이 페이지는 자동 번역되었으며 번역의 정확성을 보장하지 않습니다. 참조하십시오 영문판 원본 텍스트의 경우.

Characterization of Skin Immunity to Aedes Aegypti Saliva in Dengue-endemic Participants in Cambodia

2022년 3월 21일 업데이트: National Institute of Allergy and Infectious Diseases (NIAID)

Characterization of Skin Immunity to Aedes Aegypti Saliva in Dengue-Endemic Participants in Cambodia

Background:

Mosquito-borne viruses like dengue cause major illness and death worldwide, particularly in Southeast Asia. When mosquitoes deliver a virus into the skin of humans, they also leave saliva. Researchers want to learn more about skin immunity to mosquito saliva. They hope this will help with future vaccines and treatments for these diseases.

Objective:

To compare the early and late innate immune response in the skin of Aedes aegypti bitten versus unbitten skin.

Eligibility:

Healthy people ages 18-45 who live within about 15 km of the study site in Chbar Mon

Design:

Participants will have 3 visits.

The baseline/screening visit will include:

Medical and medication history

Questions about participants demographic information, mosquito biting risk factors, and responses to mosquito or other insect bites

Physical exam

Urine sample for some participants

Mosquito feeding. A feeding device will be placed on the participant s arm for up to 20 minutes. The insects will feed through a mesh on the bottom of the feeding device. Participants may be given standard treatments for any skin reactions.

Blood tests

Four skin biopsies taken from bitten and unbitten skin. Local anesthetic will be administered, and a small tool will be used to remove the participant s skin.

Participants will have a second visit the next day. They will have a physical exam and blood tests. They will have 1 skin biopsy.

Participants will have a final visit about 2 weeks later. They will have a physical exam and blood tests.

During the study, participants will be asked to take measures to prevent more mosquito bites.

연구 개요

상태

완전한

정황

개입 / 치료

상세 설명

Mosquito-borne viruses continue to cause significant global morbidity and mortality, particularly in Southeast Asia. When mosquitoes deliver the virus into the skin of humans while probing for a blood meal, they deposit also saliva, which contains a myriad of pharmacologically active compounds that modulate the host immune system. Little is known about skin immunity to mosquito saliva, particularly in endemic volunteers as most clinical studies are performed in na(SqrRoot) ve individuals who have never or rarely been exposed to a particular mosquito vector. People living in endemic areas have had long-term repeated exposure to these vectors and therefore have different immune response to mosquito saliva, which could interfere with mosquito-borne disease vaccine effectiveness. Characterization of skin immunity via various technical modalities will be important in order to identify critical aspects of the innate and adaptive immune responses after a vector bite.

Here, we will execute a paired study of exposed-unexposed skin to carefully examine the innate and adaptive immune responses in the skin and blood to exposure of the saliva of Aedes aegypti, the mosquito vector of dengue, Zika, and chikungunya viruses. We will enroll 42 participants to undergo vector feeding and give blood samples at baseline and 2 and 14 days later. Additionally, participants will give skin punch biopsy samples of bitten (exposed) and unbitten (unexposed) skin. For analysis, we will group 10-12 participants in each of 4 technical modality cohorts or groups : 1) immunohistochemistry, 2) RNA sequencing, 3) flow cytometry, and 4) T-cell receptor sequencing. With the current rise of vector-borne diseases in the United States and around the world, we hope the results of this study contribute to future vaccine design and clinical development strategies for vector#borne diseases.

연구 유형

중재적

등록 (실제)

42

단계

  • 1단계

연락처 및 위치

이 섹션에서는 연구를 수행하는 사람들의 연락처 정보와 이 연구가 수행되는 장소에 대한 정보를 제공합니다.

연구 장소

  • 캄보디아
      • Chbar Mon, 캄보디아, 05251
        • Kampong Speu Referral Hoispital

참여기준

연구원은 적격성 기준이라는 특정 설명에 맞는 사람을 찾습니다. 이러한 기준의 몇 가지 예는 개인의 일반적인 건강 상태 또는 이전 치료입니다.

자격 기준

공부할 수 있는 나이

18년 (성인)

건강한 자원 봉사자를 받아들입니다

아니

연구 대상 성별

모두

설명

  • INCLUSION CRITERIA:

In order to be eligible to participate in this study, an individual must meet all of the following criteria:

-Provision of signed and dated informed consent form

  • Stated willingness to comply with all study procedures and availability for the duration of the study
  • Male or female, aged 18 - 45 years
  • Live within approximately 15 km of study site
  • In good general health as evidenced by medical history
  • Willing to allow biological samples to be stored for future research.

  • A female is eligible for this study if she meets 1 of the following:

    • Of non-childbearing potential (i.e., women who have had a hysterectomy or tubal

ligation or are postmenopausal, as defined by no menses in >=1 year).

--Of childbearing potential but has negative urine pregnancy test on Day 0

  • Agrees to not use scented lotions, deodorants, or topical creams on each feeding day.
  • Agrees to not take aspirin or any other NSAID (ex. ibuprofen) within 7 days of a biopsy.
  • Agrees to not use oral or topical antihistamines or steroid creams or ointments throughout the

study without prior permission of Principal Investigator (PI).

EXCLUSION CRITERIA:

-Any underlying or current medical condition that, in the opinion of the investigator, would

interfere with participation in the study.

-History of severe allergic reaction (including to mosquito or other insect bites) with generalized

urticaria, angioedema, anaphylaxis, anaphylactoid reaction or any other reaction described by

the participant and deemed severe by the PI.

  • Self-reported or known history of alcoholism or drug abuse within 6 months prior to enrollment
  • Self-reported or known history of psychiatric or psychological issues that require treatment and

are deemed by the PI to be a contraindication to protocol participation.

-Any use of medications that affect blood clotting within 3 months or history of abnormal blood

clotting

-History of significant scarring such as keloids after previous biopsies, lacerations, abrasions,

surgeries, or other skin procedures (e.g., cosmetic piercings) that are deemed by the PI to be a

contraindication to protocol participation.

-Pregnant or breastfeeding.

공부 계획

이 섹션에서는 연구 설계 방법과 연구가 측정하는 내용을 포함하여 연구 계획에 대한 세부 정보를 제공합니다.

연구는 어떻게 설계됩니까?

디자인 세부사항

  • 주 목적: 기초 과학
  • 할당: 해당 없음
  • 중재 모델: 단일 그룹 할당
  • 마스킹: 없음(오픈 라벨)

무기와 개입

참가자 그룹 / 팔
개입 / 치료
실험적: Mosquito Feeding
Each participant will receive one mosquito feeding with 5 starved female Aedes aegypti mosquitoes.
다른: Mosquito Feeding
Mosquito feedings will be conducted with Aedes aegypti colonies raised at the CNM (National Malaria Center) Malaria and Vector Research Laboratory (MVRL), an established state of the art insectaries for mosquitoes was built in 2014 to ACL2 (arthropodcontainment level 2)-level specifications.

연구는 무엇을 측정합니까?

주요 결과 측정

결과 측정
측정값 설명
기간
Measurement of Change in Early and Late Innate Immune Responses Using Gene Expression and Flow Cytometry in Participants' Skin
기간: Day 0 timepoints
Measurement of changes in the early and late innate immune response and cellular recruitment in bitten skin versus unbitten skin by: a) immunohistochemistry of target proteins at Day 0 timepoints b) immunophenotyping of innate immune cell subsets in dissociated skin sample at Day 0 timepoints c) determination of cytokine profile in dissociated skin sample supernatant at Day 0 timepoints d) differential cDNA expression prepared from skin RNA and analyzed via RNASeq at Day 0 timepoints
Day 0 timepoints
Measurement of Changes in the Adaptive Immune Response and Cellular Recruitment in the Skin of Bitten Versus Unbitten Skin After Sixth and Final Feeding in Each Vector Group.
기간: Day 2 (48 hr post feeding)
Measurement of changes in the adaptive immune response and cellular recruitment in bitten skin versus unbitten skin by: a) immunohistochemistry of target proteins at Day 2 timepoints b) phenotyping of adaptive immune cell subsets in dissociated skin sample at Day 2 timepoints c) determination of cytokine profile in dissociated skin sample supernatant at Day 2 timepoints d) differential cDNA expression prepared from skin RNA and analyzed via RNASeq at Day 2 timepoints
Day 2 (48 hr post feeding)

2차 결과 측정

결과 측정
측정값 설명
기간
Flow Cytometry Analysis of PBMCs Collected Day 0 (Baseline) and Days 2 and 14 After Feeding for Saliva-specific T-cells
기간: Day 14
Describing and understanding cellular immunity to Aedes saliva in heavily exposed individuals will simulate endemic conditions and will inform vaccine design in these target populations.
Day 14

공동 작업자 및 조사자

여기에서 이 연구와 관련된 사람과 조직을 찾을 수 있습니다.

스폰서

National Institute of Allergy and Infectious Diseases (NIAID)

간행물 및 유용한 링크

연구에 대한 정보 입력을 담당하는 사람이 자발적으로 이러한 간행물을 제공합니다. 이것은 연구와 관련된 모든 것에 관한 것일 수 있습니다.

일반 간행물

연구 기록 날짜

이 날짜는 ClinicalTrials.gov에 대한 연구 기록 및 요약 결과 제출의 진행 상황을 추적합니다. 연구 기록 및 보고된 결과는 공개 웹사이트에 게시되기 전에 특정 품질 관리 기준을 충족하는지 확인하기 위해 국립 의학 도서관(NLM)에서 검토합니다.

연구 주요 날짜

연구 시작 (실제)

2020년 10월 27일

기본 완료 (실제)

2021년 4월 9일

연구 완료 (실제)

2021년 4월 9일

연구 등록 날짜

최초 제출

2020년 4월 16일

QC 기준을 충족하는 최초 제출

2020년 4월 16일

처음 게시됨 (실제)

2020년 4월 17일

연구 기록 업데이트

마지막 업데이트 게시됨 (실제)

2022년 4월 12일

QC 기준을 충족하는 마지막 업데이트 제출

2022년 3월 21일

마지막으로 확인됨

2021년 4월 9일

추가 정보

이 연구와 관련된 용어

키워드

추가 관련 MeSH 약관

기타 연구 ID 번호

  • 999920053
  • 20-I-N053

약물 및 장치 정보, 연구 문서

미국 FDA 규제 의약품 연구

아니

미국 FDA 규제 기기 제품 연구

아니

이 정보는 변경 없이 clinicaltrials.gov 웹사이트에서 직접 가져온 것입니다. 귀하의 연구 세부 정보를 변경, 제거 또는 업데이트하도록 요청하는 경우 register@clinicaltrials.gov. 문의하십시오. 변경 사항이 clinicaltrials.gov에 구현되는 즉시 저희 웹사이트에도 자동으로 업데이트됩니다. .

구독하다