Archya Sengupta

A single probe for sensing both acetate and aluminum(III): visible region detection, red fluorescence and human breast cancer cell imaging

A single probe (L) can recognise both AcO− and Al3+ as prepared by coupling 2-hydroxy-1-naphthaldehyde with hydrazine. Both the ions provide visible range emission and absorbance upon interaction with the probe allowing their naked eye detections. AcO− sensing is attributed to the formation of hydrogen-bond while Al3+ recognition is due to the combination of three effects, viz. inhibition of excited-state proton transfer (ESPT), CHN isomerization and chelation-enhanced fluorescence (CHEF).

In Vivo Effect of Arsenic Trioxide on Keap1-p62-Nrf2 Signaling Pathway in Mouse Liver: Expression of Antioxidant Responsive Element-Driven Genes Related to Glutathione Metabolism

Arsenic is a Group I human carcinogen, and chronic arsenic exposure through drinking water is a major threat to human population. Liver is one of the major organs for the detoxification of arsenic. The present study was carried out in mice in vivo after arsenic treatment through drinking water at different doses and time of exposure. Arsenic toxicity is found to be mediated by reactive oxygen species. Nuclear factor (erythroid-2 related) factor 2 (Nrf2)/Keap1 (Kelch-like ECH-associated protein 1)/ARE (antioxidant response element)—driven target gene system protects cells against oxidative stress and maintains cellular oxidative homeostasis. Our result showed 0.4 ppm, 2 ppm, and 4 ppm arsenic trioxide treatment through drinking water for 30 days and 90 days induced damages in the liver of Swiss albino mice as evidenced by histopathology, disturbances in liver function, induction of heat shock protein 70, modulation of trace elements, alteration in reduced glutathione level, glutathione-s-transferase and catalase activity, malondialdehyde production, and induction of apoptosis. Cellular Nrf2 protein level and mRNA level increased in all treatment groups. Keap1 protein as well as mRNA level decreased concomitantly in arsenic treated mice. Our study clearly indicates the important role of Nrf2 in activating ARE driven genes related to GSH metabolic pathway and also the adaptive response mechanisms in arsenic induced hepatotoxicity.

Rhodamine derived colorimetric and fluorescence mercury(II) chemodosimeter for human breast cancer cell (MCF7) imaging

Condensation of rhodaminehydrazone with naphthalene-1-carboxaldehyde generates a colourless probe, RDHDNAP that can selectively detect Hg2+ through generation of a pink color along with significant fluorescence enhancement. The binding constant and lowest detection limit for Hg2+ are 2.0 × 105 M−1 and 3 × 10−7 M respectively. Hg2+ imaging in human breast cancer cells (MCF7) under a fluorescence microscope is achieved.

Possible Cytotoxic Activity of Annona muricata Leaves in Huh-7 Human Liver Cancer Cells

Background: Hepatocellular carcinoma (HCC) is the fifth most basic type of disease on the planet. Regardless of such a variety of choices for HCC treatment, the cure rate for patients is generally low especially among patients who are ineligible for surgical or percutaneous methods. HCC is generally viewed as a chemotherapy-safe malady. These disadvantages require the proceeded with scan for novel HCC treatments. The plant Annona muricata has been accounted for to have acetogenins as major phytoconstitutent which are in charge of number of exercises and one of them is anticancer and antiproliferative impacts against different tumors. The present study was intended to assess the anticancer potential of aqueous extract of Annona muricata leaves (AEAML) against Huh-7 human liver cancer cells.Methods: The cytotoxic impact of AEAML on Huh-7 cells was tried by MTT examine. Cells were tested with 0.5, 1.0, and 1.5 mg/ml concentrate of AEAML for 24 hours. The apoptotic genes Bax and Bcl-2 expression were assessed by utilizing RT-PCR, and after that decide the protein expression of caspase 3 and 9 by western blot. Comet assay was performed in Huh-7 cells for the DNA damage and apoptosis.Results: Cell viability investigation uncovered the cytotoxic impact of AEAML on Huh-7cell line. RT-PCR of anti- apoptotic Bcl-2 and pro-apoptotic Bax demonstrated that there is down and up control, individually, of these two qualities with an unfriendly impact. Additionally, AEAML treatment set off the actuation of caspase-9 followed by caspase-3 protein expression. Also, AEAML incited DNA damage and apoptosis on Huh-7 cells as uncovered by Comet tail length.Conclusion: Annona muricata has antiproliferative and cytotoxic impacts on Huh-7 cells, conceivably through apoptosis induction.

Expression Pattern of Myogenic Regulatory Transcription Factor mRNAs in the Embryo and Adult Labeo rohita (Hamilton, 1822)

Understanding the regulation of skeletal muscle development is important to meet the increasing demand of Indian major carp Labeo rohita. Myogenic regulatory factors (MRFs) along with myocyte specific enhancer factor 2 (MEF2) play the pivotal role in the determination and differentiation of skeletal muscle. The majority of skeletal muscle genes require both MRFs and MEF2 family members to activate their transcription. In this study, the expression pattern of MyoD, myf-5, myogenin, and MEF2A was observed from 6 h after fertilization to 12 months of age using semiquantitative RT-PCR as well as real-time PCR method. MyoD and myf-5 mRNAs were expressed at high level at the early embryonic stages. Myogenin and MEF2A were expressed after MyoD and myf-5 and remained active up to adult stage. Expression of MyoD was lower than that of Myf-5 after the 5th month. Partial sequencing of MyoD, myf-5, and MEF2A was done to draw phylogeny. In phylogenetic study, Labeo MyoD, MEF2A and myf-5 were found to be closely related to those of common carp. The present investigation suggests that the four transcription factors play pivotal role in the regulation of muscle growth of Labeo rohita in an overlapping and interconnected way.