High Dose Flaxseed Exposure Induces Dose-Dependent Histopathological Alterations in Rat Lung Tissue: An Experimental Model of Cyanogenic Toxicity
Abstract
Purpose: Flaxseed (Linum usitatissimum L.) is a widely consumed functional food rich in omega-3 fatty acids, lignans, and fiber. However, due to its cyanogenic glycoside content, excessive consumption may lead to toxic effects. This study aimed to evaluate the histopathological effects of high-dose oral flaxseed administration on rat lung tissue.
Materials and Methods: Thirty-two adult female Wistar Albino rats were randomly divided into four groups (n=8 each): Control, Low Dose (1.4 g/kg/day), Medium Dose (2.8 g/kg/day), and High Dose (5.6 g/kg/day). Flaxseed was administered via oral gavage for seven days. At the end of the experiment, the rats were sacrificed under anesthesia. Lung tissues were fixed in 10% neutral for-malin, stained with H&E, and examined under light microscopy
Results: No pathological changes were observed in the control and low-dose groups. In the medium-dose group, vascular congestion was noted. The high-dose group exhibited vascular congestion, mononuclear cell infiltration, and interalveolar septal thickening. These findings indicate that flaxseed administration induces dose-dependent inflammatory and structural alterations in lung tissue
Conclusion: Short-term high-dose flaxseed intake causes significant histopathological changes in rat lung tissue. Findings such as vascular congestion, inflammatory infiltration, and septal thickening suggest potential pulmonary toxicity. The absence of similar findings at lower doses supports a dose-dependent relationship. These results emphasize the need for cautious use of functional herbal products and encourage further biochemical and molecular studies to elucidate underlying mechanisms.
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References
- 1. Oomah BD, Mazza G, Kenaschuk EO. Cyanogenic compounds in flaxseed. J Agric Food Chem. 1992:40(8);1346-1348. doi:10.1021/jf00020a010
- 2. Rabetafika HN, Van Remoortel V, Danthine S, Paquot M, Blecker C. Flaxseed proteins: food uses and health benefits. Int J Food Sci Technol. 2011:46(2);221-228. doi:10.1111/j.1365-2621.2010.02477.x
- 3. Mueed A, Shibli S, Jahangir M, Jabbar S, Deng Z. A comprehensive review of flaxseed (Linum usitatissimum L.): healthaffecting compounds, mechanism of toxicity, detoxification, anticancer and potential risk. Crit Rev Food Sci Nutr. 2023:63(32);11081-11104. doi:10.1080/10408398.2022.2092718
- 4. İşleroğlu H, Yıldırım ZYM. Fonksiyonel bir gıda olarak keten tohumu. J Agric Fac Gaziosmanpasa Univ (JAFAG). 2005:(2);23-30. doi:10.17129/jafag.2005.15
- 5. Nelson L. Acute cyanide toxicity: mechanisms and manifestations. J Emerg Nurs. 2006:32(4);S8-S11. doi:10.1016/j.jen.2006.05.012
- 6. Baker A, Garner MC, Kimberley KW, Sims DB, Stordock JH, Taggart RP, Walton DJ. Cyanide toxicity of freshly prepared smoothies and juices frequently consumed. Eur J Nutr Food Saf. 2018:8(4);215. doi:10.9734/ejnfs/2018/44004
- 7. Banea-Mayambu JP, Tylleskär T, Tylleskär K, Gebre-Medhin M, Rosling H. Dietary cyanide from insufficiently processed cassava and growth retardation in children in the Democratic Republic of Congo (formerly Zaire). Ann Trop Paediatr. 2000:20(1);34-40. doi:10.1080/02724930092048
- 8. Armağan İ, Yeşilot Ş. Excessive use of flaxseed may pose a threat to kidney tissue: an experimental study. Med J SDU. 2023:30(1);89-96. doi:10.17343/sdutfd.1247065
Details
Primary Language
English
Subjects
Emergency Medicine, Clinical Sciences (Other)
Journal Section
Research Article
Authors
İlkay Armağan
0000-0002-8080-9429
Türkiye
Publication Date
April 29, 2026
Submission Date
August 5, 2025
Acceptance Date
December 6, 2025
Published in Issue
Year 2026 Volume: 10 Number: 1
