scholarly journals Metabolic Flow of C6 Volatile Compounds From LOX-HPL Pathway Based on Airflow During the Post-harvest Process of Oolong Tea

2021 ◽  
Vol 12 ◽  
Author(s):  
Zi-wei Zhou ◽  
Qing-yang Wu ◽  
Zi-xin Ni ◽  
Qing-cai Hu ◽  
Yun Yang ◽  
...  
Keyword(s):  
Gene Expression ◽  
Fatty Acid ◽  
Oxygen Deficit ◽  
Regulation Mechanism ◽  
Tea Leaves ◽  
Ester Content ◽  
Oolong Tea ◽  
Opposite Trend ◽  
Adh Activity ◽  
Postharvest Processing

Aroma is an essential quality indicator of oolong tea, a tea derived from the Camellia sinensis L. plant. Carboxylic 6 (C6) acids and their derivative esters are important components of fatty acid (FA)-derived volatiles in oolong tea. However, the formation and regulation mechanism of C6 acid during postharvest processing of oolong tea remains unclear. To gain better insight into the molecular and biochemical mechanisms of C6 compounds in oolong tea, a combined analysis of alcohol dehydrogenase (ADH) activity, CsADH2 key gene expression, and the FA-derived metabolome during postharvest processing of oolong tea was performed for the first time, complemented by CsHIP (hypoxia-induced protein conserved region) gene expression analysis. Volatile fatty acid derivative (VFAD)-targeted metabolomics analysis using headspace solid-phase microextraction–gas chromatography time-of-flight mass spectrometry (HS-SPEM-GC-TOF-MS) showed that the (Z)-3-hexen-1-ol content increased after each turnover, while the hexanoic acid content showed the opposite trend. The results further showed that both the ADH activity and CsADH gene expression level in oxygen-deficit-turnover tea leaves (ODT) were higher than those of oxygen-turnover tea leaves (OT). The C6-alcohol-derived ester content of OT was significantly higher than that of ODT, while C6-acid-derived ester content showed the opposite trend. Furthermore, the HIP gene family was screened and analyzed, showing that ODT treatment significantly promoted the upregulation of CsHIG4 and CsHIG6 gene expression. These results showed that the formation mechanism of oolong tea aroma quality is mediated by airflow in the lipoxygenase–hydroperoxide lyase (LOX-HPL) pathway, which provided a theoretical reference for future quality control in the postharvest processing of oolong tea.

Coumarin-Fatty Acid Conjugates as Potential ERα/AKT-1 Antagonists for ER Positive Breast Cancer

2020 ◽  
Vol 20 (4) ◽  
pp. 437-449
Author(s):  
Jubie Selvaraj ◽  
Jameera B.A. John ◽  
Nanjan M. Joghee ◽  
Justin Antony ◽  
Ashish Wadhwani ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Gene Expression ◽  
Fatty Acid ◽  
Binding Assay ◽  
Uterine Cancer ◽  
Design Development ◽  
Structure Based Drug Design ◽  
Ic50 Values ◽  
Cancer Activity

Background: : Current drugs used for the treatment of hormone-dependent breast cancer function as anti-estrogens in the breast, in addition to Estrogen Receptor (ER) agonists in the uterus, thus elevate a woman’s risk of developing uterine cancer. This is due to the lack of selective binding and partial agonistic effect of these drugs towards estrogen receptors. In recent years, therefore, researchers have turned their attention towards antiestrogens devoid of these agonist properties and thus have a mechanism of action different from the existing drugs. Objective:: In this context, we report here the design, development and in vitro evaluation of some novel pharmacophores containing coumarin and fatty acid scaffolds for their anti-breast cancer activity. Methods: : A library of coumarin-fatty acid conjugates was designed using structure-based drug design approach. The conjugates which have shown good in silico results were then synthesized, characterized and evaluated for their anti-breast cancer activity by MTT assay, Apoptotic assay, Cell proliferation assay, Estrogen binding assay and Gene expression study. Results: Out of the fifteen compounds screened, two compounds, SAC-2 and LNAC-2, showed good activity with IC50 values 22µg/ml, 25μg/ml, respectively. These compounds suppressed the proliferation of ER overexpressed MCF-7 cells, increased ERα degradation and hence inactivate the ERα pathway. ER binding assay and gene expression RT-PCR study reveal that SAC-2 downregulated the expression of ERα receptor and AKT-1 gene. Conclusion:: Compound SAC-2 is a good antagonist to ER and hence has a potential for treating breast cancer and other cancers where AKT plays an important role.

scholarly journals Long-chain fatty acid-induced changes in gene expression in neonatal cardiac myocytes

2000 ◽  
Vol 41 (1) ◽  
pp. 41-47 ◽  
Author(s):  
Karin A. J.M. van der Lee ◽  
Michaël M. Vork ◽  
Johan E. De Vries ◽  
Peter H.M. Willemsen ◽  
Jan F.C. Glatz ◽  
...  
Keyword(s):  
Gene Expression ◽  
Fatty Acid ◽  
Cardiac Myocytes ◽  
Chain Fatty Acid ◽  
Long Chain Fatty Acid ◽  
Induced Changes ◽  
Long Chain

scholarly journals Gene Expression Profile and Co-Expression Network of Pearl Gentian Grouper under Cold Stress by Integrating Illumina and PacBio Sequences

Animals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1745
Author(s):  
Ben-Ben Miao ◽  
Su-Fang Niu ◽  
Ren-Xie Wu ◽  
Zhen-Bang Liang ◽  
Bao-Gui Tang ◽  
...  
Keyword(s):  
Gene Expression ◽  
Cold Stress ◽  
Differential Expression Analysis ◽  
Endocrine System ◽  
Control Group ◽  
Regulation Mechanism ◽  
Rna Seq ◽  
Cold Tolerant ◽  
Stress Signals ◽  
Membrane Changes

Pearl gentian grouper (Epinephelus fuscoguttatus ♀ × Epinephelus lanceolatus ♂) is a fish of high commercial value in the aquaculture industry in Asia. However, this hybrid fish is not cold-tolerant, and its molecular regulation mechanism underlying cold stress remains largely elusive. This study thus investigated the liver transcriptomic responses of pearl gentian grouper by comparing the gene expression of cold stress groups (20, 15, 12, and 12 °C for 6 h) with that of control group (25 °C) using PacBio SMRT-Seq and Illumina RNA-Seq technologies. In SMRT-Seq analysis, a total of 11,033 full-length transcripts were generated and used as reference sequences for further RNA-Seq analysis. In RNA-Seq analysis, 3271 differentially expressed genes (DEGs), two low-temperature specific modules (tan and blue modules), and two significantly expressed gene sets (profiles 0 and 19) were screened by differential expression analysis, weighted gene co-expression networks analysis (WGCNA), and short time-series expression miner (STEM), respectively. The intersection of the above analyses further revealed some key genes, such as PCK, ALDOB, FBP, G6pC, CPT1A, PPARα, SOCS3, PPP1CC, CYP2J, HMGCR, CDKN1B, and GADD45Bc. These genes were significantly enriched in carbohydrate metabolism, lipid metabolism, signal transduction, and endocrine system pathways. All these pathways were linked to biological functions relevant to cold adaptation, such as energy metabolism, stress-induced cell membrane changes, and transduction of stress signals. Taken together, our study explores an overall and complex regulation network of the functional genes in the liver of pearl gentian grouper, which could benefit the species in preventing damage caused by cold stress.

scholarly journals Utilization of a Gas-Sensing System to Discriminate Smell and to Monitor Fermentation during the Manufacture of Oolong Tea Leaves

Micromachines ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 93
Author(s):  
Ting-Shiang Tseng ◽  
Mei-Hui Hsiao ◽  
Po-An Chen ◽  
Shu-Yen Lin ◽  
Shih-Wen Chiu ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Critical Factor ◽  
Current Method ◽  
Sensory Function ◽  
Oxide Semiconductor ◽  
Tea Leaves ◽  
Linear Discriminant ◽  
Oolong Tea ◽  
Olfactory Sense ◽  
On Line

The operational duration of shaking tea leaves is a critical factor in the manufacture of oolong tea; this duration influences the formation of its flavor and fragrance. The current method to control the duration of fermentation relies on the olfactory sense of tea masters; they monitor the entire process through their olfactory sense, and their experience decides the duration of shaking and setting. Because of this human factor and olfactory fatigue, it is difficult to define an optimum duration of shaking and setting; an inappropriate duration of shaking and setting deteriorates the quality of the tea. In this study, we used metal-oxide-semiconductor gas sensors to establish an electronic nose (E-nose) system and tested its feasibility. This research was divided into two experiments: distinguishing samples at various stages and an on-line experiment. The samples of tea leaves at various stages exhibited large differences in the level of grassy smell. From the experience of practitioners and from previous research, the samples could be categorized into three groups: before the first shaking (BS1), before the shaking group, and after the shaking group. We input the experimental results into a linear discriminant analysis to decrease the dimensions and to classify the samples into various groups. The results show that the smell can also be categorized into three groups. After distinguishing the samples with large differences, we conducted an on-line experiment in a tea factory and tried to monitor the smell variation during the manufacturing process. The results from the E-nose were similar to those of the sense of practitioners, which means that an E-nose has the possibility to replace the sensory function of practitioners in the future.

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