Lamivudine  

CAS號：134678-17-4

英文名：Lamivudine  

中文名：拉米夫定

Synonyms: 拉米夫定; BCH-189

純度：99+%

Formula  C₈H₁₁N₃O₃S          分子量  229.26

Appearance   White to off-white solid

生物活性：Lamivudine (BCH-189) is an orally active nucleoside reverse transcriptase inhibitor (NRTI). Lamivudine can inhibit HIV reverse transcriptase 1/2 and also the reverse transcriptase of hepatitis B virus. Lamivudine salicylate can penetrate the CNS.

Lamivudine (BCH-189) 是一種具有口服活性的核苷逆轉(zhuǎn)錄酶 (nucleoside reverse transcriptase) 抑制劑 (NRTI)。Lamivudine 可以抑制 HIV 逆轉(zhuǎn)錄酶 1 和 2 以及乙型肝炎病毒 (hepatitis B virus) 的逆轉(zhuǎn)錄酶。Lamivudine 可以透過血腦屏障。

研究領域：

Reverse Transcriptase (逆轉(zhuǎn)錄酶)

Reverse transcriptases (RTs) are enzyme used to generate complementary DNA (cDNA) from an RNA template, a process termed reverse transcription. Reverse transcriptases (RTs) use an RNA template and a short primer complementary to the 3' end of the RNA to direct the synthesis of the first strand cDNA.

Nucleoside reverse transcriptase inhibitors (NRTIs) block reverse transcriptase (an HIV enzyme). Non-nucleoside reverse transcriptase inhibitors (NNRTIs) bind to and block HIV reverse transcriptase. HIV uses reverse transcriptase to convert its RNA into DNA (reverse transcription). Blocking reverse transcriptase and reverse transcription prevents HIV from replicating.

HIV (人類免疫缺陷病毒)

Human immunodeficiency virus

HIV (Human immunodeficiency virus) is a lentivirus (a subgroup of retrovirus) that causes the acquired immunodeficiency syndrome (AIDS), a condition in humans in which progressive failure of the immune system allows life-threatening opportunistic infections and cancers to thrive. Infection with HIV occurs by the transfer of blood, semen, vaginal fluid, pre-ejaculate, or breast milk. Within these bodily fluids, HIV is present as both free virus particles and virus within infected immune cells. HIV infects vital cells in the human immune system such as helper T cells (specifically CD4⁺ T cells), macrophages, and dendritic cells. HIV infection leads to low levels of CD4⁺ T cells through a number of mechanisms, including apoptosis of uninfected bystander cells, direct viral killing of infected cells, and killing of infected CD4⁺ T cells by CD8 cytotoxic lymphocytes that recognize infected cells. When CD4⁺ T cell numbers decline below a critical level, cell-mediated immunity is lost, and the body becomes progressively more susceptible to opportunistic infections.

Anti-infection (抗感染)

Anti-infectives are drugs that can either kill an infectious agent or inhibit it from spreading. Anti-infectives include antibiotics and antibacterials, antifungals, antivirals and antiprotozoals.

Antibiotics specifically treat infections caused by bacteria, most commonly used types of antibiotics are: Aminoglycosides, Penicillins, Fluoroquinolones, Cephalosporins, Macrolides, and Tetracyclines. New other approaches such as photodynamic therapy (PDT) and antibacterial peptides have been considered as alternatives to kill bacteria.

The high rates of morbidity and mortality caused by fungal infections are associated with the current limited antifungal arsenal and the high toxicity of the compounds. The most common antifungal targets include fungal RNA synthesis and cell wall and membrane components, though new antifungal targets are being investigated.

Viral infections occur when viruses enter cells in the body and begin reproducing, often causing illness. Viruses are classified as DNA viruses or RNA viruses, RNA viruses include retroviruses, such as HIV, are prone to mutate. The currently available antiviral drugs target 4 main groups of viruses: herpes, hepatitis, HIV and influenza viruses. Drug resistance in the clinical utility of antiviral drugs has raised an urgent need for developing new antiviral drugs.

Antiprotozoal drugs are medicines that treat infections caused by protozoa. Of which, malaria remains a major world health problem following the emergence and spread of Plasmodium falciparum that is resistant to the majority of antimalarial drugs. At present, antimalarial discovery approaches have been studied, such as the discovery of antimalarials from natural sources, chemical modifications of existing antimalarials, the development of hybrid compounds, testing of commercially available drugs that have been approved for human use for other diseases and molecular modelling using virtual screening technology and docking.

HBV (乙型肝炎病毒)

Hepatitis B virus

HBV (Hepatitis B virus), abbreviated HBV, is a species of the genus Orthohepadnavirus, which is likewise a part of the Hepadnaviridae family of viruses. HBV causes the disease hepatitis B. The hepatitis B virus is classified as the type species of the Orthohepadnavirus, which contains three other species: the Ground squirrel hepatitis virus, Woodchuck hepatitis virus, and theWoolly monkey hepatitis B virus. The genus is classified as part of the Hepadnaviridae family. HBV is divided into four major serotypes (adr, adw, ayr, ayw) based on antigenic epitopes present on its envelope proteins, and into eight genotypes (A–H) according to overall nucleotide sequence variation of the genome. The genotypes have a distinct geographical distribution and are used in tracing the evolution and transmission of the virus. Differences between genotypes affect the disease severity, course and likelihood of complications, and response to treatment and possibly vaccination.

參考文獻

[1]. Colledge D, et al. Synergistic inhibition of hepadnaviral replication by lamivudine in combination with penciclovir in vitro. Hepatology. 1997 Jul;26(1):216-25.

[2]. Olaniyan LW, et al. Lamivudine-Induced Liver Injury. Open Access Maced J Med Sci. 2015 Dec 15;3(4):545-50.  

[3]. Mdanda S, et al. Zidovudine and Lamivudine as Potential Agents to Combat HIV-Associated Neurocognitive Disorder. Assay Drug Dev Technol. 2019 Oct;17(7):322-329.