Preprint / Version 1

Ashwagandha-loaded nanocapsules improved the behavioral alterations, and blocked MAPK and induced Nrf2 signaling pathways in a hepatic encephalopathy rat model

Authors

  • Heba Khalil Department of Veterinary Hygiene and Management, Faculty of Veterinary Medicine, Cairo University, Giza, 12211 Egypt
  • Islam Khalil Department of Pharmaceutics, College of Pharmaceutical Sciences and Drug Manufacturing, Misr University of Science and Technology (MUST), 6th of October, Giza, 12582 Egypt
  • Asmaa Al-Mokaddem Department of Pathology, Faculty of Veterinary Medicine, Cairo University, Giza Square, Giza, 12211 Egypt
  • Marwa Hassan Department of Immunology, Theodor Bilharz Research Institute, Kornaish El Nile, Warrak El-Hadar, Imbaba, P.O. 30, Giza, 12411 Egypt
  • Riham El-Shiekh Department of Pharmacognosy, Faculty of Pharmacy, Cairo University, Kasr el Aini st., Cairo, 11562 Egypt
  • Hesham Eliwa Department of Pharmacology and Toxicology, College of Pharmacy and Drug Manufacturing, Misr University of Science and Technology (MUST), 6th October, Giza, 12566 Egypt
  • Azza Tawfek Department of Clinical Pathology, Faculty of Veterinary Medicine, Cairo University, Giza, 12211 Egypt
  • Walaa El-Maadawy Department of Pharmacology, Theodor Bilharz Research Institute, Kornaish El Nile, Warrak El-Hadar, Imbaba, P.O. 30, Giza, 12411 Egypt

Keywords:

Ashwagandha, Bipolymeric nanocapsules, Hepatic encephalopathy, Cognition, Nrf2 pathway, MAPK pathway

Abstract

Ashwagandha (ASH), a vital herb in Ayurvedic medicine, demonstrated potent preclinical hepato- and neuroprotective effects. However, its efficacy is limited due to low oral bioavailability. Accordingly, we encapsulated ASH extract in chitosan–alginate bipolymeric nanocapsules (ASH-BPNCs) to enhance its physical stability and therapeutic effectiveness in the gastrointestinal tract. ASH-BPNC was prepared by emulsification followed by sonication. The NCs showed small particle size (< 220 nm), zeta-potential of 25.2 mV, relatively high entrapment efficiency (79%), physical stability at acidic and neutral pH, and in vitro release profile that extended over 48 h. ASH-BPNC was then investigated in a thioacetamide-induced hepatic encephalopathy (HE) rat model. Compared with free ASH, ASH-BPNC improved survival, neurological score, general motor activity, and cognitive task-performance. ASH-BPNC restored ALT, AST and ammonia serum levels, and maintained hepatic and brain architecture. ASH-BPNC also restored GSH, MDA, and glutathione synthetase levels, and Nrf2 and MAPK signaling pathways in liver and brain tissues. Moreover, ASH-BPNC downregulated hepatic NF-κB immunohistochemical expression. Moreover, the in vivo biodistribution studies demonstrated that most of the administered ASH-BPNC is accumulated in the brain and hepatic tissues. In conclusion, chitosan–alginate BPNCs enhanced the hepatoprotective and neuroprotective effects of ASH, thus providing a promising therapeutic approach for HE. Graphical abstract Keywords: Ashwagandha, Bipolymeric nanocapsules, Hepatic encephalopathy, Cognition, Nrf2 pathway, MAPK pathway

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