Human Interleukin 2 crystal structure
|Symbols||; IL-2; TCGF; lymphokine|
|External IDs||ChEMBL: GeneCards:|
|RNA expression pattern|
Interleukin 2 (IL-2) is an interleukin, a type of cytokine signaling molecule in the immune system. It is a protein that regulates the activities of white blood cells (leukocytes, often lymphocytes) that are responsible for immunity. IL-2 is part of the body's natural response to microbial infection, and in discriminating between foreign ("non-self") and "self". IL-2 mediates its effects by binding to IL-2 receptors, which are expressed by lymphocytes.
IL-2 is a member of a cytokine family, each member of which has a four alpha helix bundle; the family also includes IL-4, IL-7, IL-9, IL-15 and IL-21. IL-2 signals through the IL-2 receptor, a complex consisting of three chains, termed alpha, beta and gamma. The gamma chain is shared by all members of this family of cytokine receptors.
The IL-2 Receptor (IL-2R) α subunit has low affinity for its ligand but has the ability (when bound to the β and ϒ subunit) to increase the IL-2R affinity 100-fold. Heterodimerization of the β and ϒ subunits of IL-2R is essential for the signalling in T cells. 
IL-2 has key roles in key functions of the immune system, tolerance and immunity, primarily via its direct effects on T cells. In the thymus, where T cells mature, it prevents autoimmune diseases by promoting the differentiation of certain immature T cells into regulatory T cells, which suppress other T cells that are otherwise primed to attack normal healthy cells in the body. IL-2 also promotes the differentiation of T cells into effector T cells and into memory T cells when the initial T cell is also stimulated by an antigen, thus helping the body fight off infections. Its expression and secretion is tightly regulated and functions as part of both transient positive and negative feedback loops in mounting immune responses and tamping them down. Through its role in the development of T cell immunologic memory, which depends upon the expansion of the number and function of antigen-selected T cell clones, it also has a key role in enduring cell-mediated immunity.
Role in diseases
IL-2 is manufactured using recombinant DNA technology and is marketed as a protein therapeutic called aldesleukin (branded as Proleukin) by Prometheus Laboratories, Inc. It has been approved by the Food and Drug Administration (FDA) and in several European countries for the treatment of cancers (malignant melanoma, renal cell cancer) in large intermittent doses and has been extensively used in continuous doses.
The Hong Kong company, Shenzhen Neptunus Interlng-H, sells a recombinant IL-2 called Interking, with a serine at residue 125.
Eisai sells a drug called Denileukin diftitox (trade name Ontak), which is recombinant protein combining IL-2 and Diphtheria toxin. This drug binds to IL-2 receptors and introduces the diphtheria toxin into cells that express those receptors, killing the cells. In some leukemias and lymphomas, malignant cells express the IL-2 receptor, so denileukin diftitox can kill them. In 1999 Ontak was approved by the U.S. Food and Drug Administration (FDA) for treatment of Cutaneous T-cell lymphoma (CTCL).
There are different dosages of IL-2 across the United States and across the world being used to treat patients. The efficiency and side effects of different dosages is often a point of disagreement. Usually, in the U.S., the higher dosage option is used, depending on the cancer, response to treatment, and general health of the patient. Patients are typically given the high dosages for five consecutive days, three times a day, for fifteen minutes. The patient is given approximately 10 days to recover between treatment dosages. The IL-2 is delivered through an IV for this type of dosing, and hospitalization/intensive care is required throughout due to the side effects.
Another dosage option is in a lower regimen used by some doctors. It can be an injection of IL-2 under the skin at home or doctor’s office. It is also possible to get this dosage through an IV in the hospital over 1–3 days, similar to and often including the delivery of chemotherapy.
Some Common Side Effects:
- flu-like symptoms (fever, headache, muscle and joint pain, fatigue)
- dry, itchy skin or rash
- weakness or shortness of breath
- low blood pressure
- drowsiness or confusion
- loss of appetite
More serious and dangerous side effects sometimes are seen, such as capillary leak syndrome, breathing problems, serious infections, seizures, allergic reactions, heart problems or a variety of other possible complications.
IL-2 has been in clinical trials for the treatment of chronic viral infections, and as a booster (adjuvant) for vaccines. The use of large doses of IL-2 given every 6–8 weeks in HIV therapy, similar to its use in cancer therapy, was found to be ineffective in preventing progression to an AIDS diagnosis in two large clinical trials published in 2009.
Discovery and development
According to an immunology textbook: "IL-2 is particularly important historically, as it is the first type I cytokine that was cloned, the first type I cytokine for which a receptor component was cloned, and was the first short-chain type I cytokine whose receptor structure was solved. Many general principles have been derived from studies of this cytokine, including its being the first cytokine demonstrated to act in a growth factor–like fashion through specific high-affinity receptors, analogous to the growth factors being studied by endocrinologists and biochemists".:712
In the mid-1960s, studies reported "activities" in leukocyte conditioned media that promoted lymphocyte proliferation.:16 In the mid-1970s, it was discovered that T-cells could be selectively proliferated when normal human bone marrow cells were cultured in conditioned medium obtained from phytohemagglutinin-stimulated normal human lymphocytes.:712 The key factor was isolated from cultured mouse cells in 1979 and from cultured human cells in 1980. The gene for human IL-2 was cloned in 1982 after an intense competition.:76
Commercial activity to bring an IL-2 drug to market was intense in the 1980s and 90s. By 1983 Cetus Corporation had created a proprietary recombinant version of IL2 (aldesleukin, later called Proleukin), with the alanine removed from its N-terminal and residue 125 replaced with serine.:76–77:201 Amgen later entered the field with its own proprietary, mutated, recombinant protein and Cetus and Amgen were soon competing scientifically and in the courts; Cetus won the legal battles and forced Amgen out of the field.:151 By 1990 Cetus had gotten aldesleukin approved in nine European countries but in that year, the U.S. Food and Drug Administration (FDA) refused to approve Cetus' application to market IL-2. The failure led to the collapse of Cetus, and in 1991 the company was sold to Chiron Corporation. Chiron continued the development of IL-2, which was finally approved by the FDA as Proleukin for metastatic renal carcinoma in 1992. By 1993 aldesleukin was the only approved version of IL-2, but Roche was also developing a proprietary, modified, recombinant IL-2 called teceleukin, with a methionine added at is N-terminal, and Glaxo was developing a version called bioleukin, with a methionine added at is N-terminal and residue 125 replaced with alanine, and dozens of clinical trials had been conducted of recombinant or purified IL-2, alone, in combination with other drugs, or using cell therapies, in which cells were taken from patients, activated with IL-2, then infused back into the patients. Novartis acquired Chiron in 2006 and sold the aldesleukin business to Prometheus Laboratories in 2010.
- Liao W, Lin JX, Leonard WJ (2011). "IL-2 family cytokines: new insights into the complex roles of IL-2 as a broad regulator of T helper cell differentiation". Curr. Opin. Immunol. 23 (5): 598–604. doi:10.1016/j.coi.2011.08.003. PMC 3405730. PMID 21889323.
- Gaffen SL, Liu KD (2004). "Overview of interleukin-2 function, production and clinical applications". Cytokine 28 (3): 109–23. doi:10.1016/j.cyto.2004.06.010. PMID 15473953.
- Malek TR, Castro I (2010). "Interleukin-2 receptor signaling: at the interface between tolerance and immunity". Immunity 33 (2): 153–65. doi:10.1016/j.immuni.2010.08.004. PMC 2946796. PMID 20732639.
- Reich A, Szepietowski JC (2007). "Mediators of pruritus in psoriasis". Mediators Inflamm. 2007: 64727. doi:10.1155/2007/64727d. PMC 2221678. PMID 18288273.
- Noble S, Goa KL (1997). "Aldesleukin (recombinant interleukin-2)". BioDrugs 7 (5): 394–422. doi:10.2165/00063030-199707050-00007. PMID 18031103.
- Bhatia S, Tykodi SS, Thompson JA (2009). "Treatment of metastatic melanoma: an overview". Oncology (Williston Park, N.Y.) 23 (6): 488–96. PMC 2737459. PMID 19544689.
- Pollack A (July 31, 1990). "Cetus Drug Is Blocked By F.D.A.". New York Times. This source mentions approval in 9 European countries.
- Bloombert BusinessWeek. Last updated March 3, 2014 Shenzhen Neptunus Interlng-H
- FDA Page Last Updated: May 11, 2009 Changes in the Ontak (denileukin diftitiox) Package Insert to Include a Description of Ophthalmologic Adverse Events
- American Cancer Society. Interleukin-2 (Aldesleukin). Date accessed: 07 Nov 10.
- Shaker MA, Younes HM (2009). "Interleukin-2: evaluation of routes of administration and current delivery systems in cancer therapy". J Pharm Sci 98 (7): 2268–98. doi:10.1002/jps.21596. PMID 19009549.
- "IL-2 Immunotherapy Fails to Benefit HIV-Infected Individuals Already Taking Antiretrovirals". News Release. National Institutes of Health (NIH). February 10, 2009.
- Warren J. Leonard. Type I Cytokines and Interferons and Their Receptors. Chapter 23 in Fundamental Immunology, 6th ed. Editor, William E. Paul. Philadelphia : Wolters Kluwer/Lippincott Williams & Wilkins, c2008. ISBN 9780781765190
- Chavez AR, Buchser W, Basse PH, Liang X, Appleman LJ, Maranchie JK et al. (2009). "Pharmacologic administration of interleukin-2". Ann. N. Y. Acad. Sci. 1182: 14–27. doi:10.1111/j.1749-6632.2009.05160.x. PMID 20074271.
- Welte K, Wang CY, Mertelsmann R, Venuta S, Feldman SP, Moore MA (1982). "Purification of human interleukin 2 to apparent homogeneity and its molecular heterogeneity". J. Exp. Med. 156 (2): 454–64. doi:10.1084/jem.156.2.454. PMC 2186775. PMID 6980256.
- Paul Rabinow. Making PCR: A Story of Biotechnology. University of Chicago Press, 1996 ISBN 978-0226701479
- Hugo Almeida. Drugs obtained by biotechnology processing Brazilian Journal of Pharmaceutical Sciences apr/jun 2011 47(2):199-207
- Whittington R, Faulds D (September 1993). "Interleukin-2. A review of its pharmacological properties and therapeutic use in patients with cancer". Drugs 46 (3): 446–514. doi:10.2165/00003495-199346030-00009. PMID 7693434.
- "2 Biotech Pioneers To Merge". New York Times. July 23, 1991.
- Lehrman S (January 20, 1992). "Cetus: A Collision Course With Failure". The Scientist Magazine.
- Dutcher J (2002). "Current status of interleukin-2 therapy for metastatic renal cell carcinoma and metastatic melanoma". Oncology (Williston Park, N.Y.) 16 (11 Suppl 13): 4–10. PMID 12469934.
- "D02749 (Teceleukin)". KEGG drug.
- "Novartis sells rights to Proleukin in the USA to Prometheus; gets license for vaccine from IIG; and pleads guilty over Trileptal". Pharmaletter. January 27, 2010.
|Wikimedia Commons has media related to Interleukin-2.|