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2017 ; 12
(11
): e0188133
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Nematocytes: Discovery and characterization of a novel anculeate hemocyte in
Drosophila falleni and Drosophila phalerata
#MMPMID29141015
Bozler J
; Kacsoh BZ
; Bosco G
PLoS One
2017[]; 12
(11
): e0188133
PMID29141015
show ga
Immune challenges, such as parasitism, can be so pervasive and deleterious that
they constitute an existential threat to a species' survival. In response to
these ecological pressures, organisms have developed a wide array of novel
behavioral, cellular, and molecular adaptations. Research into these immune
defenses in model systems has resulted in a revolutionary understanding of
evolution and functional biology. As the field has expanded beyond the limited
number of model organisms our appreciation of evolutionary innovation and unique
biology has widened as well. With this in mind, we have surveyed the hemolymph of
several non-model species of Drosophila. Here we identify and describe a novel
hemocyte, type-II nematocytes, found in larval stages of numerous Drosophila
species. Examined in detail in Drosophila falleni and Drosophila phalerata, we
find that these remarkable cells are distinct from previously described hemocytes
due to their anucleate state (lacking a nucleus) and unusual morphology. Type-II
nematocytes are long, narrow cells with spindle-like projections extending from a
cell body with high densities of mitochondria and microtubules, and exhibit the
ability to synthesize proteins. These properties are unexpected for enucleated
cells, and together with our additional characterization, we demonstrate that
these type-II nematocytes represent a biological novelty. Surprisingly, despite
the absence of a nucleus, we observe through live cell imaging that these cells
remain motile with a highly dynamic cellular shape. Furthermore, these cells
demonstrate the ability to form multicellular structures, which we suggest may be
a component of the innate immune response to macro-parasites. In addition, live
cell imaging points to a large nucleated hemocyte, type-I nematocyte, as the
progenitor cell, leading to enucleation through a budding or asymmetrical
division process rather than nuclear ejection: This study is the first to report
such a process of enucleation. Here we describe these cells in detail for the
first time and examine their evolutionary history in Drosophila.