Korean journal of applied entomology (한국응용곤충학회지)

Korean Society of Applied Entomology (한국응용곤충학회)
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Osmoregulatory Physiology in Ixodidae Ticks: An Alternative Target for Management of Tick

진드기의 수분조절 생리와 진드기 방제전략

  • Received : 2022.01.10
  • Accepted : 2022.02.08
  • Published : 2022.03.01
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Abstract

Ticks are the arthropod vector capable of transmitting diverse pathogens, which include bacteria, viruses, protozoan and fungi. Ticks are able to survive under stressful environmental conditions. One of evolutionary outcomes of these obligatory hematophagous arthropods is the survival for extended periods of time without a blood meal during off-host periods. Water conservation biology and heat tolerance have allowed ticks to thrive even under high temperatures and low relative humidity, thus they have become highly successful arthropods as they are distributed globally. Tick osmoregulatory physiology is a complex mechanism, which involves multiple osmoregulatory organs (salivary glands, Malpighian tubules, hindgut and synganglion) for the acquisition and excretion of water and ions. Blood feeding and water vapor uptake have been early reported as the primary passages for ixodid tick to acquire water. Recently, we have learned that ticks can actively drink environmental water allowing hydration. The acquired water can be traced to the salivary glands (type I acini) and the midgut diverticula. This opens new avenues for tick management through the delivery of toxic agents into their drinking water, in addition to an alternative strategy for the study of tick physiology. Here we address the osmoregulatory physiology in the ixodid ticks as a potential target physiological mechanism for tick control. We discuss the implications of water drinking behavior for tick control through the delivery of toxic agents and discuss the dermal excretion physiology as an additional pathway to induce tick dehydration and tick death.

진드기는 박테리아, 바이러스, 원생동물 및 균류를 포함한 다양한 병원체를 전달할 수 있는 감염병매개체이다. 진드기는 불리한 환경조건에서도 생존할 수 있는 능력이 있으며, 흡혈이 필수적인 절지동물의 진화적 산물로써 비흡혈 기간이 장기간 지속되는 경우에도 생존이 가능하다. 특히, 높은 온도와 낮은 습도 환경에서도 견딜 수 있는 수분 조절 메커니즘과 내열성의 생리적 특징은 진드기가 전 세계적으로 분포하도록 한 중요한 요인이다. 진드기의 침샘, 말피기관, 후장 그리고 뇌를 포함하는 여러 기관이 관여하는 물과 이온의 획득 및 배출은 복합적인 메커니즘에 의해 조절된다. 진드기가 수분을 확보하는 주요 경로는 흡혈과정 또는 공기 중 수증기를 직접 포집하는 방식이며, 이와 더불어 진드기가 자연조건에서 맺힌 물방울을 직접 마시며 수분을 보충한다는 것이 최근 본 연구진의 연구를 통해 밝혀졌다. 물방울에서 획득된 수분은 진드기 침샘의 포도상 부위(유형 I) 또는 중장을 통해 체내로 흡수된다는 것이 형광물질 추적을 통해 확인되었다. 이 연구 결과는 진드기 방제 및 병원체 전파 억제를 위한 전략 개발에 새로운 방향을 제시하였다. 본 종설에서는 진드기 방제를 위한 잠재적 표적인 진드기의 수분조절 및 표피 배설의 생리적 메커니즘을 종합적으로 다룬다.

Keywords

Acknowledgement

DK was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (2019R1G1A1100559) and Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2021R1I1A3055954). YP was supported by NIH grants NIH-NIAID R21 AI135457 and AI163423, 1S10OD026726 and USDA-NIFA, GRANT-13066347. Contribution number 21-xxx-J from the Kansas Agricultural Experiment Station.

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