Role of ureogenesis in tackling problems of ammonia toxicity during exposure to higher ambient ammonia in the air-breathing walking catfishclarias batrachus

2003 ◽  
Vol 28 (6) ◽  
pp. 733-742 ◽  
Author(s):  
Nirmalendu Saha ◽  
Shritapa Datta ◽  
Kuheli Biswas ◽  
Zaiba Y. Kharbuli
Keyword(s):  
Ammonia Toxicity ◽  
Air Breathing

Role of Free Amino Acids in Renal Tissue of Air-Breathing Catfish, Heteropneustes Fossilis Under-Desiccation Stress (Mud Dwelling)

2018 ◽  
Vol 6 (1) ◽  
pp. 68-74
Author(s):  
Gitalee Bhuyan ◽  
◽  
Nirmalendu Saha ◽  
Keyword(s):  
Free Amino ◽  
Fold Increase ◽  
Renal Tissue ◽  
Ammonia Toxicity ◽  
Desiccation Stress ◽  
Heteropneustes Fossilis ◽  
Eastern India ◽  
Air Breathing ◽  
North Eastern

The Indian air-breathing catfish, Heteropneustes fossilis faces various environmental constraints throughout the year leading to the problem of accumulation of toxic ammonia. Water restricted mud dwelling condition is a common environmental stress (desiccation stress) for catfishes in North Eastern India during winter. The fish is able to survive inside moist peat for months. In the present study the air breathing singhi catfish H. fossilis was kept inside mud peat for 30 days mimicking their normal habitat in winter and the changing pattern of free amino acid (FAAs) content was investigated in renal tissue. Under desiccation, a significant accumulation of ammonia and FAA, mainly glutamine, alanine, glycine, glutamate and serine have been observed in the renal tissue with approximately 2.56 and 1.56 fold increase. Thus, it appears that the Indian air-breathing catfish handle the ammonia toxicity by conversion of ammonia to some non-essential FAAs.

The Effects of Branchial Denervation and Pseudobranch Ablation on Cardioventilatory Control in an Air-Breathing Fish

1991 ◽  
Vol 161 (1) ◽  
pp. 347-365 ◽  
Author(s):  
DAVID J. McKENZIE ◽  
MARK L. BURLESON ◽  
DAVID J. RANDALL
Keyword(s):  
Cardiovascular Responses ◽  
Sodium Cyanide ◽  
Air Breathing ◽  
Ventilatory Responses ◽  
Reflex Bradycardia ◽  
Afferent Information ◽  
Gill Ventilation ◽  
Air Ventilation ◽  
Amia Calva

Present address and address for reprint requests: Istituto di Scienze Farmacologiche, via Balzaretti 9, Università di Milano, Milano 20133, Italy. The role of sensory afferent information from the gills of Amia calva in cardiovascular and ventilatory control was investigated by bilateral branchial denervation and pseudobranch ablation. Aquatic hypoxia or 1 mg of sodium cyanide (NaCN) in the water flowing over the gills stimulated bradycardia, and gill and air ventilation in sham-operated fish. Sodium cyanide, noradrenaline (NA) and adrenaline (A) infusion into the dorsal aorta increased gill ventilation, and NA and A infusion also stimulated tachycardia and an increase in blood pressure. Following denervation and pseudobranch ablation, O2 consumption (V·OO2), airbreathing frequency (fAB) and arterial O2 tension (PaOO2) declined, and circulating NA levels increased, as compared with sham-operated fish. Cardiovascular and air-breathing responses to hypoxia were abolished and gill ventilatory responses attenuated. All ventilatory and cardiovascular responses to NaCN were abolished and gill ventilatory responses to NA and A were attenuated in animals following denervation and pseudobranch ablation. These results demonstrate that O2-sensitive chemoreceptors in the gills and pseudobranch control reflex bradycardia and air-breathing responses in Amia, but that gill ventilatory responses to hypoxia, NA and A are partially mediated by extrabranchial mechanisms. Plasma NA levels increased during hypoxia in shamoperated and denervated animals, indicating that circulating NA may have mediated gill ventilatory responses in denervated animals.

Role of Taurine in Cellular Volume Regulation in Erythrocytes of Air-Breathing Catfish (Clarias magur) Under Osmotic Stress

2019 ◽  
Vol 89 (4) ◽  
pp. 1389-1397
Author(s):  
Bodhisattwa Banerjee ◽  
Debaprasad Koner ◽  
Priyanka Lal ◽  
Suman Kumari ◽  
Rubaiya Hasan ◽  
...  
Keyword(s):  
Osmotic Stress ◽  
Volume Regulation ◽  
Air Breathing ◽  
Cellular Volume

scholarly journals Development of central respiratory control in anurans: The role of neurochemicals in the emergence of air-breathing and the hypoxic response

2019 ◽  
Vol 270 ◽  
pp. 103266 ◽  
Author(s):  
Tara A. Janes ◽  
Jean-Philippe Rousseau ◽  
Stéphanie Fournier ◽  
Elizabeth A. Kiernan ◽  
Michael B. Harris ◽  
...  
Keyword(s):  
Respiratory Control ◽  
Hypoxic Response ◽  
Air Breathing

Role of NMDA receptors in acute liver failure and ammonia toxicity: Therapeutical implications

2009 ◽  
Vol 55 (1-3) ◽  
pp. 113-118 ◽  
Author(s):  
Regina Rodrigo ◽  
Omar Cauli ◽  
Jordi Boix ◽  
Nisrin ElMlili ◽  
Ana Agusti ◽  
...  
Keyword(s):  
Liver Failure ◽  
Acute Liver Failure ◽  
Nmda Receptors ◽  
Ammonia Toxicity

Molecular mechanism of acute ammonia toxicity: role of NMDA receptors

2002 ◽  
Vol 41 (2-3) ◽  
pp. 95-102 ◽  
Author(s):  
Pilar Monfort ◽  
Elena Kosenko ◽  
Slaven Erceg ◽  
Juan-José Canales ◽  
Vicente Felipo
Keyword(s):  
Nmda Receptors ◽  
Molecular Mechanism ◽  
Ammonia Toxicity
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