プラズモディアム・スポロゾイトの移動は,感染前に細胞を通過する
M M Mota1, G Pradel, J P Vanderberg
1Department of Pathology, New York University School of Medicine, 341 East 25 Street, New York, NY 10010, USA.
まとめ
マラリア寄生虫 (Plasmodium sporozoites) は,血を破って細胞に侵入し,真空球を形成しない. このユニークな侵入と細胞の移動は,寄生虫の発達とマラリアのライフサイクルの完成に不可欠です.
科学分野:
- 細胞生物学 細胞生物学
- 寄生虫学とは,寄生虫学である.
- 感染症 感染症は感染症です.
背景:
- 細胞内病原菌は,通常,真空球形成経由で宿主細胞に侵入する.
- マラリア寄生虫の感染段階であるプラズモディウム・スポロゾイトは,感染のために効率的な細胞侵入を必要とします.
- プラズモディアム・スポロゾイトの侵入メカニズムを理解することは,マラリア対策戦略の開発の鍵です.
研究 の 目的:
- プラズモディアム・スパロゾイトの細胞侵入の代替メカニズムを調査する.
- 最初の宿主細胞の相互作用を超えて,スポロゾイトの侵入のプロセスを解明する.
- マラリア寄生虫の生命周期における細胞移動の役割を決定する.
主な方法:
- ライブ画像顕微鏡で,宿主細胞とのプラズモディアム・スポロゾイトの相互作用を観察する.
- スポロゾイトの侵入時の宿主細胞のプラズマ膜の整合性の分析.
- ホスト組織内のスポロゾイトの移動を追跡する.
主要な成果:
- プラズモジアム・スポロゾイトは宿主細胞のプラズマ膜を破り,その後急速に修復します.
- このエントリーメカニズムは,従来の真空球形成を回避し,寄生虫をサイトゾールに即座に放出することを可能にします.
- スポロゾイトは,寄生虫の真空球を通って肝細胞に感染を起こす前に,複数の宿主細胞を通って移動する.
結論:
- プラズモディアム・スポロゾイトは,膜破裂と修復を含むユニークな非真空の侵入経路を使用します.
- 多数の宿主細胞を通過する細胞塩基の移動は,プラズモディアム・スポロゾイトの発達と感染性にとって不可欠である.
- この移動行動は,哺乳類の宿主におけるマラリア寄生虫のライフサイクルを完了させる上で極めて重要です.
関連する概念動画
Contact-dependent Signaling
Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
Gap Junctions
In animal cells, gap junctions are formed...
Gap Junctions
In animal cells, gap junctions are formed...
Symbiosis
Symbiotic relationships are long-term, close interactions between individuals of different species that affect the distribution and abundance of those species. When a relationship is beneficial to both species, this is called mutualism. When the relationship is beneficial to one species but neither beneficial nor harmful to the other species, this is called commensalism. When one organism is harmed to benefit another, the relationship is known as parasitism. These types of relationships often...
Diversity of Protists II
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...
Diversity of Protists IV
Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...
Colonisation of Pathogens
Pathogen colonization of host tissues is a critical step in the development of infectious diseases. Various pathogenic microorganisms, including bacteria, fungi, viruses, and protozoa, have evolved complex strategies to attach to, invade, and persist within host environments. These mechanisms enable pathogens to establish infections, evade immune responses, and resist antimicrobial treatments.Attachment to Host CellsIn bacteria, colonization typically begins with adherence to host epithelial...
Malaria
Malaria pathogenesis in humans reflects a delicate interplay between parasite biology and host response. Clinical illness reflects a host’s immune response to the parasite’s asexual replication cycle, which is often asymptomatic in individuals with partial immunity. From the parasite's perspective, transmission between mosquito and human with minimal host pathology is evolutionarily advantageous. Among the six Plasmodium species infecting humans, P. falciparum and P. vivax dominate in global...


