1.Traditional Chinese Medicine Intervention in Diarrhea-predominant Irritable Bowel Syndrome Based on Gut-brain Axis: A Review
Jinchan PENG ; Jinxiu WEI ; Zhu LIU ; Lijian LIU ; Liqun LI ; Chengning YANG ; Guangwen CHEN ; Jianfeng LI ; Sheng XIE
Chinese Journal of Experimental Traditional Medical Formulae 2025;31(8):311-319
Diarrhea-predominant irritable bowel syndrome (IBS-D) is a common digestive system disease with high prevalence and recurrence rates for years, high treatment costs, and serious impacts on patients' quality of life and economic burden. Therefore, it is important to explore new and safe treatment methods. The pathogenesis of IBS-D is complex, in which the gut-brain axis is a key factor. The gut-brain axis, a bidirectional signaling pathway connecting the gastrointestinal tract and the central nervous system, regulates gastrointestinal motility, secretion, and immune responses, playing a key role in the occurrence and development of IBS-D. Up to now, antidiarrheal agents, probiotics, and neurotransmitter modulators are the main methods for the clinical treatment of IBS-D. Although they can partially curb the progression of this disease, the therapeutic effects remain to be improved. Studies have confirmed that traditional Chinese medicine (TCM) has significant advantages in the treatment of IBS-D since it can regulate the gut-brain axis via multiple pathways and targets to improve the gastrointestinal motility and strengthen immune defenses. However, there is a lack of systematic reviews on the regulation of the gut-brain axis by TCM in the treatment of IBS-D. Based on the review of IBS-D-related articles published in recent years, this paper systematically summarized the relationship between the gut-brain axis and IBS-D and the role of TCM in the treatment, providing new ideas for the treatment of IBS-D.
2.Reviews and Recommendations in Comparative Studies on Quality of Wild and Cultivated Chinese Crude Drugs
Yapeng WANG ; Changsheng YUAN ; Jinxiu QIAN ; Yihan WANG ; Yanmeng LIU ; Yunxiang LIU ; Tiegui NAN ; Liping KANG ; Zhilai ZHAN ; Lanping GUO ; Luqi HUANG
Chinese Journal of Experimental Traditional Medical Formulae 2024;30(1):1-20
By reviewing the research history on quality comparison between wild and cultivated Chinese crude drugs, this paper systematically combed the relevant research reports since the 1950s, and summarized and analyzed the results of existing comparative studies, and found that the existing comparative research on the quality of wild and cultivated Chinese crude drugs were mainly focused on several aspects, including characteristics, microstructures, chemical compositions, pharmacodynamic effects, and genetic diversity. Among these, comparative studies of chemical compositions have been the dominant approach, with a particular emphasis on comparing the contents of index components. However, research on pharmacodynamic effects remained relatively limited. Due to various factors such as sample quantity, sample origin, growth period and cultivation methods, the differences in quality between wild and cultivated Chinese crude drugs vary significantly. In general, most wild Chinese crude drugs exhibited higher quality than cultivated products, with significant differences in their characteristics. The contents and proportions of some chemical components underwent noticeable changes, particularly with a marked increase in the proportion of primary metabolites after cultivation. The quality of cultivated Chinese crude drugs is closely related to the cultivation practices employed. Chinese crude drugs produced through wild nurturing, simulated wild planting, ecological cultivation, and other similar methods demonstrate quality levels comparable to those of wild Chinese crude drugs. Based on the analysis results, it is recommended to explicitly specify the cultivation practices and cultivation period of cultivated Chinese crude drugs in comparative studies of the quality between wild and cultivated Chinese crude drugs. Multiple technical approaches, including characteristics, microscopy, non-targeted metabolomics combined with quantitative analysis of differential components, and bioefficacy evaluation, should be employed to comprehensively assess the quality disparities between wild and cultivated Chinese crude drugs. Moreover, research efforts should be intensified to investigate the changes in pharmacodynamic effects resulting from differences in plant cell wall composition, primary metabolites, and secondary metabolites, in order to guide the production of high-quality Chinese crude drugs.
3.Quality Evaluation of Atractylodis Macrocephalae Rhizoma in Different Production Methods Based on Traditional Traits
Jinxiu QIAN ; Yihan WANG ; Yapeng WANG ; Guoliang YU ; Qiuxiang PAN ; Jiawei SHI ; Meiping CHEN ; Yangqing LIU ; Lun LU ; Yanmeng LIU ; Tiegui NAN ; Liping KANG ; Zhilai ZHAN
Chinese Journal of Experimental Traditional Medical Formulae 2024;30(1):43-52
ObjectiveBased on the experience of traditional quality evaluation, the quality of Atractylodis Macrocephalae Rhizoma(AMR) with different production methods such as direct seeding, transplanting after seedling raising, topping and non-topping, and difference in growth years was compared. MethodVernier caliper was used to measure the trait data of AMR in different production methods. Paraffin sections of AMR with different production methods were made by saffron solid green staining, and the microstructure was observed. The contents of water-soluble and alcohol-soluble extracts in AMR with different production methods were determined according to the 2020 edition of Chinese Pharmacopoeia. The content of water-soluble total polysaccharides in AMR with different production methods was detected by sulfuric acid-anthrone method. Fiber analyzer was used to detect the content of fiber components in AMR with different production methods. The contents of monosaccharides, oligosaccharides and some secondary metabolites in AMR with different production methods were detected by ultra performance liquid chromatography(UPLC), and the differences of chemical components were compared by multivariate statistical analysis methods such as principal component analysis(PCA) and partial least squares-discriminant analysis(PLS-DA). ResultIn terms of traits, the 3-year-old AMR with direct seeding and without topping was close to the high-quality AMR with "phoenix-head and crane-neck, strong sweetness and clear aroma" recorded in ancient materia medica, followed by the 3-year-old AMR with topping after transplanting, while the 2-year-old AMR with topping after transplanting with high market circulation rate was generally fat and strong with mild odor. In the microscopic aspect, the arrangement of xylem vessels and fiber bundles in the 3-year-old samples formed two obvious rings. Compared with the 2-year-old samples cultivated in Bozhou and Zhejiang, the 3-year-old samples without topping after transplanting had more wood fibers. In terms of chemical composition, the contents of 70% ethanol extract, fructose, glucose, sucrose, 1-kestose, atractylenolide Ⅰ, chlorogenic acid, neochlorogenic acid, cryptochlorogenic acid and other components in 3-year-old AMR with direct seeding and without topping were significantly higher than those in the other three samples(P<0.05). The contents of cellulose, 70% ethanol extract, sucrose, atractylenolide Ⅰ, atractylone and other components in 3-year-old AMR with topping after transplanting were significantly higher than those in the 2-year-old AMR with high market circulation rate(P<0.05), while the contents of water-soluble extract and water-soluble total polysaccharides in 2-year-old samples with topping after transplanting were significantly higher than those in the 3-year-old AMR with topping after transplanting, direct seeding and without topping(P<0.05). ConclusionUnder the current mainstream production mode, too much manual intervention makes AMR heavily enriched in polysaccharides and increased the yield, but the accumulation of sweet substances, fragrant substances and fiber substances is insufficient, which affects its quality. The current quality standard of AMR has some shortcomings in guiding the high quality production of it, it is suggested to revise the quality standard of AMR, supplement the quantitative analysis of secondary metabolites, and strengthen the production of imitation wild AMR.
4.Research progress of active components and compounds of traditional Chinese medicine improving liver fibrosis by regulating JAK/STAT signaling pathway
Siming DENG ; Lijian LIU ; Liqun LI ; Chengning YANG ; Jinxiu WEI ; Jianfeng LI ; Mingzhu HUANG ; Lili XIE
China Pharmacy 2024;35(15):1923-1927
Hepatic fibrosis is a pathological process of chronic liver injury. Without timely intervention and treatment, liver fibrosis may eventually lead to liver cirrhosis and cancer. Janus kinase (JAK)/signal transducer and activator of transcription (STAT) signaling pathway is closely associated with the occurrence and development of liver fibrosis. Based on this, this paper summarized and analyzed the mechanism and effects of active ingredients and compounds of traditional Chinese medicine improving liver fibrosis based on JAK/STAT signaling pathway. It is found that the active ingredients and compounds of traditional Chinese medicine that promote blood circulation and remove blood stasis (ingredients such as ethanol extract of Euonymus alatus and paclitaxel, as well as compounds such as Ershiwuwei songshi pill and Ganfukang), clear away heat and toxic material (ingredients such as betulinic acid, total flavonoids from Persicaria perfoliata, as well as compounds such as Pianzaihuang and Kehuang capsules), and sooth the liver and promote qi circulation (ingredients such as fraxetin and cucurbitacin B, as well as compounds such as Chaihu shugan powder and Xiaochaihu decoction) can all relieve liver fibrosis by inhibiting the activity of the JAK/STAT signaling pathway, reducing inflammatory reactions, and inhibiting the proliferation of hepatic stellate cells.
5.Clinical features and initial outcomes in elderly patients with idiopathic membranous nephropathy
Jinxiu LIANG ; Fangxiao XIA ; Wenke HAO ; Wenxue HU ; Yanhua WU ; Feng YU ; Zhi ZHAO ; Wei LIU
Chinese Journal of Geriatrics 2024;43(2):168-174
Objective:The purpose of this study was to examine the clinical features and initial treatment outcomes of elderly individuals with idiopathic membranous nephropathy.Methods:This study retrospectively analyzed the clinical characteristics and therapeutic effect of hospitalized patients aged 60 years or older with renal-biopsy-proven idiopathic membranous nephropathy for at least one year.Results:This study enrolled a total of 91 elderly patients with IMN, consisting of 51 males(56.0%)and 40 females(44.0%). The median age of the patients was 67 years.The urinary protein creatinine ratio(uPCR)and urinary albumin creatinine ratio(uACR)of the patients were 4 454.3 mg/g and 2 258.5 mg/g, respectively.The median 24-hour urinary protein and urinary albumin levels were 5 098.2 mg/24 h and 2 800.6 mg/24 h, respectively.The average estimated glomerular filtration rate(eGFR)was(60.5±20.4)ml·min -1·1.73 m -2.Out of the total of 61 patients, 67.0% achieved remission, including complete and partial remission, within a year of renal biopsy.The levels of uPCR and uACR were significantly higher in the non-remission group compared to the remission group(5 462.5 vs.2 271.1 mg/g, P<0.001; 2 774.4 vs.1 320.0 mg/g, P=0.001). Additionally, the levels of 24h urinary protein and urinary albumin were significantly higher in the non-remission group compared to the remission group(6 526.4 vs.3 210.4 mg/g, P=0.002; 3 067.7 vs.2 102.4 mg/g, P=0.007). The remission group had a higher proportion of patients receiving immunosuppressive therapy(85.2% vs.33.3%, P<0.001). The remission rates were higher in patients treated with glucocorticoid combined with cyclophosphamide, glucocorticoid combined with calcineurin inhibitors, or glucocorticoid combined with mycophenolate mofetil compared to those receiving conservative treatment(88.2% vs.31.0%, P=0.001; 80.0% vs.31.0%, P<0.001; 100.0% vs.31.0%, P=0.007). There was no significant difference in remission rate between the three immunosuppressive therapy groups( P>0.05). However, upon further analysis, it was found that the levels of uPCR, uACR, and serum cystatin C(CysC)were higher in the immunosuppressive therapy groups compared to conservative treatment.Additionally, serum total protein and albumin were lower in the immunosuppressive therapy groups, and these differences were statistically significant( P<0.05). Conclusions:The majority of elderly patients diagnosed with IMN have multiple comorbidities.For those at high risk with elevated urinary protein levels, early initiation of immunosuppressive therapy may lead to a higher initial urinary protein remission rate.Therefore, it is advisable to develop individualized treatment plans for elderly patients with IMN based on their clinical characteristics, as well as the risks and benefits associated with immunosuppressive therapy.
6.Effects of Proteasome 20S Subunit Beta 8 on Proliferation,Migration,and Invasion of Clear Cell Renal Cell Carcinoma Cells via Mitogen-Activated Protein Kinase Kinase/Extracellular Signal-Regulated Kinase Signaling Pathway
Yufei HAO ; Yu SHI ; Jinxiu ZHENG ; Xueting ZHAO ; Shenglu LIU ; Lijun YANG
Acta Academiae Medicinae Sinicae 2024;46(5):641-652
Objective To explore the effects of proteasome 20S subunit beta 8(PSMB8)on the prolif-eration,migration,and invasion of clear cell renal cell carcinoma(ccRCC)cells and whether PSMB8 promotes tumor progression by activating the mitogen-activated protein kinase kinase(MEK)/extracellular signal-regula-ted kinase(ERK)signaling pathway.Methods The Cancer Genome Atlas was employed to analyze the mRNA levels of PSMB8 in ccRCC and normal tissue,and the expression levels of PSMB8 in ccRCC tissue and cells were determined by real-time quantitative PCR,Western blotting,and immunohistochemistry.Furthermore,the cell lines with stable overexpression and knockdown of PSMB8 were constructed.The CCK-8 assay and colony forma-tion assay were employed to examine the cell proliferation,and the wound healing assay and Transwell assay were employed to examine the invasion and migration of cells.Kyoto Encyclopedia of Genes and Genomes pathway enrich-ment was performed to analyze the co-expressed genes of PSMB8.Western blotting was used to measure the phospho-rylation levels of the proteins in the MEK/ERK signaling pathway.Finally,the rescue experiment was carried out with the ERK agonist C16-PAF.Results Compared with the normal tissue,the ccRCC tissue showed up-regulated mRNA and protein levels of PSMB8(both P<0.001),which were associated with the TNM stage of patients with ccRCC(P<0.001).Compared with the negative control group,overexpression of PSMB8 promoted the prolifera-tion(P=0.021,P=0.039),migration and invasion(all P<0.001)of 786-O and ACHN cells,and the knock-down of PSMB8 inhibited the proliferation(P=0.022,P=0.005),migration and invasion(all P<0.001)of 786-O and ACHN cells.The pathway enrichment analysis of co-expressed genes of PSMB8 predicted the mitogen-ac-tivated protein kinase signaling pathway(P<0.001).After the knockdown of PSMB8,786-O and ACHN cells showed lowered phosphorylation levels of MEK1/2(P=0.017,P=0.016)and ERK1/2(P=0.010,P=0.040)and down-regulated transcription levels of ERK downstream factors c-Myc(P=0.043,P=0.038),c-Fos(P=0.025,P=0.008),and CyclinD1(P=0.006,P=0.047).Compared with the ERK agonist C16-PAF group,the PSMB8 knockdown+C16-PAF group showed inhibited proliferation(P=0.003,P=0.002),migration and invasion(all P<0.001)of 786-O and ACHN cells.Conclusion PSMB8 may promote the proliferation,migration,and invasion of ccRCC cells by activating the MEK/ERK signaling pathway.
7.Efficacy comparison between sufentanil combined with butorphanol and sufentanil combined with dezocine for postoperative analgesia of single-port thoracoscopic lobectomy
Jing NIU ; Jinxiu KANG ; Na LIU
Cancer Research and Clinic 2024;36(6):454-458
Objective:To investigate the efficacy of sufentanil combined with butorphanol and sufentanil combined with dezocine for postoperative analgesia of single-port thoracoscopic lobectomy.Methods:A prospective randomized controlled study was conducted. A total of 72 patients who underwent single-port thoracoscopic lobectomy in Shanxi Province Cancer Hospital from October to December 2023 were prospectively selected, and the patients were divided into group A and group B according to randomized numerical table method, with 36 cases in each group. Group A used sufentanil combined with dezocine for postoperative analgesia; group B used sufentanil combined with butorphanol for postoperative analgesia. The visual analogue scale (VAS) scores of pain, Ramasy sedation scores, vital signs monitoring indexes, postoperative adverse reactions, and the time of removing the closed chest drain were compared between the two groups at different time points in the postoperative period.Results:There were 20 males (55.6%) and 16 females (44.4%) in group A, aged (58±10) years old; there were 16 males (44.4%) and 20 females (55.6%) in group B, aged (56±11) years old; there were no statistically significant differences between the two groups in terms of gender, age, body mass index, American Society of Anesthesiologists classification, and surgery time (all P > 0.05). Comparison of the VAS scores of the two groups at 2, 6 and 10 h after surgery showed no statistically significant differences (all P > 0.05); the VAS scores of group B at 12, 24 and 48 h were lower than those of group A, and the differences were statistically significant (all P < 0.01). The Ramasy scores of the patients in group B at 2, 6, 10, 12, 24, and 48 h after surgery were higher than those of group A, and the differences were statistically significant (all P < 0.05). The postoperative chest drain removal time in group A was (4.5±1.7) d, which was longer than that in group B [(3.7±0.8) d], and the difference was statistically significant ( t= 2.58, P = 0.014). Comparison of systolic blood pressure, diastolic blood pressure, oxygen saturation, heart rate, and respiration of patients in the two groups at 2, 6, 10, 12, 24, and 48 h after surgery showed no statistically significant differences (all P > 0.05). The incidence of postoperative adverse reactions in patients of both groups was 16.67% (6/36). Conclusions:The efficacy of sufentanil combined with butorphanol for postoperative analgesia of single-port thoracoscopic lobectomy is better than that of sufentanil combined with dezocine, which may help to accelerate the patient's postoperative recovery.Objective To investigate the efficacy of sufentanil combined with butorphanol and sufentanil combined with dezocine for postoperative analgesia of single-port thoracoscopic lobectomy. Methods A prospective randomized controlled study was conducted. A total of 72 patients who underwent single-port thoracoscopic lobectomy in Shanxi Province Cancer Hospital from October to December 2023 were prospectively selected, and the patients were divided into group A and group B according to randomized numerical table method, with 36 cases in each group. Group A used sufentanil combined with dezocine for postoperative analgesia; group B used sufentanil combined with butorphanol for postoperative analgesia. The visual analogue scale (VAS) scores of pain, Ramasy sedation scores, vital signs monitoring indexes, postoperative adverse reactions, and the time of removing the closed chest drain were compared between the two groups at different time points in the postoperative period. Results There were 20 males (55.6%) and 16 females (44.4%) in group A, aged (58±10) years old; there were 16 males (44.4%) and 20 females (55.6%) in group B, aged (56±11) years old; there were no statistically significant differences between the two groups in terms of gender, age, body mass index, American Society of Anesthesiologists classification, and surgery time (all P > 0.05). Comparison of the VAS scores of the two groups at 2, 6 and 10 h after surgery showed no statistically significant differences (all P > 0.05); the VAS scores of group B at 12, 24 and 48 h were lower than those of group A, and the differences were statistically significant (all P < 0.01). The Ramasy scores of the patients in group B at 2, 6, 10, 12, 24, and 48 h after surgery were higher than those of group A, and the differences were statistically significant (all P < 0.05). The postoperative chest drain removal time in group A was (4.5±1.7) d, which was longer than that in group B [(3.7±0.8) d], and the difference was statistically significant ( t= 2.58, P = 0.014). Comparison of systolic blood pressure, diastolic blood pressure, oxygen saturation, heart rate, and respiration of patients in the two groups at 2, 6, 10, 12, 24, and 48 h after surgery showed no statistically significant differences (all P > 0.05). The incidence of postoperative adverse reactions in patients of both groups was 16.67% (6/36). Conclusions The efficacy of sufentanil combined with butorphanol for postoperative analgesia of single-port thoracoscopic lobectomy is better than that of sufentanil combined with dezocine, which may help to accelerate the patient's postoperative recovery.
8.Ferroptosis and its role in gastric and colorectal cancers
Jinxiu HOU ; Bo WANG ; Jing LI ; Wenbo LIU
The Korean Journal of Physiology and Pharmacology 2024;28(3):183-196
Ferroptosis is a novel mechanism of programmed cell death, characterized by intracellular iron overload, intensified lipid peroxidation, and abnormal accumulation of reactive oxygen species, which ultimately resulting in cell membrane impairment and demise. Research has revealed that cancer cells exhibit a greater demand for iron compared to normal cells, indicating a potential susceptibility of cancer cells to ferroptosis. Stomach and colorectal cancers are common gastrointestinal malignancies, and their elevated occurrence and mortality rates render them a global health concern. Despite significant advancements in medical treatments, certain unfavorable consequences and drug resistance persist. Consequently, directing attention towards the phenomenon of ferroptosis in gastric and colorectal cancers holds promise for enhancing therapeutic efficacy. This review aims to elucidate the intricate cellular metabolism associated with ferroptosis, encompassing lipid and amino acid metabolism, as well as iron metabolic processes. Furthermore, the significance of ferroptosis in the context of gastric and colorectal cancer is thoroughly examined and discussed.
9.Herbal Textual Research on Angelicae Pubescentis Radix and Notopterygii Rhizoma et Radix in Famous Classical Formulas
Xiao DU ; Yapeng WANG ; Jinxiu QIAN ; Hongjun YANG ; Huihui LIU ; Zhilai ZHAN
Chinese Journal of Experimental Traditional Medical Formulae 2023;29(5):68-83
By reviewing ancient materia medica, prescription and medical books, combined with modern literature, the paper made textual research on the name, origin, producing area, quality evaluation, harvesting and processing methods of Angelicae Pubescentis Radix and Notopterygii Rhizoma et Radix, so as to provide a basis for the selection and use of these two herbs in the development of famous classical formulas. Through textual research, it can be found that Angelicae Pubescentis Radix and Notopterygii Rhizoma et Radix were mixed together in the early history of China, but the distinction was first made during the Southern and Northern dynasties, and since then there have been constant controversies, and it is not until contemporary times that they are distinguished clearly. In the past dynasties, Duhuo and Qianghuo were used as the rectification of names, some aliases and trade names were also seen. Angelica biserrata is the mainstream origin of Angelicae Pubescentis Radix in the past dynasties, and there are many plants belonging to Angelica, Heracleum and Aralia, which are also used as this medicine. However, the origin of Notopterygii Rhizoma et Radix used in the past dynasties is mostly Notopterygium incisum or N. franchetii, which is relatively uniform. The producing areas of Angelicae Pubescentis Radix and Notopterygii Rhizoma et Radix are mostly concentrated in the western and northwestern regions of China, among which Angelicae Pubescentis Radix is mainly produced in Hubei, Chongqing, Sichuan, Shaanxi and other places, and the border area between Hubei and Chongqing is the geo-authentic area. Notopterygii Rhizoma et Radix is mainly produced in Sichuan, Gansu, Qinghai, Shaanxi and others with the western and northern Sichuan and southern Gansu as the geo-authentic areas. Angelicae Pubescentis Radix and Notopterygii Rhizoma et Radix in the past dynasties were harvested in spring and autumn, especially in February and August of the lunar calendar. Angelicae Pubescentis Radix with strong main roots, few branches, firm texture and strong aroma is superior, and Notopterygii Rhizoma et Radix with strong rhizomes, tightly raised knots, purple-brown skin, tight cross-section, strong aroma and silkworm-like shape is superior. The processing methods of Angelicae Pubescentis Radix and Notopterygii Rhizoma et Radix are mostly cut after cutting the reeds, and the raw product is used as medicine. Based on the above research results, it is recommended that the roots of A. biserrata should be used for Angelicae Pubescentis Radix and the roots of N. incisum should be used for Notopterygii Rhizoma et Radix in the development of famous classical formulas, and raw products should be used in the formulas that do not specify processing requirements.
10.Late-stage cascade of oxidation reactions during the biosynthesis of oxalicine B in Penicillium oxalicum.
Tao ZHANG ; Guowei GU ; Guodong LIU ; Jinhua SU ; Zhilai ZHAN ; Jianyuan ZHAO ; Jinxiu QIAN ; Guowei CAI ; Shan CEN ; Dewu ZHANG ; Liyan YU
Acta Pharmaceutica Sinica B 2023;13(1):256-270
Oxalicine B ( 1) is an α-pyrone meroterpenoid with a unique bispirocyclic ring system derived from Penicillium oxalicum. The biosynthetic pathway of 15-deoxyoxalicine B ( 4) was preliminarily reported in Penicillium canescens, however, the genetic base and biochemical characterization of tailoring reactions for oxalicine B ( 1) has remained enigmatic. In this study, we characterized three oxygenases from the metabolic pathway of oxalicine B ( 1), including a cytochrome P450 hydroxylase OxaL, a hydroxylating Fe(II)/α-KG-dependent dioxygenase OxaK, and a multifunctional cytochrome P450 OxaB. Intriguingly, OxaK can catalyze various multicyclic intermediates or shunt products of oxalicines with impressive substrate promiscuity. OxaB was further proven via biochemical assays to have the ability to convert 15-hydroxdecaturin A ( 3) to 1 with a spiro-lactone core skeleton through oxidative rearrangement. We also solved the mystery of OxaL that controls C-15 hydroxylation. Chemical investigation of the wild-type strain and deletants enabled us to identify 10 metabolites including three new compounds, and the isolated compounds displayed potent anti-influenza A virus bioactivities exhibiting IC50 values in the range of 4.0-19.9 μmol/L. Our studies have allowed us to propose a late-stage biosynthetic pathway for oxalicine B ( 1) and create downstream derivatizations of oxalicines by employing enzymatic strategies.

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