Abstract
For treating chronic diseases like rheumatoid arthritis, herbal medicines are preferred due to their evident therapeutic effects and lesser side effects as compared to the long-term used conventional drugs. In this study, the anti-rheumatoid arthritis effect of an unexplored marine grass Halodule pinifolia (HP), and a combination of it with Glycyrrhiza glabra (liquorice; LQ), prepared as a conventional suspension (C1) and a lipid nano-emulsion (C1-N) was evaluated in Freund’s complete adjuvant (FCA)- and collagen-induced arthritis (CIA) models. Formulations C1 and C1-N contained standardized extract HP (100 mg/kg) as major active ingredient and liquorice LQ (50 mg/kg) as both active ingredient (anti-inflammatory and anti-ulcer) and sweetening agent. Oral administration of HP and C1 to FCA-induced Sprague–Dawley rats significantly reduced the paw oedema, spleen index, controlled the haematological parameters, cytokine levels (IL-1β, IL-6, TNF-α estimated by ELISA), mRNA expression of cytokines and osteoclast markers (RANK, TRAP and cathepsin K measured by RTPCR). Histopathology and radiological scanning demonstrated lesser joint deterioration in sample-treated rats, as evident phenotypically. The downregulation of CD51 and MMP-3 (western blot) corroborated the anti-arthritic effect of HP and C1. HP showed better results among all. Further, under the CIA model, both C1 and C1-N were found to be potentially active as evidenced by their effect on rat paw oedema, spleen index, haematological parameters, rheumatoid factor, cytokines, osteoclast markers, histology and X-rays. The results proved the anti-arthritic effect of HP and the formulations, particularly the lipid nano-emulsion that showed improved stability as well as activity.
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Acknowledgements
Authors acknowledge Dr. K. Jagan Mohan Reddy, Assistant Professor & Head, Department of Surgery and Radiology, College of Veterinary Science, Korutla, Hyderabad, Telangana, India for his support in radiological data interpretation.
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Authors acknowledge the financial support received from the Department of Science and Technology, Science and Engineering Research Board, New Delhi, India [CRG/2020/002693], Indian Council for Medical Research, New Delhi, India [3/1/2(22)CD/2019-NCD-II] and BITS-Pilani Hyderabad Campus.
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ASB: Conceptualization, supervision and project administration. ASB, OPK and AC: Design of experiments, data analysis and manuscript review. SN, SL and KRR: Experiments, analysis of samples, data analysis and literature survey. ASB and SN: Manuscript writing, review and editing.
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All animal experiment protocols were approved by the Institutional Animal Ethics Committee of BITS-Pilani Hyderabad Campus (BITS-Hyd/IAEC/2019/29).
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Nessa, S., Lavanya, S., Routray, R.K. et al. Anti-rheumatoid arthritis potential of Halodule pinifolia: development, characterization and in vivo evaluation of H. pinifolia-based oral suspension and lipid nano-emulsion. Inflammopharmacol 32, 1203–1223 (2024). https://doi.org/10.1007/s10787-024-01431-0
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DOI: https://doi.org/10.1007/s10787-024-01431-0