The structural organization of Giardia intestinalis cytoskeleton
Ana Paula Rocha Gadelha1, Marlene Benchimol2, Wanderley de Souza3
1INMETRO-National Institute of Metrology, Quality and Technology, Rio de Janeiro, Brazil; UNIGRANRIO-University of Grande Rio, Rio de Janeiro, Brazil.
Abstract:
Giardia intestinalis, the causative agent of giardiasis, has complex cytoskeleton organization with structures involved in motility, adhesion, cell division, and cell differentiation. Microtubules are key components of the cytoskeleton and are the main elements of the ventral disc, median body, funis, in addition to four pairs of flagella. These cytoskeletal elements are basically stable microtubule arrangements. Although tubulins are the main proteins of these elements, molecular and biochemical analyses of Giardia trophozoites have revealed the presence of several new and not yet characterized proteins in these structures, which may contribute to their nanoarchitecture (mainly in the ventral disc). Despite these findings, morphological data are still required for understanding the organization and biogenesis of the cytoskeletal structures. In the study of this complex and specialized network of filaments in Giardia, two distinct and complementary approaches have been used in recent years: (a) transmission electron microscopy tomography of conventionally processed as well as cryo-fixed samples and (b) high-resolution scanning electron microscopy and helium ion microscopy in combination with new plasma membrane extraction protocols. In this review we include the most recent studies that have allowed better understanding of new Giardia components and their association with other filamentous structures of this parasite, thus providing new insights in the role of the cytoskeletal structures and their function in Giardia trophozoites.
Insights
Giardia intestinalis utilizes complex cytoskeletal structures, including microtubules, for essential functions. Recent microscopy reveals novel proteins contributing to the parasite's unique nanoarchitecture and function.
Area of Science:
- Cell Biology
- Parasitology
- Microscopy
Background:
- Giardia intestinalis possesses a complex cytoskeleton crucial for motility, adhesion, and cell division.
- Microtubules form key structures like the ventral disc, median body, funis, and flagella in Giardia trophozoites.
- While tubulins are primary components, uncharacterized proteins also contribute to cytoskeletal nanoarchitecture, particularly in the ventral disc.
Purpose of the Study:
- To review recent advancements in understanding the organization and biogenesis of Giardia intestinalis cytoskeletal structures.
- To highlight novel protein components and their association with filamentous structures within Giardia.
- To provide new insights into the function of cytoskeletal elements in Giardia trophozoites.
Main Methods:
- Transmission electron microscopy tomography (TEMT) of both conventionally processed and cryo-fixed Giardia samples.
- High-resolution scanning electron microscopy (HR-SEM) and helium ion microscopy (HIM).
- Advanced plasma membrane extraction protocols combined with high-resolution microscopy techniques.
Main Results:
- Recent studies have elucidated new protein components within Giardia's cytoskeleton.
- These novel proteins are associated with existing filamentous structures, contributing to nanoarchitecture.
- Improved imaging techniques provide a better understanding of cytoskeletal organization and biogenesis.
Conclusions:
- Advanced microscopy and biochemical analyses are revealing the intricate details of the Giardia cytoskeleton.
- The discovery of new proteins expands our knowledge of the parasite's structural complexity and functional mechanisms.
- Further research into these cytoskeletal elements is essential for understanding Giardia biology and developing therapeutic strategies.
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