Vitamin C shield protecting DNA from Leishmania

Can Vitamin C Protect Against a Leishmaniasis Drug's Side Effects?

"New research explores how ascorbic acid could reduce the genetic damage caused by miltefosine, a key drug in treating Leishmaniasis."


Leishmaniasis is a parasitic disease found worldwide, caused by various species of Leishmania protozoa. Visceral leishmaniasis, the most severe form, can be fatal if left untreated, with a significant number of new cases and deaths occurring each year.

Miltefosine is a crucial oral medication used to combat leishmaniasis, particularly in cases resistant to traditional treatments. However, recent studies indicate that miltefosine can cause genomic lesions by DNA oxidation, raising concerns about its safety.

The use of antioxidants like Vitamin C (ascorbic acid) is being explored to mitigate the damaging effects of miltefosine. Researchers are investigating whether Vitamin C can reduce the genotoxic and mutagenic effects of miltefosine, and if it interferes with the drug's ability to fight the Leishmania parasite.

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What Is Leishmaniasis?

Leishmaniasis is a parasitic disease caused by infection with Leishmania parasites, which are spread by the bite of infected sand flies. The CDC classifies it as a neglected tropical disease. It is a vector-borne disease caused by obligate intracellular protozoa of the genus Leishmania. Human infection is caused by about 21 of the 30 Leishmania species that infect mammals.

Clinical Burden

Leishmaniasis is a parasitic infection caused by Leishmania protozoa and spread through sandfly bites. According to Cleveland Clinic, the disease can cause disfiguring ulcers or life-threatening illness. These outcomes illustrate why clinical management may involve substantial medical challenges. The source does not specify a single standard treatment method or detail its limitations.

A Disease With a Long Scientific History

Leishmaniasis has been studied as an infection caused by Leishmania parasites and transmitted by sand flies. Its foundational understanding depends on recognizing both the parasite and its insect vector. The historical development of treatments and scientific milestones is not detailed in the supplied material, so specific dates and discoveries cannot be established here.

How Can Vitamin C Help?

Vitamin C shield protecting DNA from Leishmania

A new study has explored the potential of Vitamin C to reduce the harmful side effects of miltefosine, a drug used to treat Leishmaniasis. The research focused on whether Vitamin C could protect against DNA damage caused by miltefosine without reducing the drug's effectiveness.

The study involved experiments with mice, both uninfected and infected with Leishmania infantum. The mice were treated with miltefosine alone, Vitamin C alone, or a combination of both. Researchers then conducted several tests, including:

  • Comet Assays: to assess DNA damage in cells.
  • Micronucleus Tests: to evaluate genetic mutations.
  • Superoxide Dismutase (SOD) Enzyme Dosages: to measure antioxidant enzyme activity.
  • Parasitic Burden Assessments: to determine the effectiveness of the treatment in reducing the number of parasites.
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Current Research Landscape

Research on leishmaniasis continues to examine the disease, its parasite, and the ways infection is transmitted. However, no specific recent study, review, intervention, or finding was provided for this subsection. Any conclusions about vitamin C or protection from drug side effects would require evidence not included in the supplied material.

Evidence Gaps

The supplied material does not describe failed treatments, contradictory findings, or arguments against using vitamin C alongside a leishmaniasis drug. It therefore cannot establish whether vitamin C protects against side effects or fails to do so. Claims about risks, limitations, or negative results would require additional sources.

No Direct Comparison Available

No source material was supplied comparing vitamin C with another protective strategy, treatment approach, or control condition. The available evidence does not support ranking therapies or determining relative effectiveness. A meaningful comparison would require studies reporting comparable outcomes.

The results showed that Vitamin C, when administered intraperitoneally (through injection), offered a protective effect against DNA damage caused by miltefosine. However, this protective effect was not observed when Vitamin C was given orally, possibly due to lower absorption levels in the body.

The Future of Leishmaniasis Treatment

This study suggests that Vitamin C can help protect against the genotoxic effects of miltefosine, a key drug in treating Leishmaniasis, without reducing the drug's effectiveness. Further research is needed to optimize the method of Vitamin C delivery and fully understand its potential benefits for patients undergoing Leishmaniasis treatment. It also highlights the effectiveness of miltefosine in reducing parasitic burden, even at lower doses.

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What Can Be Concluded

The supplied sources establish that leishmaniasis is a sandfly-transmitted infection caused by Leishmania parasites. They do not provide expert commentary on vitamin C, drug-related side effects, or supportive treatment. A firm synthesis about vitamin C therefore cannot be made from the available material.

Questions for Future Study

Future research could clarify whether vitamin C has any role in reducing side effects associated with leishmaniasis treatment. The supplied material does not identify ongoing trials, research priorities, or emerging therapies. Specific predictions about the field would therefore be premature.

A Neglected Tropical Disease

The CDC identifies leishmaniasis as a neglected tropical disease. It is transmitted by infected sand flies and involves Leishmania parasites, with about 21 of 30 mammal-infecting species known to cause human infection. The supplied sources do not provide further information about health-system barriers, access to care, or broader systemic challenges.

Potentially Serious Consequences

Leishmaniasis can have serious effects on people affected by the infection. Cleveland Clinic reports that it can cause disfiguring ulcers or life-threatening illness. The supplied material does not describe patients' experiences, treatment access, or whether vitamin C changes these real-world outcomes.

What keeps the mouse findings from settling the question

  • With oral dosing, micronucleated-cell frequency did not fall; the authors suggested the route may have produced too little ascorbic acid in the blood.[1]
  • Repeated-dose miltefosine caused genotoxic damage in the tested regimens, but the study did not find a mutagenic effect at those doses.[1]
  • The authors reported no rise in SOD enzyme activity; that measure alone does not establish whether other antioxidant responses changed.[1]

Ascorbic acid and miltefosine: mouse genotoxicity experiments

Study designAnimal study[2]
DurationSingle-dose treatment and repeated-dose treatment; infected animals received miltefosine at 2.5 mg/kg for 28 days or 5.0 mg/kg for 14 days[2]
p-valuep < 0.0001 for lymph-node parasite burden reduction with miltefosine[2]
FundingCAPES (Finance Code 001) and FAPEMA[2]
Times cited8[2]

What remains unresolved about the protection

  • Would the route- and timing-dependent DNA protection seen in mice also occur in people receiving miltefosine?[1] [2]
  • Does the reduced damage observed in mouse assays translate into fewer clinically meaningful harms, or persist with treatment schedules beyond those tested?[1] [2]

About this Article -

Written with AI assistance from published research, and reviewed by the Mystum team. See our About page for more information.

This article is based on research published under:

DOI-LINK: 10.1016/j.ijpddr.2018.12.002, Alternate LINK

Title: Ascorbic Acid Reduces The Genetic Damage Caused By Miltefosine (Hexadecylphosphocholine) In Animals Infected By Leishmania (Leishamnia) Infantum Without Decreasing Its Antileishmanial Activity

Subject: Pharmacology (medical)

Journal: International Journal for Parasitology: Drugs and Drug Resistance

Publisher: Elsevier BV

Authors: Patrícia Valéria Castelo-Branco, Hugo José Alves, Raissa Lacerda Pontes, Vera Lucia Maciel-Silva, Silma Regina Ferreira Pereira

Published: 2019-04-01

Everything You Need To Know

1

What is the role of miltefosine in treating Leishmaniasis?

Miltefosine is a crucial oral medication used to combat Leishmaniasis, particularly in cases that are resistant to traditional treatments. It is a key drug in the fight against the Leishmania parasite. The article highlights miltefosine's effectiveness in reducing the parasitic burden, even at lower doses. However, the article also notes that miltefosine can cause genomic lesions by DNA oxidation, raising concerns about its safety.

2

Why is Vitamin C being explored as a potential treatment alongside miltefosine?

Scientists are exploring Vitamin C (ascorbic acid) to mitigate the damaging effects of miltefosine. Studies indicate that miltefosine can cause DNA damage (genomic lesions), raising safety concerns. Vitamin C, as an antioxidant, is investigated for its potential to reduce these genotoxic and mutagenic effects caused by miltefosine, while ensuring it does not interfere with the drug's effectiveness in fighting the Leishmania parasite.

3

What specific tests were conducted in the study involving Vitamin C and miltefosine?

The study used several tests to evaluate the effects of Vitamin C and miltefosine. These included Comet Assays to assess DNA damage in cells, Micronucleus Tests to evaluate genetic mutations, Superoxide Dismutase (SOD) Enzyme Dosages to measure antioxidant enzyme activity, and Parasitic Burden Assessments to determine the treatment's effectiveness in reducing the number of parasites. These tests were conducted on mice, both infected and uninfected with Leishmania infantum, treated with miltefosine, Vitamin C, or a combination of both.

4

How did the method of administering Vitamin C impact the study's findings?

The method of administering Vitamin C significantly impacted the study's findings. The results showed that when Vitamin C was administered intraperitoneally (through injection), it offered a protective effect against DNA damage caused by miltefosine. However, this protective effect was not observed when Vitamin C was given orally, possibly due to lower absorption levels in the body. This highlights the importance of the delivery method when using Vitamin C to mitigate the side effects of miltefosine.

5

What are the implications of this research for future Leishmaniasis treatments?

The study suggests that Vitamin C can help protect against the genotoxic effects of miltefosine, a key drug in treating Leishmaniasis, without reducing its effectiveness. The findings highlight a potential strategy to reduce the side effects of miltefosine. Further research is needed to optimize the method of Vitamin C delivery. The goal is to fully understand its potential benefits for patients undergoing Leishmaniasis treatment. This could lead to improved treatment outcomes, balancing the efficacy of miltefosine with reduced risk of side effects, improving the lives of those affected by the parasitic disease.

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