TY - JOUR

T1 - Cadmium-induced oxidative stress, histopathology, and transcriptome changes in the hepatopancreas of freshwater crayfish (Procambarus clarkii)

AU - Zhang, Yu

AU - Li, Zheyu

AU - Kholodkevich, Sergey

AU - Sharov, Andrey

AU - Feng, Yujie

AU - Ren, Nanqi

AU - Sun, Kai

PY - 2019/5/20

Y1 - 2019/5/20

N2 - Cadmium (Cd) is a common contaminant in environment. Crayfish are considered suitable for indicating the impact of heavy metals on the environment. However, there is limited information on the mechanisms causing damage to the hepatopancreas of Procambarus clarkii exposed to Cd. We exposed adult male P. clarkii to 2.0, 5.0, and 10.0 mg/L Cd for 24, 48, and 72 h to explore Cd toxicity. Afterwards, we measured bioaccumulations in the hepatopancreas and determined malondialdehyde (MDA), superoxide dismutase (SOD), catalase (CAT), and glutathione S-transferase (GST). Additionally, the hepatopancreas histopathology was analyzed and the transcriptome analysis of the P. clarkii hepatopancreas under Cd stress was conducted. The results revealed that hepatopancreas could accumulate Cd in a time- and dose-dependent manner. Cd induced significant changes in MDA content and antioxidant enzyme activity. Severe histological alterations were observed in crayfish hepatopancreas. After 72 h exposure to 2.0, 5.0, and 10.0 mg/L Cd, transcriptome analysis identified 1061, 747, and 1086 differentially expressed genes (DEGs), respectively. Exposure to 5.0 mg/L Cd inhibited heme binding, tetrapyrrole binding, iron ion binding and activity of oxidoreductase and sulfotransferase, while exposure to 10.0 mg/L Cd enhanced the export of matters from nucleus. In the hepatopancreas treated with 10.0 mg/L Cd, pathways related to diseases and immune system were significantly enriched. Meanwhile, 31, 31, 24, 7, and 12 identified DEGs were associated with the oxidation-reduction process, immune system, ion homeostasis, digestion and absorption, and ATPases, respectively. Our study provides comprehensive information for exploring the toxic mechanisms of Cd and candidate biomarkers for aquatic Cd risk evaluation.

AB - Cadmium (Cd) is a common contaminant in environment. Crayfish are considered suitable for indicating the impact of heavy metals on the environment. However, there is limited information on the mechanisms causing damage to the hepatopancreas of Procambarus clarkii exposed to Cd. We exposed adult male P. clarkii to 2.0, 5.0, and 10.0 mg/L Cd for 24, 48, and 72 h to explore Cd toxicity. Afterwards, we measured bioaccumulations in the hepatopancreas and determined malondialdehyde (MDA), superoxide dismutase (SOD), catalase (CAT), and glutathione S-transferase (GST). Additionally, the hepatopancreas histopathology was analyzed and the transcriptome analysis of the P. clarkii hepatopancreas under Cd stress was conducted. The results revealed that hepatopancreas could accumulate Cd in a time- and dose-dependent manner. Cd induced significant changes in MDA content and antioxidant enzyme activity. Severe histological alterations were observed in crayfish hepatopancreas. After 72 h exposure to 2.0, 5.0, and 10.0 mg/L Cd, transcriptome analysis identified 1061, 747, and 1086 differentially expressed genes (DEGs), respectively. Exposure to 5.0 mg/L Cd inhibited heme binding, tetrapyrrole binding, iron ion binding and activity of oxidoreductase and sulfotransferase, while exposure to 10.0 mg/L Cd enhanced the export of matters from nucleus. In the hepatopancreas treated with 10.0 mg/L Cd, pathways related to diseases and immune system were significantly enriched. Meanwhile, 31, 31, 24, 7, and 12 identified DEGs were associated with the oxidation-reduction process, immune system, ion homeostasis, digestion and absorption, and ATPases, respectively. Our study provides comprehensive information for exploring the toxic mechanisms of Cd and candidate biomarkers for aquatic Cd risk evaluation.

KW - Cadmium

KW - Hepatopancreas

KW - Histopathology

KW - Oxidative stress

KW - Procambarus clarkii

KW - Transcriptome

KW - PROTEIN

KW - HEAVY-METALS

KW - CRYSTAL-STRUCTURE

KW - CONTAMINATION

KW - RED SWAMP CRAYFISH

KW - TOXICITY

KW - BIOACCUMULATION

KW - RESPONSES

KW - ANTIOXIDANT

KW - GENE-EXPRESSION

UR - http://www.scopus.com/inward/record.url?scp=85062043264&partnerID=8YFLogxK

U2 - 10.1016/j.scitotenv.2019.02.159

DO - 10.1016/j.scitotenv.2019.02.159

M3 - Article

AN - SCOPUS:85062043264

VL - 666

SP - 944

EP - 955

JO - Science of the Total Environment

JF - Science of the Total Environment

SN - 0048-9697

ER -