SKN-1-independent transcriptional activation of glutathione S-transferase 4 (GST-4) by EGF signaling

Detienne, Giel; Walle, Pieter Van de; Haes, Wouter De; Schoofs, Liliane; Temmerman, Liesbet

doi:10.1080/21624054.2016.1230585

Cited by 35 publications

(33 citation statements)

References 51 publications

(95 reference statements)

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“…The induction of the gcs-1p::GFP in positive control worms was used to indicate Phase II detox skn-1 activation. The gcs-1 reporter was chosen because, unlike gst-4 , it can only be activated by skn-1 [ 42 ]. A one hour heat shock at 37 °C with a four hour recovery at 20 °C was used as a positive control, modified from An et al., 2003 [ 35 ].…”

Section: Methodsmentioning

confidence: 99%

Stress and timing associated with Caenorhabditis elegans immobilization methods

Manjarrez

Mailler

2020

Heliyon

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Background Caenorhabditis elegans is a model organism used to study gene, protein, and cell influence on function and behavior. These studies frequently require C. elegans to be immobilized for imaging or laser ablation experiments. There are a number of known techniques for immobilizing worms, but to our knowledge, there are no comprehensive studies of the various agents in common use today. New method This study determines the relationship between concentration, immobilization time, exposure time, and recovery likelihood for several immobilization agents. The agents used in this study are 1-Phenoxy-2-propanol, levamisole, sodium azide, polystyrene beads, and environmental cold shock. These tests are conducted using a humidified chamber to keep chemical concentrations consistent. Each of these agents is also tested to determine if they exhibit stress-related after effects using the gcs-1 , daf-16 , hsp-4 , hif-1 , hsp-16.2, and tmem-135 stress reporters. Results We present a range of quick mount immobilization and recovery conditions for each agent tested. This study shows that, under controlled conditions, 1-Phenoxy-2-propanol shows significant stress from the daf-16 reporter. While 1-Phenoxy-2-propanol and sodium azide both create stress related after effects with long term recovery in the case of the hsp-16.2 reporter. Comparison with existing method(s) This study shows that commonly used concentrations of immobilizing agents are ineffective when evaporation is prevented. Conclusions To improve reproducibility of results it is essential to use consistent concentrations of immobilizing agents. It is also critically important to account for stress-related after effects elicited by immobilization agents when designing any experiment.

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Section: Methodsmentioning

confidence: 99%

Stress and timing associated with Caenorhabditis elegans immobilization methods

Manjarrez

Mailler

2020

Heliyon

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“…Royalactin (also known as Major Royal Jelly Protein 1 or MRJP1) was prepared from RJ via ultracentrifugation, according to 6,7 . Royalactin-containing NGM plates were prepared by adding 1.7 µg mL -1 royalactin (unless stated otherwise) to liquid NGM immediately before pouring the plates.…”

Section: Royalactin Preparationmentioning

confidence: 99%

“…In essence, GFP is irreversibly targeted for proteasomal proteolysis. Fluorescence was quantified analogous to the automated method described in Detienne et al 7 , using a microplate reader to measure thousands of nematodes simultaneously (Flexstation II, Molecular Devices).…”

Section: In Vivo 20s Proteasome Activitymentioning

confidence: 99%

“…Transcriptional reporter strains GFP fluorescence of the C. elegans transcriptional reporter strains, CL2070 (hsp-16.2p::gfp), SJ4005 (hsp-4p::gfp) and SJ4100 (hsp-6p::gfp) was quantified using an automated method, as described in Detienne et al 7 . Animals were grown without FUdR in the presence and absence of royalactin on NGM plates seeded with OP50, until the late L4 stage, before transfer to a 96 well plate for fluorescence quantification.…”

Section: Proteotoxic Aggregation Assaysmentioning

confidence: 99%

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Royalactin induces copious longevity via increased translation and proteasome activity in C. elegans

Detienne

Walle

Haes

et al. 2018

Preprint

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As demonstrated in various animal models, organismal longevity can be achieved via interventions that at the mechanistic level could be considered to entail 'defensive' responses: most long-lived mutants focus on somatic maintenance, while reducing growth pathway signalling and protein translation and turnover. We here provide evidence that the opposite mechanism can also lead to longevity and improved health.We report on the mode of action of royalactin, a glycoprotein activator of epidermal growth factor signalling, capable of extending lifespan in several animals. We show that in Caenorhabditis elegans, royalactin-induced longevity depends on increased protein translation and entails increased proteasome activity. We propose the term 'copious longevity' to describe this newly-elucidated mechanism. In contrast to what is true for many other lifespan-extending interventions, we observed no obvious trade-offs between royalactininduced longevity and several life history traits. Our data point towards increased protein turnover to support healthy ageing, and provide a means for future comparative studies of defensive vs. copious mechanisms.

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“…Our data reveal that glucose-fed bacteria which are high in AGEs promote an environment that causes animals to exhibit signs of oxidative stress including strong and consistent suppression of gst-4 (glutathione transferase-4) involved in the regulation of the Phase II oxidative stress response 33 . Analysis of transcriptional activation of gst-4 is often used as a read-out for oxidative stress tolerance 34 . Therefore, we next generated a loss of function allele of gst-4 by CRISPR/Cas9.…”

mentioning

confidence: 99%

Bacterial processing of glucose modulatesC. eleganslifespan and healthspan

Kingsley

Seo

Allen

et al. 2020

Preprint

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Intestinal microbiota play an essential role in the health of a host organism. Here, we define how commensal Escherichia coli (E. coli) alters its host after long term exposure to glucose using a C. elegans-E. coli system. Our data reveal that bacterial processing of glucose, rather than direct ingestion by the animal, results in reduced lifespan and healthspan, including reduced locomotion, oxidative stress resistance, and heat stress resistance in C. elegans. Chronic exposure of E. coli to glucose produces growth defects and increased advanced glycation end products within the E. coli. These negative effects are abrogated when the E. coli is not able to process the additional glucose and by the addition of the anti-glycation compound carnosine. Physiological changes of the host C. elegans are accompanied by dysregulation of detoxifying genes including glyoxalase, glutathione-S-transferase, and superoxide dismutase. Loss of gst-4 shortens C. elegans lifespan and blunts the animal's response to a glucose-fed bacteria diet. Taken together, we reveal that added dietary sugar may alter intestinal microbial E. coli to decrease lifespan and healthspan of the host and define the critical role of detoxification genes in maintaining health during a chronic high-sugar diet.

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SKN-1-independent transcriptional activation of glutathione S-transferase 4 (GST-4) by EGF signaling

Cited by 35 publications

References 51 publications

Stress and timing associated with Caenorhabditis elegans immobilization methods

Stress and timing associated with Caenorhabditis elegans immobilization methods

Royalactin induces copious longevity via increased translation and proteasome activity in C. elegans

Bacterial processing of glucose modulatesC. eleganslifespan and healthspan

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