Related Experiment Video
Updated: Dec 17, 2025
07:14
Ookluc: A Plasmodium berghei Line for Identifying Transmission-blocking Compounds
Published on: July 11, 2025
451
Chloroquine in controlling biological infections.
Tadeusz Płusa1, Monika Lengier-Krajewska2, Alicja Baranowska2
1Medical Faculty of Lazarski University, Warsaw, Poland; Mazovian Center of Rehabilitation STOCER, Konstancin-Jeziorna, Poland.
Summary
Chloroquine, an antimalarial drug, effectively inhibits SARS-CoV-2 by increasing endosomal pH and blocking viral entry. Clinical observations confirm its efficacy in early-stage COVID-19 treatment.
Area of Science:
- Pharmacology
- Virology
- Immunology
Background:
- Quinine from Cinchona bark was an early antimalarial.
- Chloroquine synthesized mid-20th century, targets Plasmodium and Entamoeba histolytica.
- Chloroquine possesses immunomodulatory properties, used in autoimmune and rheumatic diseases.
Purpose of the Study:
- To investigate the efficacy of chloroquine against SARS-CoV-2.
- To elucidate the mechanisms by which chloroquine inhibits viral infectivity.
Main Methods:
- In vitro studies on protozoan polymerase inhibition.
- Analysis of chloroquine's effect on endosomal pH and viral-cell interactions.
- Assessment of chloroquine's binding to sialic acid and gangliosides.
Main Results:
- Chloroquine increases toxic heme levels in Plasmodium.
- Drug accumulation in protozoan vacuoles is key to sensitivity.
- Chloroquine inhibits SARS-CoV-2 by increasing endosomal pH and blocking S protein binding to gangliosides.
- Clinical observations support chloroquine's effectiveness in early SARS-CoV-2 infection.
Conclusions:
- Chloroquine demonstrates dual efficacy against protozoan infections and SARS-CoV-2.
- The drug's antiviral mechanism involves disrupting viral entry into host cells.
- Chloroquine is a potential therapeutic agent for COVID-19, particularly in early stages.
Related Concept Videos
01:28Biological Methods for Microbial Control
693
Biological agents offer an effective means of controlling microbial growth by leveraging natural processes like predation, competition, and the secretion of antimicrobial substances.Predatory bacteria such as Bdellovibrio species target and kill pathogens like Salmonella and E. coli. They are widely used in poultry farms to control infections. Myxococcus species help combat plant-pathogenic fungi. These naturally occurring predators serve as eco-friendly alternatives to chemical pesticides and...
693
01:29Bacterial Phylum Chlamydiae
334
The phylum Chlamydiae or Chlamydiota is composed of a single order, Chlamydiales. This phylum consists entirely of obligate intracellular parasites that infect eukaryotic hosts. While human pathogens within this group have been studied extensively, the phylum encompasses many species capable of interacting with various eukaryotic organisms. Members of Chlamydiae are typically small cocci, approximately 0.5 μm in diameter, and exhibit a distinctive developmental cycle. As is characteristic...
334
01:27Diversity of Protists II
683
Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...
683
01:27Chemical Agents for Microbial Control
646
Chemicals play important roles in controlling microbial growth by targeting microbial structures and functions as sanitizers, antiseptics, disinfectants, and sterilants.Alcohols are commonly used sanitizers, effectively disrupting lipid membranes, which compromises cell integrity. They are also used as antiseptics and disinfectants due to their rapid action and versatility.Phenols and their derivatives phenolics , known for denaturing proteins and disrupting cell membranes, are particularly...
646
01:10Retrovirus Life Cycles
48.9K
Retroviruses have a single-stranded RNA genome that undergoes a special form of replication. Once the retrovirus has entered the host cell, an enzyme called reverse transcriptase synthesizes double-stranded DNA from the retroviral RNA genome. This DNA copy of the genome is then integrated into the host’s genome inside the nucleus via an enzyme called integrase. Consequently, the retroviral genome is transcribed into RNA whenever the host’s genome is transcribed, allowing the...
48.9K
01:20Infection
11.4K
When a pathogen enters the body and reproduces, it can cause an infection, damage body cells, and cause illness symptoms that eventually lead to disease. Therefore, its prevention requires breaking the chain of infection.
The chain begins with pathogens: bacteria, viruses, fungi, prions, or parasites such as protozoa helminths. These can be present on the skin as transient or resident flora, or they can be acquired from the environment. Identifying and treating the type of infection and...
The chain begins with pathogens: bacteria, viruses, fungi, prions, or parasites such as protozoa helminths. These can be present on the skin as transient or resident flora, or they can be acquired from the environment. Identifying and treating the type of infection and...
11.4K