Assays & Kits

TSLP (thymic stromal lymphopoietin) is a protein that functions as a type I cytokine, as an alarmin and growth factor in the immune system. It is involved in type 2 immune responses, T_H2 (T helper 2 cells) responses, and the maturation and recruitment of dendritic cells (DCs), T cells, B cells, neutrophils, mast cells, and other lymphoid cells.  It can be produced by epithelial and stromal cells in lung, skin, and gastric system, but also by DCs, basophils and mast cells. Its expression can be induced by infections, pro-inflammatory cytokines, proteases, and even mechanical injury. For instance, it can be produced in the lungs in response to infection with influenza or rhinovirus. Its role as alarmin can result in increasing inflammation. TSLP is linked to allergic reactions such as asthma, atopic dermatitis, and food allergies, by inducing the expression of OX40L, CD80 and CD86 and stimulating CD4⁺T cells. In 2021, the TLSP-neutralizing antibody tezepelumab was

The BLM helicase, also known as Bloom syndrome protein, is a key enzyme involved in DNA replication and repair (DDR). The BLM helicase is a member of the RecQ family of helicases, which are evolutionarily conserved and found in many organisms, including bacteria, yeast, and humans. It catalyzes the unwinding of duplex DNA with 3' to 5' directionality, driven by the energy generated from ATP hydrolysis. BLM plays a crucial role in maintaining genomic stability by unwinding DNA structures during processes such as DNA replication, recombination, and repair. Mutations in the BLM gene can lead to Bloom syndrome, a rare genetic disorder characterized by growth deficiency, sun-sensitive skin lesions, and an increased risk of cancer. High expression of BLM is found in glioblastoma, and it was found that inhibition of its activity leads to increased susceptibility to treatment with drugs targeting other proteins involved in DDR, such as PARP1 (poly-ADP ribosylation protein 1). The use of BLM in

"The CUTANA™ Quick Cleanup DNA Purification Kit can be used to purify CUT&RUN or CUT&Tag DNA and remove unwanted adapter-/primer-dimers from these reactions. Unlike many kits that purify DNA using spin columns, this kit uses SPRI paramagnetic beads for streamlined, higher throughput workflows easily integrated into CUTANA™ genomic mapping assays. Depending on the application, various SPRI bead:DNA ratios are added to capture target DNA. In CUT&RUN, pAG-MNase cleaves DNA proximal to antibody-labeled chromatin, releasing it into the supernatant. It is imperative to recover the highest DNA yield possible from the supernatant; therefore, a higher bead:DNA ratio is added to span a wide range of DNA fragment lengths. This kit includes sufficient volume to perform 48 total CUT&RUN reactions at an empirically optimized higher bead ratio. In CUT&Tag, pAG-Tn5 cleaves antibody-bound chromatin and simultaneously ligates adapter DNA, resulting in longer DNA fragments. Further, in the EpiCypher C

Cytoplasmic isocitrate dehydrogenase (ICDHc, EC 1.1.1.42) is widely distributed in animals, plants, microorganisms, and cultured cells. It catalyzes the decarboxylation and dehydrogenation of isocitrate to produce α-ketoglutarate, while simultaneously reducing NADP+ to NADPH. ICDHc serves as another significant source of NADPH in the cytoplasm, apart from the pentose phosphate pathway, and its activity often undergoes notable changes under stress conditions. CheKine™ Micro Isocitrate Dehydrogenase Cytoplasmic (ICDHc) Activity Assay Kit is capable of detecting cytosolic isocitrate dehydrogenase (ICDHc) activity in animal and plant tissues, cells, or bacteria, as well as in serum (plasma). The principle behind this involves utilizing ICDHc's catalytic action in reducing NADP+ to NADPH, with the subsequent increase in NADPH concentration being measured at a wavelength of 340 nm.

β-glucuronidase (β-GD), a matrix degradation enzyme involved in tumor invasion and metastasis, is widely found in animal tissues. It has physiological functions such as hydrolyzing sterol glucuronic acid and acidic mucopolysaccharide. The content of this enzyme is high in hepatocytes. In addition, it is rich in gastric cancer, so the determination of β-GD activity in gastric juice is of great significance for the study of gastric cancer. CheKine™ Micro β-glucuronidase (β-GD) Activity Assay Kit can detect animal tissues. In this kit, β-GD catalyzed phenol β-D-glucuronic acid to produce free phenolphthalein, and the enzyme activity was determined by determining the content of phenol.

The activity of plant dehydrogenase (PDHA) is largely reflects the active state of the organism, which can directly indicate the ability of biological cells to degrade its matrix. CheKine™ Micro Plant Dehydrogenase (PDHA) Activity Assay Kit can be used to detect biological samples such as plant tissues. In this kit, The hydrogen acceptor 2,3,5-triphenyl tetrazolium chloride (TTC) generates red triphenyl formazone (TFF) after receiving hydrogen during cell respiration. TFF has a characteristic absorptionpeak at 485 nm, the PDHA activity can quantified by measuring the absorbance at 485 nm.

Asparagine synthetase (AS) is a widely distributed enzyme in living organisms belonging to the class of amino transferases. It catalyzes the transfer of an amine group from glutamine to aspartic acid. When a plant is subjected to ammonia toxicity, the formation of asparagine serves as a detoxification mechanism. CheKine™ Micro Asparagine Synthetase (AS) Activity Assay Kit is designed to quantify asparagine synthetase activity in animal and plant tissues, bacterial and cellular samples, as well as in serum (plasma). The assay principle relies on the AS enzyme's ability to catalyze the hydrolysis of L-asparagine into L-aspartic acid and ammonia. By employing Nessler's reagent to detect the rate of ammonia accumulation, the enzymatic activity of AS can be determined.