فهرست مطالب lida eftekhari-vash

The use of plants to treat diseases has a long history. Today, due to the side effects of common drugs, turning to these natural resources is more mandatory than before. This study aimed to construct and characterize nanoliposomes containing Glycyrrhiza glabra extract and to evaluate its toxicity on healthy HFF cell lines and MCF-7 breast cancer cell lines.

Initially, licorice extract was obtained using a succulent extraction method. Subsequently, a liposomal system was prepared from SPC and cholesterol using the thin film method, and Glycyrrhiza glabra extract was loaded into the liposomes. Their physicochemical parameters were investigated using zeta-sizer and SEM devices, and the release pattern of the extract was calculated at 37ºC and 42 ºC. Finally, the toxicity of this nanosystem containing the extract on the MCF-7 breast cancer cell line and HFF skin was investigated by the MTT method.

Encapsulation, particle size, polydispersity index, and zeta potential are 64.16±3.45%, 131 nm, 0.131, and -19.1 mV, respectively. Release of the extract was slow at similar temperatures to healthy and cancer cells. Also, liposome extract was more toxic to the MCF-7 cell line than free extract, and both were less toxic to the HFF cell line.

The findings showed that the liposomal system incorporating the extract had advantageous physical and chemical characteristics. It also displayed high toxicity on the MCF-7 cell line but low toxicity on the HFF cell line. This indicates that the liposomal system may be a promising method for delivering plant compounds to specific cells.

Considering the role of hydrocarbon pollution in cancer, this research aims to investigate the degradation rate of benzene and toluene using bacteria extracted from soil, as well as to examine the compounds resulting from this decomposition.

Thirty soil samples, including agricultural soil and soil contaminated with hydrocarbons, were collected from the northwestern provinces of Iran. Bacteria were cultured in agar medium and subsequently extracted. To assess the decomposition of benzene and toluene, bacteria were separately cultured in a mineral culture medium containing a specific amount of benzene or toluene, and the percentage of decomposition was determined. Additionally, GC-Mass analysis was conducted to identify the compounds resulting from the decomposition of benzene and toluene. The type of bacteria responsible for the degradation was determined using biochemical methods and PCR

All the extracted bacteria exhibited the ability to decompose benzene and toluene, with the highest decomposition rates observed in bacteria extracted from refinery soil, averaging 55.85% for benzene and 49.39% for toluene. Agricultural and refinery soil bacteria displayed a higher decomposition rate for benzene compared to toluene. The majority of the compounds obtained from the decomposition had lower toxicity than benzene and toluene. Furthermore, the presence of the Streptomyces strain was confirmed in environments with the highest decomposition rates for benzene and toluene.

Streptomyces strains indigenous to soils contaminated with hydrocarbons demonstrated a high efficiency in converting benzene and toluene into organic compounds, reducing the associated risks.

The use of plants as therapeutic drugs has long been common among human beings. The Glycyrrhiza glabra is one of the medicinal plants with many therapeutic properties. However, using this herb in traditional methods faces some challenges. The use of pharmaceutical nano-carriers such as liposomes is one of the new strategies to overcome these challenges. In this regard, the current study aimed to synthesize and characterize liposomal nano-carriers containing the G. glabra hydroalcoholic extract to improve its therapeutic effects.

After the extraction of the G. glabra root by the Soxhlet method, nano-liposomes containing G. glabra extracts were synthesized by the thin-film preparation method. Then, the encapsulation efficiency (EE) rate and drug release pattern of nanoliposome were examined using the spectrophotometry method. Next, physicochemical properties such as size, zeta potential, morphology, and non-interaction of the nano-system with the extract were investigated by dynamic-light-scattering (DLS), atomic force microscope (AFM), and Fourier transform infrared spectroscopy (FTIR) methods, and finally, the toxicity of the nano-system on human foreskin fibroblast cells was assessed using the MTT method.

Nano-liposomes containing licorice extracts with the EE of 2.3±75.32% were from the type of slow release and controlled release, having a size of 111.4±1.2 nm, a surface charge of -53.6±6.3, and a dispersion index of 0.210±0.13, and they had no interaction with the loaded extract. The results of the MTT test also demonstrated that the synthesized nano-liposomes were non-toxic on normal cells.

Overall, the findings proved that synthesized nano-liposomes with proper physicochemical properties can be a suitable carrier for the G. glabra extract and thus cause stability and improve the therapeutic effects of this herbal extract as a medicinal plant.

The use of medical herbs because of their reasonable price and availability is rapidly increasing but it faces many challenges. Researchers are trying to overcome these challenges by designing nano-drug delivery carriers such as liposome. In this study, a formulation of liposomal system containing Hedera Helix extract was synthesized and its toxicity on normal cells and physicochemical characteristics were evaluated.

  In the first step, extraction of Hedera Helix was done by succulent method. In the next step, nano-liposomes were prepared by thin film method from phosphatidylcholine and cholesterol and by using hydration inactive method the extract was loaded into them. Then the encapsulation rate and the release pattern were assayed by spectrophotometry method, the size of nanoparticles and their zeta potential were evaluated by the DLS, the non-interaction between the extract and the nanosystem was assessed by FT-IR technique and the morphology of the nanoparticles was examined by AFM microscope and finally the non-toxicity of the system on normal cells was assayed by MTT method.

The results of this study showed that nano-liposomes containing Hedera Helix extract having 48.6 nm of diameter, 0.406 dispersion index, -37.3 ± 1.72 mV zeta potential and 82.67 ± 1.12 encapsulation efficiency are follow the slow releasing drug pattern. FTIR and AFM data demonstrated that there is no interaction between the extract and nanoliposomes and nanoliposomes have appropriate morphology. Finally, the results of the MTT assay confirmed the non-toxicity activity of nano-liposome.

In this study, physicochemical studies of nanosystems after loading Hedera Helix extract into liposomal nanosystems showed that the system is a slow-release and anionic type with acceptable size, morphology and acceptable encapsulation rate. The synthesized liposomes could be a suitable carrier for the Hedera Helix extract and increase its stability, solubility and thus improve its therapeutic performance.

Streptomyces tendae is one of the most prolific actinobacteria with a wide range of biotechnological applications. Genomic data can help in better understanding and exploration of important microorganisms, however, there is a few genomic information available for this species.

Molecular identification, pH and salt tolerance of an actinobacterium, designated Streptomyces tendae UTMC 3329, isolated from a tea field soil were done. Also, genomic DNA was extracted and sequenced using Illumina platform with MPS (massively parallel sequencing) Illumina technology. Gene annotation and bioinformatic analysis were done using appropriate software and servers.

The draft genome is ~8.7 megabase pairs, containing 7557 predicted coding sequences. The strain was able to grow at pH 5-12 and 0-10% NaCl. The maximum growth rate of the bacterium was obtained at pH 7. The gene clusters involved in central carbon metabolism, phosphate regulation, transport system, stress responses were revealed. It was shown the presence of gene clusters of polyketides, ribosomally and non-ribosomally synthesized peptides. Various genes were found in xenobiotic degradation pathways and heavy metal resistance.

The current genomic information which reveals biological features, as well as the biotechnological potential of this acid and alkaline tolerant actinobacterium, can be implemented for further research on the species.