Hydrogen sulfide signaling in the central nervous system -Comparison with nitric oxide-

Kimura, Hideo

doi:10.22541/au.159103637.77095049

Cited by 2 publications

(1 citation statement)

References 109 publications

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“…Conversely, a putative sul de-producing enzyme (mpst-1) who protects C. elegans from mitochondrial damage (Qabazard et al, 2014;Ng et al, 2019;Kimura, 2020) was upregulated in AS nematodes. Notably, under AS, L. oneistus might detoxify sul de by producing glutathione and taurine (Rose et al, 2017), as a persul de dioxygenase (ethe-1) and a cysteine dioxygenase (cdo-1) which catalyzes taurine synthesis via cysteine degradation were upregulated.…”

Section: Genes Upregulated In Hypoxic (H) Nematodesmentioning

confidence: 99%

Differential Regulation of Degradation and Immune Pathways Underlies Adaptation of the Ectosymbiotic Nematode Laxus Oneistus to Oxic-Anoxic Interfaces

Paredes

Viehboeck

Markert

et al. 2021

Preprint

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Eukaryotes may experience oxygen deprivation under both physiological and pathological conditions. Because oxygen shortage leads to a reduction in cellular energy production, all eukaryotes studied so far conserve energy by suppressing their metabolism. However, the molecular physiology of animals that naturally and repeatedly experience anoxia is underexplored. One such animal is the marine nematode Laxus oneistus. It thrives, invariably coated by its sulfur-oxidizing symbiont Candidatus Thiosymbion oneisti, in anoxic sulfidic or hypoxic sand. Here, transcriptomics and proteomics showed that, whether in anoxia or not, L. oneistus mostly expressed genes involved in ubiquitination, energy generation, oxidative stress response, immune response, development, and translation. Importantly, ubiquitination genes were also highly expressed when the nematode was subjected to anoxic sulfidic conditions, together with genes involved in autophagy, detoxification and ribosome biogenesis. We hypothesize that these degradation pathways were induced to recycle damaged cellular components (mitochondria) and misfolded proteins into nutrients. Remarkably, when L. oneistus was subjected to anoxic sulfidic conditions, lectin and mucin genes were also upregulated, potentially to promote the attachment of its thiotrophic symbiont. Furthermore, the nematode appeared to survive oxygen deprivation by using an alternative electron carrier (rhodoquinone) and acceptor (fumarate), to rewire the electron transfer chain. On the other hand, under hypoxia, genes involved in costly processes (e.g., amino acid biosynthesis, development, feeding, mating) were upregulated, together with the worm’s Toll-like innate immunity pathway and several immune effectors (e.g., Bacterial Permeability Increasing proteins, fungicides). In conclusion, we hypothesize that, in anoxic sulfidic sand, L. oneistus upregulates degradation processes, rewires oxidative phosphorylation and by reinforces its coat of bacterial sulfur-oxidizers. In upper sand layers, instead, it appears to produce broad-range antimicrobials and to exploit oxygen for biosynthesis and development.

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Section: Genes Upregulated In Hypoxic (H) Nematodesmentioning

confidence: 99%

Differential Regulation of Degradation and Immune Pathways Underlies Adaptation of the Ectosymbiotic Nematode Laxus Oneistus to Oxic-Anoxic Interfaces

Paredes

Viehboeck

Markert

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

Differential regulation of degradation and immune pathways underlies adaptation of the ectosymbiotic nematodeLaxus oneistusto oxic-anoxic interfaces

Paredes

Viehboeck

Markert

et al. 2021

Preprint

View full text Add to dashboard Cite

Eukaryotes may experience oxygen deprivation under both physiological and pathological conditions. Because oxygen shortage leads to a reduction in cellular energy production, all eukaryotes studied so far conserve energy by suppressing their metabolism. However, the molecular physiology of animals that naturally and repeatedly experience anoxia is underexplored. One such animal is the marine nematode Laxus oneistus. It thrives, invariably coated by its sulfur-oxidizing symbiont Candidatus Thiosymbion oneisti, in anoxic sulfidic or hypoxic sand. Here, transcriptomics and proteomics showed that, whether in anoxia or not, L. oneistus mostly expressed genes involved in ubiquitination, energy generation, oxidative stress response, immune response, development, and translation. Importantly, ubiquitination genes were also upregulated when the nematode was subjected to anoxic sulfidic conditions, together with genes involved in autophagy, detoxification and ribosome biogenesis. We hypothesize that these degradation pathways were induced to recycle damaged cellular components (mitochondria) and misfolded proteins into nutrients. Remarkably, when L. oneistus was subjected to anoxic sulfidic conditions, lectin and mucin genes were also upregulated, potentially to promote the attachment of its thiotrophic symbiont. Furthermore, the nematode appeared to survive oxygen deprivation by using an alternative electron carrier (rhodoquinone) and acceptor (fumarate), to rewire the electron transfer chain. On the other hand, under hypoxia, genes involved in costly processes (e.g., amino acid biosynthesis, development, feeding, mating) were upregulated, together with the worm’s Toll- like innate immunity pathway and several immune effectors (e.g., Bacterial Permeability Increasing proteins, fungicides).In conclusion, we hypothesize that, in anoxic sulfidic sand, L. oneistus upregulates degradation processes, rewires oxidative phosphorylation and by reinforces its coat of bacterial sulfur-oxidizers. In upper sand layers, instead, it appears to produce broad-range antimicrobials and to exploit oxygen for biosynthesis and development.

show abstract

Hydrogen sulfide signaling in the central nervous system -Comparison with nitric oxide-

Cited by 2 publications

References 109 publications

Differential Regulation of Degradation and Immune Pathways Underlies Adaptation of the Ectosymbiotic Nematode Laxus Oneistus to Oxic-Anoxic Interfaces

Differential Regulation of Degradation and Immune Pathways Underlies Adaptation of the Ectosymbiotic Nematode Laxus Oneistus to Oxic-Anoxic Interfaces

Differential regulation of degradation and immune pathways underlies adaptation of the ectosymbiotic nematodeLaxus oneistusto oxic-anoxic interfaces

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