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Research Article
Makoto Ishimota
The Institute of Environmental Toxicology
Corresponding Author
ORCiD: https://orcid.org/0000-0003-4686-0244
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To ascertain the tolerance mechanisms of aquatic organisms to artificial chemicals, intergenerational sensitivity changes of Chironomus yoshimatsui to a carbamate pesticide (pirimicarb) and pharmaceutical chemical (diazepam) were investigated. The larvae (< 48-h-old) in each generation were exposed to both chemicals for 48 h and then the surviving chironomids were cultured until the fifth generation (F0–F4) without chemical addition. The 48-h 50% effective concentration (EC50) value of chironomids was determined for each generation. In the pirimicarb treatment group, the EC50 values significantly increased in F3 and F4, and those in the diazepam treatment group slightly increased. Catalase, Cytochrome P450 and hemoglobin (Hb) mRNA levels were monitored to see whether these were related to the trans-generational sensitivity. Although the generalized linear model results showed that the sensitivity to diazepam was slightly increased in the diazepam treatment, we could not find any mRNA levels related to sensitivity alteration. In contrast, the model approach showed that the chironomids exposed to pirimicarb trans-generationally became tolerant with increasing Hb mRNA levels. Therefore, they might decrease their oxidative chemical stress by modifying Hb gene transcription.
Keywords
Tolerance, Chironomidae, Hemoglobin, Catalase, Carbamates, Pharmaceutical chemical
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View the published article at Ecotoxicology.
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Posted 15 Jul, 2021
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Received 15 Jul, 2021
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On 24 Jun, 2021
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See the published version of this preprint at Ecotoxicology.
This is a preprint, a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Learn more about In Review
Research Article
Makoto Ishimota
The Institute of Environmental Toxicology
Corresponding Author
ORCiD: https://orcid.org/0000-0003-4686-0244
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Published
View the published article at Ecotoxicology.
Version (no preprint)
Posted 15 Jul, 2021
Reviews received
Received 15 Jul, 2021
Reviewers invited
Invitations sent on 15 Jul, 2021
Editor invited
On 27 Jun, 2021
Editor assigned
On 24 Jun, 2021
First submitted
On 24 Jun, 2021
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
Subject Areas
Toxicology
License:
This work is licensed under a CC BY 4.0 License. Read Full License
View the published article at Ecotoxicology.
To ascertain the tolerance mechanisms of aquatic organisms to artificial chemicals, intergenerational sensitivity changes of Chironomus yoshimatsui to a carbamate pesticide (pirimicarb) and pharmaceutical chemical (diazepam) were investigated. The larvae (< 48-h-old) in each generation were exposed to both chemicals for 48 h and then the surviving chironomids were cultured until the fifth generation (F0–F4) without chemical addition. The 48-h 50% effective concentration (EC50) value of chironomids was determined for each generation. In the pirimicarb treatment group, the EC50 values significantly increased in F3 and F4, and those in the diazepam treatment group slightly increased. Catalase, Cytochrome P450 and hemoglobin (Hb) mRNA levels were monitored to see whether these were related to the trans-generational sensitivity. Although the generalized linear model results showed that the sensitivity to diazepam was slightly increased in the diazepam treatment, we could not find any mRNA levels related to sensitivity alteration. In contrast, the model approach showed that the chironomids exposed to pirimicarb trans-generationally became tolerant with increasing Hb mRNA levels. Therefore, they might decrease their oxidative chemical stress by modifying Hb gene transcription.
Figure 1
Figure 2
Figure 3
Figure 4
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