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Collection of Blood From Persons With Hemoglobin and Erythrocyte Polymorphisms for Laboratory Malaria Research

This study will collect blood samples for use in laboratory studies of malaria. The World Health Organization reports that 40 percent of the world's population is at risk for malaria, mostly in the poorest countries. It is a serious disease caused by parasites. Each year, 300-500 million infections lead to more than a million deaths. However, there are traits in red blood cells (erythrocyte) that protect people against malaria. In this study, polymorphism refers to the various kinds of red blood cell traits.

The sickle cell trait is an example of one that seems to offer a natural survival advantage in children where malaria is common. Researchers at the Laboratory of Malaria and Vector Research are investigating ways in which the blood cell traits can offer such protection, and new knowledge gained can bring about medical advances. Of particular importance is studying how the malaria organism, Plasmodium, survives inside different red blood cells. A steady, consistent, and reliable supply of fresh whole blood is necessary for testing.

Patients 18 to 65, weighing more than 110 lbs. and who do not have anemia or known HIV, Hepatitis C, or Hepatitis B may be eligible for this study.

Patients will undergo a medical history and general assessment including vital signs of temperature, heart rate, and blood pressure. Blood will be collected from a vein in the arm, or rarely a vein in the hand. A complete blood count, or CBC, will be done to ensure that blood levels are sufficient and that blood donation is safe for a patient to do. Patients need to have enough hemoglobin, the part of red blood cells that transports oxygen throughout the body. The blood will also be tested to confirm the type of red blood cell traits of patients. About 1 to 8 tablespoons may be collected, but most blood samples will be small, that is, 1 to 4 teaspoons. After the patients' first visit, sessions will take 5-20 minutes. Blood collection will total no more than 2 cups from a donor during any 6-week period. Although the frequency of blood donations is not known at this time, it is unlikely that a patient will be asked to donate blood more than four times a year. It may be important for patients to undergo a repeat CBC or tests for blood chemistry if results are needed for research. Risks associated with blood collection are considered minimal. They include discomfort, occasional bruising or bleeding at the puncture site, and faintness.

In this study, it is possible that a small amount of blood may be stored for future research, to help the researchers to learn more about malaria. There are no plans for the results from the various research laboratory tests to be made available to patients or to their private doctors. However, patients in this study may discuss the results of routine medical tests with the study investigators. Some of the blood collected will be tested for genetic conditions. Through genetic testing, researchers can learn more about how health or illness may be passed on to people by their parents, or from people to their children. All results of tests will remain confidential. Blood samples will be labeled by code, and reference to patients' identities will be protected.

Participants will receive $50 for each blood donation. This study will not have a direct benefit for participants. Future research that uses their blood samples will help researchers to learn about malaria as well as how to prevent or treat the disease.

Studieoversigt

Status

Afsluttet

Detaljeret beskrivelse

This protocol is designed to provide a mechanism for investigators in the Laboratory of Malaria and Vector Research (LMVR) to collect and process peripheral blood samples from volunteer donors. Donors who meet standard eligibility criteria will be recruited to donate blood via standard phlebotomy techniques at the NIH Clinical Center.

The LMVR has ongoing in vitro studies to characterize the effects of hemoglobin mutations and erythrocyte polymorphisms on the pathogenesis of Plasmodium falciparum, the agent of the most deadly malaria in humans. G6PD deficiency, hemoglobinopathies such as HbS, HbC, and HbE, and the thalassemias are thought to have evolved as protective traits against malaria in endemic areas of the world. However, the mechanisms by which these mutations exert their protective influence are largely unknown. Culturing P. falciparum in erythrocytes carrying protective traits will allow researchers in LMVR to characterize the cellular and molecular bases of protection using in vitro methods such as growth analyses and electron microscopy. To this effect, patients with known or suspected erythrocyte variants will be recruited in addition to normal controls.

Signed informed consent will be obtained by an authorized investigator. The nature of the study as well as the risks and benefits of the donation process will be explained to each participant. Donors will be compensated for each blood donation or for unsuccessful attempts at venipuncture. Samples will be used solely for in vitro research. To ensure confidentiality, blood will be assigned a unique code; investigators listed on this protocol will serve as the custodians of the codes that link the samples to the donors' identities.

Undersøgelsestype

Observationel

Tilmelding (Forventet)

130

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiesteder

    • Maryland
      • Bethesda, Maryland, Forenede Stater, 20892
        • National Institutes of Health Clinical Center, 9000 Rockville Pike

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

18 år til 65 år (Voksen, Ældre voksen)

Tager imod sunde frivillige

Ingen

Køn, der er berettiget til at studere

Alle

Beskrivelse

  • INCLUSION CRITERIA:

Normal volunteer or volunteer with a known or suspected erythrocyte mutation.

Age greater than or equal to 18 and less than or equal to 65 years old.

Weight greater than 110 pounds.

Ability to sign the consent form.

Willingness to comply with study procedures.

EXCLUSION CRITERIA:

Transfusion of any blood products within the past 90 days.

Active bleeding.

Clinically apparent and/or symptomatic anemia (pallor, orthostasis, etc).

Self-reported history of HIV, Hepatitis B virus, or Hepatitis C virus infection.

Severe chronic disease (e.g. end-stage renal failure, malignancy, etc).

Significant medical history, physical examination, or laboratory test results indicating that the subject should not participate in a clinical trial.

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart

11. januar 2006

Studieafslutning

20. juli 2010

Datoer for studieregistrering

Først indsendt

14. januar 2006

Først indsendt, der opfyldte QC-kriterier

13. januar 2006

Først opslået (Skøn)

16. januar 2006

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

2. juli 2017

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

30. juni 2017

Sidst verificeret

20. juli 2010

Mere information

Begreber relateret til denne undersøgelse

Disse oplysninger blev hentet direkte fra webstedet clinicaltrials.gov uden ændringer. Hvis du har nogen anmodninger om at ændre, fjerne eller opdatere dine undersøgelsesoplysninger, bedes du kontakte register@clinicaltrials.gov. Så snart en ændring er implementeret på clinicaltrials.gov, vil denne også blive opdateret automatisk på vores hjemmeside .

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