Effect of docosahexaenoic acid as a chemopreventive agent on experimentally induced hamster buccal pouch carcinogenesis

PURPOSE

The current study was directed to investigate the effectiveness of docosahexaenoic acid (DHA) as a chemopreventive agent on experimentally induced hamster buccal pouch (HBP) carcinogenesis.

MATERIAL AND METHODS

In this study we used 40 Syrian male hamsters, five weeks old, were divided into 4 groups (GI, GII, GIII, and GIV) of 10 animals in each as follows, GI: Topical application of liquid paraffin alone (thrice a week for 14 weeks), GII: Topical application of 7, 12 dimethyl benz[a]anthracene (DMBA) alone (0.5% in liquid paraffin, thrice a week for 14 weeks), GIII: Topical application of DMBA (0.5% in liquid paraffin, thrice a week for 14 weeks) + Oral administration of DHA (125 mg/kg b.w. in 1 ml distilled water by oral gavage, thrice a week for 14 weeks on alternative days of DMBA application), GIV: Oral administration of DHA alone (125 mg/kg b.w. in 1 ml distilled water by oral gavage, thrice a week for 14 weeks).

RESULTS

Gross observations and histopathological findings revealed that, in GI: normal stratified squamous epithelium, in GII: well and moderately differentiated squamous cell carcinoma (SCC), in GIII: variable results ranges from hyperkeratosis, hyperkeratosis and focal hyperplasia, mild dysplasia, and well differentiated SCC with superficial invasion of tumor cells not extended to deeper areas, while in GIV: normal similar to GI. Immunohistochemical results indicated that oral DHA treatment to DMBA treated hamsters restored the normal expression of bcl-2.

CONCLUSION

Our results indicated that DHA has the potential to be a dietary chemopreventive agent due to its capacity to improve carcinogen detoxification and to block/suppress the initiation and promotion stages of experimentally produced HBP carcinogenesis.

Effect of Docosahexaenoic Acid as a Chemopreventive Agent on Experimentally Induced Hamster Buccal Pouch Carcinogenesis.. [DOI: 10.20944/preprints202201.0307.v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0]

The purpose of the current study was directed to investigate the effectiveness of docosahexaenoic acid (DHA) as a chemopreventive agent on experimentally induced hamster buccal pouch (HBP) carcinogenesis; Material and methods: 40 Syrian male hamsters, five weeks old, were divided into 4 groups of 10 animals in each as follows, GI: Topical application of liquid paraffin alone (thrice a week for 14 weeks), GII: Topical application of 7, 12 dimethyl benz[a]anthracene (DMBA) alone (0.5 % in liquid paraffin, thrice a week for 14 weeks), GIII: Topical application of DMBA (0.5 % in liquid paraffin, thrice a week for 14 weeks) + Oral administration of DHA (125 mg/kg b.w. in 1 ml distilled water by oral gavage, thrice a week for 14 weeks on alternative days of DMBA application), GIV : Oral administration of DHA alone (125 mg/kg b.w. in 1 ml distilled water by oral gavage, thrice a week for 14 weeks); Results: Gross observations and histopathological findings revealed a-GI: normal stratified squamous epithelium b- GII: well and moderately differentiated squamous cell carcinoma (SCC) c-: GIII: showed variable results ranges from hyperkeratosis, hyperkeratosis and focal hyperplasia, mild dysplasia, and well differentiated SCC with superficial invasion of tumor cells not extended to deeper areas d: GIV: normal similar to GI. Immunohistochemical results revealed that oral DHA treatment to DMBA treated hamsters restored the normal expression of bcl-2; Conclusion: DHA has the potential to be a dietary chemopreventive agent due to its capacity to improve carcinogen detoxification and to block/suppress the initiation and promotion stages of experimentally produced HBP carcinogenesis.

Immunohistochemical analysis of CD34 and PCNA expression in salivary and laryngeal adenoid cystic carcinoma

Background/purpose: Adenoid cystic carcinomas (ACC) are malignant tumors that affect major and minor salivary glands. LACC is an extremely rare location for this type of tumour. This study describes the immunohistochemical analysis of CD34 and PCNA expression in salivary and laryngeal ACC. Materials and methods: The study included 40 formalin-fixed paraffin-embedded blocks were used, 20 of them were previously diagnosed as SACC, and 20 as LACC. All sections were stained with hematoxylin and eosin (H&E) and immunohistochemical marker to detect CD34 and PCNA protein. Results: Regarding the expression of CD34, SACC had recorded the highest mean area % (31.58), while LACC recorded the lowest mean area % (14.25) and the comparison revealed that there was a highly significant difference between these lesions where P value was (<0.001) concerning the expression of PCNA, SACC had recorded the highest mean area % (36.28), while LACC recorded the lowest mean area % (20.7) and the comparison revealed that there was a highly significant difference between these lesions where P value was (<0.001). Conclusions: immunohisto­chemical analyses presented here indicated that LACC tends to nonaggressive oncological behavior and angiogenesis when compared to SACC.

Immunohistochemical evaluation of CD31 and D2-40, expression in oral squamous cell carci-noma

Background: The present study was carried out to evaluate the relation between angiogenesis, and tumor stage of oral squamous cell carcinoma (OSCC).Materials and methods: Thirty formalin-fixed paraffin embedded blocks were used, ten of them were previously diagnosed as well differentiated OSCC, ten moderately differentiated OSCC and ten poorly differentiated OSCC. To determine the expression of CD31 and D2-40 proteins, streptavidin-biotin immunoperoxidase staining technique was used. The areas with the most vascular density (hot spots) were determined. The stained vessels were counted independently in intratumoral and peritumoral stroma. Results: CD 31 protein showed positive expression in the peritumoral and intratumoral blood vessels subjacent to the malignant invading nests. D2-40 expression was positive in lymphatic vessel in the peritumoral and intratumoral stroma subjacent to the invading nests. The highest mean values of both CD31 and D2-40 proteins expression were recorded in poor differentiated OSSC followed by moderate differentiated OSSC then well differentiated OSSC. There was statistically significant difference found between the three studied groups regarding CD31 and D2-40 levels. Also there was statistically significant positive correlation found between CD31 level and D2-40 level.Conclusion: CD31 and D2-40 are related to stage of OSCC and are consistent with angiogenesis in tumor progression.