Klarisa Rikova is a senior scientist at Cell Signaling Technology, Inc. (CST) in Danvers, Massachusetts. She has worked at CST since 2000, and worked as a scientist at CST's sister company, Bluefin Biomedicine in Beverly, Massachusetts, from 2015 to 2019.
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Rikova was raised in Tashkent, Uzbekistan. She attended the National University of Uzbekistan where she received her M.Sc. in chemistry. Rikova was hired in 2000 as a scientist at Cell Signaling Technology, Inc. From 2015 to 2019, she worked as a scientist at Bluefin Biomedicine before joining CST once again as a senior scientist.
Cell Signaling Technology, Inc. utilized a new form of probability-based mass spectroscopy to analyze post-translational modifications among peptides taken from tumor cell lines. [1] This approach to liquid chromatography-mass spectrometry (LC-MS/MS) included a probability score, or an "Ascore," which measures the probability of a correct phosphorylation site by measuring the presence of specific ions indicative of phosphorylation sites on a peptide sequence. [1] Using this method, scientists at Cell Signaling Technology were able to generate pY antibodies that function to pull down phosphorylated tyrosine residues through immunoprecipitation.
Rikova utilized this phosphoproteomic technique with tissue samples from patients with non-small cell lung cancer (NSCLC) and found excess phosphorylation in the tumor cell lines and surveyed tyrosine kinase signaling in these cancer lines. [2] Tyrosine kinase receptors present putative diagnostic targets as they are themselves phosphorylated at tyrosine residues upon activation, thereby indicating the receptor is active. [3] Analyzing NSCLC tissue samples identified oncogenic tyrosine kinases based on their phosphorylation profile and identified the novel ALK and ROS fusion proteins in NSCLC. [2] To determine the genetic profile of these proteins, Rikova performed RT-PCR and discovered ALK to be fused to EML4, a microtubule protein, triggering perpetual activation of the ALK tyrosine kinase. [2] She proposed that a coiled-coil domain fused to the kinase domain of ALK is likely to permit oligomerization and consequently, constitutive activation of ALK kinase in these cancer types. [2] Similarly, the ROS tyrosine kinase was determined to be fused to SLC34A2, a transmembrane carrier protein, such that the N-terminal domain of SLC34A2 is fused to the transmembrane domain in ROS, also found to have constitutive activation. [2]
Focusing on cell signaling and post-transcriptional modifications (PTMs) enabled this novel screening technique that identifies specific oncogenic mutations in patients.
A tyrosine kinase is an enzyme that can transfer a phosphate group from ATP to the tyrosine residues of specific proteins inside a cell. It functions as an "on" or "off" switch in many cellular functions.
Autocrine signaling is a form of cell signaling in which a cell secretes a hormone or chemical messenger that binds to autocrine receptors on that same cell, leading to changes in the cell. This can be contrasted with paracrine signaling, intracrine signaling, or classical endocrine signaling.
Gefitinib, sold under the brand name Iressa, is a medication used for certain breast, lung and other cancers. Gefitinib is an EGFR inhibitor, like erlotinib, which interrupts signaling through the epidermal growth factor receptor (EGFR) in target cells. Therefore, it is only effective in cancers with mutated and overactive EGFR, but resistances to gefitinib can arise through other mutations. It is marketed by AstraZeneca and Teva.
Erlotinib, sold under the brand name Tarceva among others, is a medication used to treat non-small cell lung cancer (NSCLC) and pancreatic cancer. Specifically it is used for NSCLC with mutations in the epidermal growth factor receptor (EGFR) — either an exon 19 deletion (del19) or exon 21 (L858R) substitution mutation — which has spread to other parts of the body. It is taken by mouth.
The MAPK/ERK pathway is a chain of proteins in the cell that communicates a signal from a receptor on the surface of the cell to the DNA in the nucleus of the cell.
Receptor tyrosine kinases (RTKs) are the high-affinity cell surface receptors for many polypeptide growth factors, cytokines, and hormones. Of the 90 unique tyrosine kinase genes identified in the human genome, 58 encode receptor tyrosine kinase proteins. Receptor tyrosine kinases have been shown not only to be key regulators of normal cellular processes but also to have a critical role in the development and progression of many types of cancer. Mutations in receptor tyrosine kinases lead to activation of a series of signalling cascades which have numerous effects on protein expression. Receptor tyrosine kinases are part of the larger family of protein tyrosine kinases, encompassing the receptor tyrosine kinase proteins which contain a transmembrane domain, as well as the non-receptor tyrosine kinases which do not possess transmembrane domains.
The RETproto-oncogene encodes a receptor tyrosine kinase for members of the glial cell line-derived neurotrophic factor (GDNF) family of extracellular signalling molecules. RET loss of function mutations are associated with the development of Hirschsprung's disease, while gain of function mutations are associated with the development of various types of human cancer, including medullary thyroid carcinoma, multiple endocrine neoplasias type 2A and 2B, pheochromocytoma and parathyroid hyperplasia.
Insulin receptor substrate 1(IRS-1) is a signaling adapter protein that in humans is encoded by the IRS1 gene. It is a 131 kDa protein with amino acid sequence of 1242 residues. It contains a single pleckstrin homology (PH) domain at the N-terminus and a PTB domain ca. 40 residues downstream of this, followed by a poorly conserved C-terminus tail. Together with IRS2, IRS3 (pseudogene) and IRS4, it is homologous to the Drosophila protein chico, whose disruption extends the median lifespan of flies up to 48%. Similarly, Irs1 mutant mice experience moderate life extension and delayed age-related pathologies.
SHC-transforming protein 1 is a protein that in humans is encoded by the SHC1 gene. SHC has been found to be important in the regulation of apoptosis and drug resistance in mammalian cells.
Tyrosine-protein phosphatase non-receptor type 1 also known as protein-tyrosine phosphatase 1B (PTP1B) is an enzyme that is the founding member of the protein tyrosine phosphatase (PTP) family. In humans it is encoded by the PTPN1 gene. PTP1B is a negative regulator of the insulin signaling pathway and is considered a promising potential therapeutic target, in particular for treatment of type 2 diabetes. It has also been implicated in the development of breast cancer and has been explored as a potential therapeutic target in that avenue as well.
Anaplastic lymphoma kinase (ALK) also known as ALK tyrosine kinase receptor or CD246 is an enzyme that in humans is encoded by the ALK gene.
Tyrosine-protein kinase receptor UFO is an enzyme that in humans is encoded by the AXL gene. The gene was initially designated as UFO, in allusion to the unidentified function of this protein. However, in the years since its discovery, research into AXL's expression profile and mechanism has made it an increasingly attractive target, especially for cancer therapeutics. In recent years, AXL has emerged as a key facilitator of immune escape and drug-resistance by cancer cells, leading to aggressive and metastatic cancers.
Protein TFG is a protein that in humans is encoded by the TFG gene.
Proto-oncogene tyrosine-protein kinase ROS is an enzyme that in humans is encoded by the ROS1 gene.
Crizotinib, sold under the brand name Xalkori among others, is an anti-cancer medication used for the treatment of non-small cell lung carcinoma (NSCLC). It acts as an ALK and ROS1 inhibitor.
Src kinase family is a family of non-receptor tyrosine kinases that includes nine members: Src, Yes, Fyn, and Fgr, forming the SrcA subfamily, Lck, Hck, Blk, and Lyn in the SrcB subfamily, and Frk in its own subfamily. Frk has homologs in invertebrates such as flies and worms, and Src homologs exist in organisms as diverse as unicellular choanoflagellates, but the SrcA and SrcB subfamilies are specific to vertebrates. Src family kinases contain six conserved domains: a N-terminal myristoylated segment, a SH2 domain, a SH3 domain, a linker region, a tyrosine kinase domain, and C-terminal tail.
ALK inhibitors are anti-cancer drugs that act on tumours with variations of anaplastic lymphoma kinase (ALK) such as an EML4-ALK translocation. They fall under the category of tyrosine kinase inhibitors, which work by inhibiting proteins involved in the abnormal growth of tumour cells. All the current approved ALK inhibitors function by binding to the ATP pocket of the abnormal ALK protein, blocking its access to energy and deactivating it. A majority of ALK-rearranged NSCLC harbour the EML4-ALK fusion, although as of 2020, over 92 fusion partners have been discovered in ALK+ NSCLC. For each fusion partner, there can be several fusion variants depending on the position the two genes were fused at, and this may have implications on the response of the tumour and prognosis of the patient.
Ceritinib is a prescription-only drug used for the treatment of non-small cell lung cancer (NSCLC). It was developed by Novartis and received FDA approval for use in April 2014..Ceritinib is also sold under the brand name Spexib in few countries by Novartis.
Alectinib (INN,), sold under the brand name Alecensa, is an anticancer medication that is used to treat non-small-cell lung cancer (NSCLC). It blocks the activity of anaplastic lymphoma kinase (ALK). It is taken by mouth. It was developed by Chugai Pharmaceutical Co. Japan, which is part of the Hoffmann-La Roche group.
Entrectinib, sold under the brand name Rozlytrek, is an anti-cancer medication used to treat ROS1-positive non-small cell lung cancer and NTRK fusion-positive solid tumors. It is a selective tyrosine kinase inhibitor (TKI), of the tropomyosin receptor kinases (TRK) A, B and C, C-ros oncogene 1 (ROS1) and anaplastic lymphoma kinase (ALK).
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