.
During the process of cell apoptosis, the enzyme activity inside the cell changes, which may affect the reducing ability of MTT. By comparing the difference in OD values between apoptotic cells and normal cells, the occurrence of cell apoptosis can be preliminarily determined. However, it should be noted that MTT is not a specialized method for detecting cell apoptosis, and its results need to be comprehensively analyzed in conjunction with other apoptosis detection methods.
Application in drug development
In the process of drug development, MTT assay is a commonly used high-throughput drug screening method. By co incubating the test drug with cells and using MTT assay to measure changes in cell activity, potential active drug molecules can be quickly screened. This method has the advantages of easy operation, reliable results, and high throughput, and has important application value in the early stage of drug development. The MTT assay can also be used to study the mechanism of action of drugs. By comparing the changes in cell activity under different drug treatment conditions, the impact of drugs on processes such as cell proliferation and apoptosis can be preliminarily determined
By combining other molecular biology techniques such as Western blot and flow cytometry, the targets and signaling pathways of drugs can be further revealed. In drug safety evaluation, MTT assay can be used to assess the toxic effects of drugs on cells. By measuring the OD value changes of cells after drug treatment, it is possible to determine whether the drug has cytotoxicity and the strength of toxicity. This is of great significance for guiding preclinical research and clinical application of drugs.
The application of MTT in other fields
In immunological research, MTT assay can be used to determine the proliferation ability of lymphocytes. By co incubating lymphocytes with antigens or immunostimulants and measuring changes in cell activity using MTT assay, the immune response ability of lymphocytes can be evaluated. This method has wide applications in vaccine development, immunotherapy, and other fields. In oncology research, MTT assay can be used to determine the proliferation activity and drug sensitivity of tumor cells. By comparing the changes in OD values of tumor cells under different drug treatment conditions, drug molecules with inhibitory effects on tumor cells can be screened and their anti-tumor effects can be evaluated.
This is of great significance for guiding the clinical treatment of tumors. In environmental toxicology research, MTT assay can be used to evaluate the toxic effects of environmental pollutants on cells. By co incubating cells with different concentrations of pollutants and measuring changes in cell activity using MTT assay, the toxicity and mechanism of action of pollutants can be determined. This is of great significance for assessing the ecological risks of environmental pollutants and formulating environmental protection policies.
Experimental steps of thiazolylblue method
Trypsin digests logarithmic phase cells, centrifuges and collects them after termination to make cell suspension, and adjusts its concentration to 5-10 by cell count × 104/ml. For beginners, it is necessary to make cells reach 5-10 × 104/ml often doesn't know where to start. I'm here to provide you with a simple method to initially determine the number of cells.
Take 25cm2 commonly used for cell culture as an example:
1) The cell density is about 80%~90% (the figure below shows the approximate state of cells at 80%~90% density). After digestion and centrifugation, remove the supernatant, and add 3ml medium to mix it.
2) Take a new 15ml sterile centrifuge tube (for the next step of inoculation of 96-well plate) and fill it with about 9ml medium
3) Take 1ml from the 3ml cell suspension prepared in the first step, add it into the upper tube, and count the cells after mixing. At this time, it is generally 5-10 or less × 104/ml, which is equivalent to 5-10 cells per cell in 4 cells of the cell counting board (see the figure below); If the concentration is not enough, the cell suspension shall be added according to the counting result, and each drop shall be calculated as 50ul.
4) The number of cells should be adjusted according to the different purposes of the experiment. For example, in general cell proliferation experiment, 2000 cells per well can be used (equivalent to cell suspension density of 2 × 104/ml), 5000 to 10000 cells per well (equivalent to cell suspension density of 5 × 104/ml). In addition, the number of cells should also be determined according to their own characteristics, such as growth speed. For example, the density of cells growing faster may be slightly smaller.
After preparing the cell suspension, mix it gently and add 100ul into each hole, so that the density of the cells to be tested is 5000-10000/hole (the edge hole is filled with sterile PBS).L Note: Because the cells will continue to settle after mixing, it is necessary to mix repeatedly during the process of inoculation, such as mixing once every six holes, to ensure that the cell density of the inoculation is exactly the same between the holes, which is crucial to the results of MTT.Put the inoculated cell culture plate into the incubator for cultivation until the cell monolayer is covered with the bottom of the hole (96-hole flat plate), and add the drug with concentration gradient.
In principle, the drug can be added after the cell is attached to the wall, or two hours, or half a day, but we often add the drug in the afternoon of the previous day, and the next morning. Generally, 5-7 gradients, 100ul per hole, and 3-5 multiple holes are set. It is recommended to set 6, otherwise it is difficult to reflect the real situation. The following figure can be used as a reference step for 96-hole plate.L For dosing, some people directly add drugs into 96-well plates by different volumes to form a concentration gradient. But I think we should try to mix different concentrations of drugs in the EP tube.
Then remove the culture supernatant from the 96-well plate (which can be sucked away with a discharge gun) and add 100ul of culture medium containing different concentrations of drugs.Which can ensure the accuracy of drug concentration.In addition, it should be noted that if this method is used, do not suck all the 96-well plate culture solution before adding medicine. You should add samples immediately after sucking a part of it to avoid cell death due to the drying of the 96-well plate.Incubate with 4.5% CO2 at 37 ℃ for 16-48 hours, and observe the effect of the drug under the inverted microscope. The following figure shows a typical drug gradient of cytotoxicity.
clinical application
Thiazolyl blue, whose Chinese name is Methyl Blue, is an important organic compound that is widely used in medicine, biology and chemistry. in medicine, it is often used to treat nitrite poisoning, cyanide poisoning, etc., and is also used in the diagnosis andadjuvant treatment of some diseases;In biological research, it can be used as a staining agent for labeling cells or tissues. However, like many drugs, methylene blue may also have a series of side effects during use.
Digestive system side effects
Nausea and vomiting are one of the common digestive system side effects of methylene blue.
When methylene blue enters the body, it may stimulate the gastrointestinal mucosa, causing nausea and even vomiting in severe cases.This symptom is more pronounced when the intravenous injection speed is too fast or the dosage is too large.For example, in some clinical cases, patients may experience significant nausea and vomiting shortly after rapid intravenous injection of methylene blue, which affects their comfort and treatment experience. Some patients may experience abdominal pain after using methylene blue, and the degree of pain may vary depending on individual differences, ranging from mild discomfort to more severe pain.
At the same time, it may also be accompanied by diarrhea, which may be due to the interference of methylene blue on intestinal peristalsis and digestive function, leading to abnormal intestinal movement and changes in digestive fluid secretion.Long term or frequent occurrence of abdominal pain and diarrhea not only affects the patient's nutrient absorption and physical health, but may also lead to other complications.
After using methylene blue, the urine color will turn blue, which is caused by the excretion of methylene blue and its metabolites into the urine through the kidneys. In general, this change in urine color is temporary and will not have a serious impact on physical health.
But in some special cases, such as patients with urinary system diseases, changes in urine color may interfere with the diagnosis of the disease, and doctors need to conduct a comprehensive analysis based on other examination indicators. During urination, some patients may feel a stinging sensation at the urethral opening.This may be due to the stimulating effect of methylene blue on the urethral mucosa, especially when the urine concentration is high or the urethral mucosa is rubbed during urination, the stinging sensation will be more pronounced. This symptom can cause certain discomfort to patients and affect their daily life.
Cardiovascular system side effects
Thiazolyl blue may affect the normal function of the cardiovascular system, leading to an increase or decrease in blood pressure. When the dosage of intravenous injection is too high, patients may experience a decrease in blood pressure, accompanied by symptoms such as increased heart rate and arrhythmia. Abnormal changes in blood pressure can affect the blood perfusion of important organs such as the heart and brain, increasing the risk of cardiovascular disease. For example, some elderly patients or patients with cardiovascular disease may experience more significant blood pressure fluctuations after using methylene blue, and it is necessary to closely monitor blood pressure changes and adjust treatment plans in a timely manner.
Palpitations and chest tightness are also possible cardiovascular side effects that methylene blue may cause. The patient may feel a rapid and irregular heartbeat, or a sense of compression or tightness in the chest. These symptoms may cause anxiety in patients, further increasing the burden on the cardiovascular system. If the symptoms of palpitations and chest tightness persist or worsen, timely medical attention should be sought for relevant examinations and treatment.
Neurological side effects
Dizziness and headache are common neurological side effects of methylene blue. After using methylene blue, patients may feel dizzy and disoriented in the head, or experience discomfort such as swelling and pain in the head. This symptom may affect the patient's attention and thinking ability, and reduce work and life efficiency. The occurrence of dizziness and headache may be related to the effects of methylene blue on brain blood vessels and nerves, and the specific mechanism still needs further research. In rare cases, methylene blue may cause consciousness disorders such as drowsiness, coma, etc.
references
Mosmann T. Rapid colorimetric assay for cellular growth and survival: Application to proliferation and cytotoxicity assays[J]. Journal of Immunological Methods, 1983, 65(1-2): 55-63. DOI:10.1016/0022-1759(83)90303-4
Berridge M V, Tan A S. Characterization of the cellular reduction of 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT): subcellular localization, substrate dependence, and involvement of mitochondrial electron transport in MTT reduction[J]. Archives of Biochemistry and Biophysics, 1993, 303(2): 474-482. DOI:10.1006/abbi.1993.1294
Kang S, Oh Y J, Kim M R, et al. Development of a Convenient and Quantitative Method for Evaluating Photosensitizing Activity Using Thiazolyl Blue Formazan Dye[J]. Molecules, 2024, 29(11): 2471. DOI:10.3390/molecules29112471
frequently asked questions
1.What is the use of thiazolyl blue tetrazolium bromide?
Thiazolyl Blue Tetrazolium Blue (MTT) may be used in measurement of cell proliferation. MTT produces a yellowish solution that is converted to dark blue, water-insoluble MTT formazan by mitochondrial dehydrogenases of living cells.
2.Is Thiazolyl Blue safe to store?
Temperature Conditions: Seal the powder and store it in a refrigerator at -20℃ for freezing preservation, which can effectively extend the shelf life (usually 1–2 years); for short-term storage (within 1 month), it can be temporarily kept under 4℃ refrigeration conditions.Light-proof and Moisture-proof Requirements: MTT powder is light-sensitive and shall be stored in brown reagent bottles or transparent bottles wrapped with tin foil. Meanwhile, drying agents (e.g., silica gel) should be added to prevent the powder from absorbing moisture and caking.
3.Will Thiazolyl Blue color change?
When the solution shows a blue purple precipitate or darkens in color, it indicates that it has been oxidized and cannot be continued to be used.
Avoid placing the solution at room temperature or in a light environment, as it may quickly fail.
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