Thirdhand Smoke Exposure Affects Mice Pancreas Microstructure

Cigarette residue toxins can accumulate in the body, including the pancreas, which potentially reduces pancreas function. In addition, the active compounds in cigarettes are reporting to interfere with an elevation of reactive oxygen species, leading to disruption of pancreatic microstructures. Furthermore, pancreatic cell dysfunction is responsible for developing diabetes mellitus disease. The objective of this study was to analyze the effect of thirdhand smoke exposure on mice pancreatic microstructure image. It was an in vivo laboratory experimental study with a completely randomized design at the Medical Biology Laboratory of the Universitas Islam Bandung from November 2020–June 2021. The subjects were 20 adult male mice aged 8–10 weeks, weighing 25–30 grams, in good health condition, and randomly divided into two groups (control group and treatment group exposed to thirdhand cigarette smoke for four weeks). After the completion of the exposure period, pancreatic cells isolation was performing. The parameters observed in this study were the number and diameter islet of Langerhans. Data analysis used the independent t test parametric (α=5%). The results showed that the number and diameter islet of Langerhans in the treated group were significantly lower than the control group (p<0.05). The average number in the control group was 9.40±3.20, while in the treatment group was 4.90±2.74 (28% smaller). The average diameter of control was 225.96±50.15 mm, while treatment was 162±49.68 mm (50% lower). In conclusion, thirdhand smoke exposure alters the pancreas microstructure. The toxic compounds on thirdhand cigarette smoke are involving in generating an elevation of free radical levels, depletion of antioxidants, and alteration of signal transduction resulted in acceleration of apoptosis rate of the islet of Langerhans, especially pancreatic β-cells. PENGARUH PAPARAN ASAP ROKOK TERSIER PADA GAMBARAN MIKROSTRUKTUR PANKREAS MENCITToksik residu rokok dapat terakumulasi pada tubuh, termasuk pankeas sehingga dapat menurunkan fungsi pankreas. Selain itu, senyawa aktif dalam rokok dilaporkan meningkatkan radikal bebas yang menyebabkan kerusakan mikrostruktur pankreas. Selanjutnya, disfungsi sel pankreas meningkatkan risiko diabetes melitus. Penelitian ini bertujuan menganalisis pengaruh asap rokok tersier terhadap gambaran mikrostruktur pankreas mencit. Penelitian ini merupakan penelitian eksperimental laboratorium in vivo dengan rancangan acak lengkap di Laboratorium Biologi Medik Universitas Islam Bandung periode November 2020–Juni 2021. Subjek penelitian adalah 20 mencit jantan dewasa berumur 8–10 minggu, bobot 25–30 gram, kondisi sehat, dan dibagi secara acak menjadi dua kelompok (kelompok kontrol dan kelompok perlakuan yang mendapat paparan asap rokok tersier selama empat minggu). Setelah periode pemberian paparan selesai, dilakukan isolasi sel pankreas. Parameter yang diamati dalam penelitian ini adalah jumlah dan diameter pulau Langerhans (islet of Langerhans). Analisis data menggunakan parametrik independent t test (α=5%). Hasil penelitian menunjukkan bahwa jumlah dan diameter pulau Langerhans pada kelompok perlakuan lebih rendah dibanding dengan kelompok kontrol (p<0,05). Jumlah rerata pada kelompok kontrol adalah 9,40±3,20, sedangkan pada kelompok perlakuan 4,90±2,74 (lebih rendah 28%). Diameter rerata pada kelompok kontrol adalah 225,96±50,19 mm dan kelompok perlakuan 162,89±49.68 mm (lebih rendah 50%). Simpulan, paparan asap rokok tersier dapat memengaruhi gambaran mikrostruktur pankreas. Senyawa toksik pada asap rokok tersier diduga terlibat dalam peningkatan kadar radikal bebas, penurunan kadar antioksidan, dan perubahan transduksi sinyal yang mengakibatkan peningkatan laju apoptosis pulau Langerhans, terutama sel β pankreas.

3D Collagen Hydrogel Promotes In Vitro Langerhans Islets Vascularization through ad-MVFs Angiogenic Activity

Adipose derived microvascular fragments (ad-MVFs) consist of effective vascularization units able to reassemble into efficient microvascular networks. Because of their content in stem cells and related angiogenic activity, ad-MVFs represent an interesting tool for applications in regenerative medicine. Here we show that gentle dissociation of rat adipose tissue provides a mixture of ad-MVFs with a length distribution ranging from 33–955 μm that are able to maintain their original morphology. The isolated units of ad-MVFs that resulted were able to activate transcriptional switching toward angiogenesis, forming tubes, branches, and entire capillary networks when cultured in 3D collagen type-I hydrogel. The proper involvement of metalloproteases (MMP2/MMP9) and serine proteases in basal lamina and extracellular matrix ECM degradation during the angiogenesis were concurrently assessed by the evaluation of alpha-smooth muscle actin (αSMA) expression. These results suggest that collagen type-I hydrogel provides an adequate 3D environment supporting the activation of the vascularization process. As a proof of concept, we exploited 3D collagen hydrogel for the setting of ad-MVF–islet of Langerhans coculture to improve the islets vascularization. Our results suggest potential employment of the proposed in vitro system for regenerative medicine applications, such as the improving of the islet of Langerhans engraftment before transplantation.

Phytochemical Evaluation and Anti-Diabetic Effects of Ethanolic Leaf Extract of Petersianthus macrocarpus on Streptozotocin-Induced Diabetic Rats

Aim: The purpose of this study was to evaluate the antidiabetic effect of ethanolic extracts of Petersianthus macrocarpus leaf and its phytochemical analysis using different solvents. Place and Duration of Study: The study was carried out between March and September in 2018 in the Department of Anatomy, Madonna University, Elele. River State, Nigeria. Materials and Methods: Twenty five Wistar rats, weighing between 200-225g were divided into five groups of five rats. Group A (Control) while Groups B, C, D and E were induced with diabetes using streptozotocin firstly 35mg/kg b.w; and 2 weeks later 25mg/kg b.w. Group B (Diabetic control), Group C received 0.5mg/kg b.w of Glibenclamide. Groups D and E received daily 50 and 100 mg/kg b.w of ethanolic leaf extract of P. macrocarpus orally for two weeks. The fasting blood glucose levels were determined weekly for two weeks. At the end of the experiment, the animals were sacrificed and the pancreas was removed for histological procedures. Results: The body weights increased significantly (P<0.05) in 100 mg/kg b.w group when compared to the diabetic control rats weight at the end of the experiment. Also there was a significantly decreased (P<0.05) in blood glucose levels in P. macrocarpus (100mg/kg b.w). The histological section of the pancreas of diabetic control showed eosinophilic material in the islet, shrinkage of the islet of Langerhans while the group treated with 100 mg/kg of extract showed granulated and well prominent pancreatic islet of Langerhans. Phytochemical screening showed methanolic extract of P. macrocarpus leaf having alkaloid, saponin, tannin, phenol, flavonoid, cardiac glycoside, steroids, terpenoids, anthocyanin and anthraquinone. However, cardiac glycosides and steroids were absent in ethanolic extract. Cardiac glycoside and terpenoids were also absent in hexane and acetone extract, while phenol, cardiac glycosides, steroids and anthrocyanin were absent in the water extract. Conclusion: Ethanolic leaf extract of P. macrocarpus ameliorate streptozotocin-induced diabetes in Wistar rats.