1.Arsenic trioxide preconditioning attenuates hepatic ischemia- reperfusion injury in mice: Role of ERK/AKT and autophagy.
Chaoqun WANG ; Hongjun YU ; Shounan LU ; Shanjia KE ; Yanan XU ; Zhigang FENG ; Baolin QIAN ; Miaoyu BAI ; Bing YIN ; Xinglong LI ; Yongliang HUA ; Zhongyu LI ; Dong CHEN ; Bangliang CHEN ; Yongzhi ZHOU ; Shangha PAN ; Yao FU ; Hongchi JIANG ; Dawei WANG ; Yong MA
Chinese Medical Journal 2025;138(22):2993-3003
BACKGROUND:
Arsenic trioxide (ATO) is indicated as a broad-spectrum medicine for a variety of diseases, including cancer and cardiac disease. While the role of ATO in hepatic ischemia/reperfusion injury (HIRI) has not been reported. Thus, the purpose of this study was to identify the effects of ATO on HIRI.
METHODS:
In the present study, we established a 70% hepatic warm I/R injury and partial hepatectomy (30% resection) animal models in vivo and hepatocytes anoxia/reoxygenation (A/R) models in vitro with ATO pretreatment and further assessed liver function by histopathologic changes, enzyme-linked immunosorbent assay, cell counting kit-8, and terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling (TUNEL) assay. Small interfering RNA (siRNA) for extracellular signal-regulated kinase (ERK) 1/2 was transfected to evaluate the role of ERK1/2 pathway during HIRI, followed by ATO pretreatment. The dynamic process of autophagic flux and numbers of autophagosomes were detected by green fluorescent protein-monomeric red fluorescent protein-LC3 (GFP-mRFP-LC3) staining and transmission electron microscopy.
RESULTS:
A low dose of ATO (0.75 μmol/L in vitro and 1 mg/kg in vivo ) significantly reduced tissue necrosis, inflammatory infiltration, and hepatocyte apoptosis during the process of hepatic I/R. Meanwhile, ATO obviously promoted the ability of cell proliferation and liver regeneration. Mechanistically, in vitro studies have shown that nontoxic concentrations of ATO can activate both ERK and phosphoinositide 3-kinase-serine/threonine kinase (PI3K-AKT) pathways and further induce autophagy. The hepatoprotective mechanism of ATO, at least in part, relies on the effects of ATO on the activation of autophagy, which is ERK-dependent.
CONCLUSION
Low, non-toxic doses of ATO can activate ERK/PI3K-AKT pathways and induce ERK-dependent autophagy in hepatocytes, protecting liver against I/R injury and accelerating hepatocyte regeneration after partial hepatectomy.
Animals
;
Arsenic Trioxide
;
Autophagy/physiology*
;
Reperfusion Injury/prevention & control*
;
Mice
;
Male
;
Proto-Oncogene Proteins c-akt/physiology*
;
Arsenicals/therapeutic use*
;
Oxides/therapeutic use*
;
Liver/metabolism*
;
Extracellular Signal-Regulated MAP Kinases/metabolism*
;
Mice, Inbred C57BL
2.Metabolomics combined with network pharmacology reveals mechanism of Jiaotai Pills in treating depression.
Guo-Liang DAI ; Ze-Yu CHEN ; Yan-Jun WANG ; Xin-Fang BIAN ; Yu-Jie CHEN ; Bing-Ting SUN ; Xiao-Yong WANG ; Wen-Zheng JU
China Journal of Chinese Materia Medica 2025;50(5):1340-1350
This study aims to explore the mechanism of Jiaotai Pills in treating depression based on metabolomics and network pharmacology. The chemical constituents of Jiaotai Pills were identified by UHPLC-Orbitrap Exploris 480, and the targets of Jiaotai Pills and depression were retrieved from online databases. STRING and Cytoscape 3.7.2 were used to construct the protein-protein interaction network of core targets of Jiaotai Pills in treating depression and the "compound-target-pathway" network. DAVID was used for Gene Ontology(GO) function and Kyoto Encyclopedia of Genes and Genomes(KEGG) pathway enrichment analyses of the core targets. The mouse model of depression was established with chronic unpredictable mild stress(CUMS) and treated with different doses of Jiaotai Pills. The behavioral changes and pathological changes in the hippocampus were observed. UHPLC-Orbitrap Exploris 120 was used for metabolic profiling of the serum, from which the differential metabolites and related metabolic pathways were screened. A "metabolite-reaction-enzyme-gene" network was constructed for the integrated analysis of metabolomics and network pharmacology. A total of 34 chemical components of Jiaotai Pills were identified, and 143 core targets of Jiaotai Pills in treating depression were predicted, which were mainly involved in the arginine and proline, sphingolipid, and neurotrophin metabolism signaling pathways. The results of animal experiments showed that Jiaotai Pills alleviated the depression behaviors and pathological changes in the hippocampus of the mouse model of CUMS-induced depression. In addition, Jiaotai Pills reversed the levels of 32 metabolites involved in various pathways such as arginine and proline metabolism, sphingolipid metabolism, and porphyrin metabolism in the serum of model mice. The integrated analysis showed that arginine and proline metabolism, cysteine and methionine metabolism, and porphyrin metabolism might be the key pathways in the treatment of depression with Jiaotai Pills. In conclusion, metabolomics combined with network pharmacology clarifies the antidepressant mechanism of Jiaotai Pills, which may provide a basis for the clinical application of Jiaotai Pills in treating depression.
Animals
;
Drugs, Chinese Herbal/chemistry*
;
Depression/genetics*
;
Mice
;
Network Pharmacology
;
Metabolomics
;
Male
;
Disease Models, Animal
;
Humans
;
Protein Interaction Maps/drug effects*
;
Antidepressive Agents
3.Research progress in mechanisms of kidney-tonifying traditional Chinese medicine in promoting healing of osteoporotic fractures.
Jun WU ; Ou-Ye LI ; Ken QIN ; Xuan WAN ; Wang-Bing XU ; Yong LI ; Jia-Wei ZHONG ; Yong-Xiang YE ; Rui XU
China Journal of Chinese Materia Medica 2025;50(15):4166-4177
Osteoporotic fractures(OPF) refer to the fractures caused by minor violence in the state of osteoporosis, seriously threatening the life and health of elderly patients. Drug and surgical therapies have limitations such as single targets, diverse adverse reactions, and poor prognosis. Kidney-tonifying traditional Chinese medicine(TCM) has good potential in the treatment of OPF. TCM can promote the healing of OPF by promoting angiogenesis in the early stage of bone healing, promoting osteogenic differentiation of bone marrow mesenchymal stem cells in the stage of bone repair, maintaining the balance of osteogenic and osteoclastic system in the stage of bone remodeling, and regulating the oxidative stress responses throughout the process of OPF healing. TCM can alleviate the pathological state of osteoporosis and promote fracture healing in OPF patients via multiple pathways and targets, demonstrating the advantages and potential of biphasic regulation.
Humans
;
Drugs, Chinese Herbal/therapeutic use*
;
Osteoporotic Fractures/metabolism*
;
Animals
;
Fracture Healing/drug effects*
;
Medicine, Chinese Traditional
;
Kidney/metabolism*
;
Osteogenesis/drug effects*
4.Clinical efficacy of open reduction and internal fixation with plates versus minimally invasive Kirschner wire fixation for osteoporotic Colles' fractures.
Jun-Wei ZHANG ; Jin-Yong HOU ; Zhao-Hui LI ; Zhen-Yuan MA ; Xiang GAO ; Hong-Zheng BI ; Ling-Ling CHEN ; Hai-Tao WANG ; Wei-Zhi NIE ; Yong-Zhong CHENG ; Xiao-Bing XI
China Journal of Orthopaedics and Traumatology 2025;38(1):18-24
OBJECTIVE:
To compare the short-term clinical efficacy and safety of closed reduction with Kirschner wire fixation versus open reduction with plate fixation for treating osteoporotic Colles' fractures in middle-aged and elderly patients.
METHODS:
Between January 2018 and January 2023, 119 patients with Colles fractures were retrospectively analyzed, including 39 males and 80 females, aged from 48 to 74 years old with an average of(60.58±6.71) years old. The time from injury to operation ranged 1 to 13 days with an average of (5.29±2.52) days. According to the surgical method, they were divided into Kirschner wire fixation group (Kirschner wire group) and plate internal fixation group (plate group). In Kirschner wire group, there were a total of 68 patients, comprising 21 males and 47 females. The average age was (61.15±6.24) years old, ranged from 49 to 74 years old. Among them, 41 cases involved the left side while 27 cases involved the right side. In the plate group, there were a total of 51 patients, including 18 males and 33 females. The average age was (59.78±5.71) years old ranged from 48 to 72 years old. Among them, there were 31 cases on the left side and 20 cases on the right side. The following parameters were recorded before and after the operation:operation time, intraoperative blood loss, hospitalization days, hospitalization expenses, postoperative complications, and radiographic parameters of distal radius (distal radius height, ulnar deviation angle, palmar tilt angle). The clinical efficacy was evaluated at 3 and 12 months after the operation using Gartland-Werley and disabilites of the arm shoulder and hand (DASH) scores.
RESULTS:
The patients in both groups were followed up for a duration from 12 to 19 months with an average of(13.32±2.02) months. The Kirschner wire group exhibited significantly shorter operation time compared to the plate group 27.91(13.00, 42.00) min vs 67.52(29.72, 105.32) min, Z=-8.74, P=0.00. Intraoperative blood loss was also significantly lower in the Kirschner wire group than in the plate group 3.24(1.08, 5.40) ml vs 21.91(17.38, 26.44) ml, Z=-9.31, P=0.00. Furthermore, patients in the Kirschner wire group had a shorter length of hospital stay compared to those in the plate group (8.38±2.63) days vs (11.40±2.78) days, t=-3.12, P=0.00. Additionally, hospitalization cost was significantly lower in the Kirschner wire group than in the plate group 10 111.29(6 738.98, 13 483.60) yuan vs 15 871.11(11 690.40, 20 051.82) yuan, Z=-5.62, P=0.00. The incidence of complications was 2 cases in the Kirschner wire group and 1 case in the plate group, with no statistically significant difference(P>0.05). At 3 months postoprative, the radial height of the Kirschner wire group was found to be significantly smaller than that of the plate group, with measurements of (11.45±1.69) mm and (12.11±1.78) mm respectively (t=-2.06, P=0.04). However, there were no statistically significant differences observed in ulnar deviation angle and palmar tilt angle between the two groups (P>0.05). The DASH score and Gartland-Werley score in the Kirschner group were significantly higher than those in the plate group at 3 months post-operation (19.10±9.89) vs (13.47±3.51), t=4.34, P=0.00;(11.15±3.61) vs (6.41±2.75), t=8.13, P=0.00). However, there was no significant difference between the two groups at 12 months post-operation (P>0.05).
CONCLUSION
Compared to plate internal fixation, closed reduction with Kirschner wire support fixation yields a slightly inferior recovery of radial height;however, there is no significant disparity in the functional score of the affected limb at 12 months post-operation. Nonetheless, this technique offers advantages such as shorter operation time, reduced intraoperative blood loss, decreased hospitalization duration, and lower cost.
Humans
;
Female
;
Male
;
Middle Aged
;
Aged
;
Fracture Fixation, Internal/instrumentation*
;
Bone Wires
;
Bone Plates
;
Retrospective Studies
;
Colles' Fracture/surgery*
;
Minimally Invasive Surgical Procedures/methods*
;
Open Fracture Reduction/methods*
;
Osteoporotic Fractures/surgery*
5.Clinical correlation study between bone metabolism level and knee osteoarthritis pain.
Yong-Qi SUN ; Ke-Chun GUO ; Ze-Zhong LIU ; Jin-Shuai DUAN ; Bing XU ; Guo-Gang LUO ; Xian-Liang LAI ; Xiao-Feng WANG
China Journal of Orthopaedics and Traumatology 2025;38(5):482-486
OBJECTIVE:
To investigate the variability of bone metabolism levels among different populations and its association with knee osteoarthritis (KOA) pain.
METHODS:
A total of 50 people (control group) who participated in physical examination from January 2023 to June 2023 were selected, including 26 males and 24 females, wtih a mean aged of (52.14±9.04) years old ranging 41 to 65 years old. The other 50 patients with knee osteoarthritis(case group) who attended the outpatient clinic of the Orthopedics and Traumatology Department in the same time period, including 19 males and 31 females, with a mean age of (53.60±7.76) years old ranging 40 to 65 years. The two groups of Western Ontario and McMaster Universities Osteoarthritis Index(WOMAC) and bone metabolism markers, such as 25-hydroxy-cholecalciferol[25(OH)D], β-isomerized typeⅠcollagen C-telopeptide breakdown products (β-CTX), total typeⅠprocollagen N-terminal propeptide (t-PINP), osteocalcin (OC), parathormone (PTH) levels were compared. Pearson correlation analysis was used to compare the correlation between two groups of bone metabolism related markers and WOMAC.
RESULTS:
The WOMAC score of the case group (39.90±2.34) was higher than that of the control group (3.60±0.57), with significant difference (P<0.05). There was no significant difference between the two groups of 25 (OH)D, β-CTX and PTH (P>0.05). The t-PINP and OC of the case group were (62.90±52.40) and (19.88±10.15) ng·ml-1, respectively, and those of the control group were (38.86±10.82) and (14.90±3.62) ng·ml-1, respectively;the t-PINP and OC of the case group were higher than those of the control group, with significant difference (P<0.05). Pearson correlation analysis showed that t-PINP was positively correlated with WOMAC pain score in the case group (r2=0.045, P<0.01).
CONCLUSION
Bone metabolism levels in the serum of patients with knee osteoarthritis are different from those of healthy people, and the difference between OC and t-PINP is the most obvious, and the concentration of t-PINP levels is positively correlated with pain symptoms in patients with KOA. However, the specific mechanism of correlation between the bone metabolism levels of patients with KOA and their pain symptoms needs to be further elucidated by basic experimental research as well as by enlarging the samples.
Humans
;
Female
;
Male
;
Middle Aged
;
Osteoarthritis, Knee/metabolism*
;
Aged
;
Adult
;
Bone and Bones/metabolism*
;
Pain/etiology*
;
Biomarkers/metabolism*
6.Allogeneic hematopoietic stem cell transplantation for pediatric acute leukemia harboring the PICALM-MLLT10 fusion in two cases.
Yu CHEN ; Yong-Bing ZHU ; Jia-Si ZHANG ; Ai ZHANG ; Ya-Qin WANG ; Qun HU ; Ai-Guo LIU
Chinese Journal of Contemporary Pediatrics 2025;27(11):1414-1419
A retrospective analysis was conducted on the clinical course of two children with PICALM-MLLT10-positive acute leukemia treated at Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, between July 2021 and July 2023. The patients were diagnosed with acute T-lymphoblastic leukemia with central nervous system involvement and high-risk acute myeloid leukemia, respectively. Both achieved bone marrow complete remission after conventional chemotherapy combined with venetoclax. Following conversion to molecular negativity, they underwent sequential allogeneic hematopoietic stem cell transplantation. At the latest follow-up, both patients were alive and in good clinical condition. These observations suggest that proceeding to hematopoietic stem cell transplantation after venetoclax-based chemotherapy may improve the long-term survival of children with PICALM-MLLT10-positive leukemia.
Humans
;
Hematopoietic Stem Cell Transplantation
;
Male
;
Female
;
Child, Preschool
;
Transplantation, Homologous
;
Child
;
Leukemia, Myeloid, Acute/genetics*
;
Oncogene Proteins, Fusion/genetics*
7.Retrospective Analysis of Venetoclax Combined with Azacitidine Compared with "3+7" or Similar Regimens for Newly Diagnosed Patients with Acute Myeloid Leukemia.
Lu-Lu WANG ; Juan ZHANG ; Yue ZHANG ; Yong ZHANG ; Xiao-Min DONG ; Dan-Yang ZHANG ; Ting-Ting CHEN ; Yun-Hui ZHOU ; Teng WANG ; Hui-Ling LAN ; He-Bing ZHOU
Journal of Experimental Hematology 2025;33(3):672-681
OBJECTIVE:
To retrospectively analyze the clinical data of newly diagnosed acute myeloid leukemia (AML) patients treated with venetoclax combined with azacitidine (Ven/Aza) or standard "3+7" regimen and similar regimens, collect real-world study data, compare the treatment response and adverse events between the two regimens, as well as perform survival analysis.
METHODS:
To retrospectively analyze the efficacy, survival, and adverse reactions of newly diagnosed AML patients treated with Ven/Aza (24 cases) and "3+7" regimens (117 cases ) in our hospital from September 2009 to March 2023, as well as factors influencing outcomes. A propensity score matching (PSM) was performed on age and Eastern Cooperative Oncology Group performance status (ECOG PS) to obtain a 1:1 matched cohort of 20 pairs, and the efficacy and survival before and after the matching were compared.
RESULTS:
The median age of patients in the Ven/Aza group was 69 years, while that in the "3+7" group was 56 years (P <0.001). Objective remission rate (ORR) was 62.5% in Ven/Aza group and 74.8% in "3+7" group (P >0.05). The median overall survival (OS) in the Ven/Aza group was 522 days, while that in the "3+7" group was 1 002 days (P >0.05). After controlling the two variables of age and ECOG PS, a PSM cohort of 20 pairs was obtained, in which the ORR was 65% in Ven/Aza group and 60% in "3+7" group (P >0.05). The median OS was 522 days and 629 days, and median progression-free survival (PFS) was 531 days and 198 days between the two groups, respectively. There were no statistically significant differences in OS and PFS between the two groups (both P >0.05). Additionally, the incidence of adverse events in the Ven/Aza group was significantly reduced.
CONCLUSION
The overall cohort shows that the "3+7" regimen has advantages in efficacy and survival, but Ven/Aza regimen is relatively safer. After performing PSM on age and ECOG PS, the Ven/Aza group showed improved efficacy, and a longer median PFS compared to "3+7" group.
Humans
;
Leukemia, Myeloid, Acute/drug therapy*
;
Retrospective Studies
;
Sulfonamides/administration & dosage*
;
Azacitidine/administration & dosage*
;
Bridged Bicyclo Compounds, Heterocyclic/administration & dosage*
;
Aged
;
Middle Aged
;
Male
;
Female
;
Antineoplastic Combined Chemotherapy Protocols/therapeutic use*
;
Treatment Outcome
8.Analysis of Positive Results of Anti-M Unexpected Antibody in Pediatric Inpatients in Central China.
Dong-Dong TIAN ; Ding ZHAO ; Wei LI ; Yong-Jun WANG ; Hong-Bing HU ; Yuan-Qing YANG ; Zheng-Feng LI
Journal of Experimental Hematology 2025;33(4):1155-1160
OBJECTIVE:
To analyze the positive rate and distribution of anti-M unexpected antibody in pediatric inpatients aged 0 to 14 years in central China.
METHODS:
A total of 30 049 pediatric inpatients admitted to the Second Xiangya Hospital of Central South University, Wuhan Children's Hospital and Children's Hospital Affiliated of Zhengzhou University from May 2020 to August 2022 were enrolled in this study, and relevant clinical data were collected. Blood samples from the patients were tested for blood typing and screened for unexpected antibodies. For samples that screened positive for unexpected antibodies, identification was conducted using the identification panel to determine the specificity of the antibodies. The distribution and differences of anti-M antibodies in pediatric patients of different sexes, ages, blood groups, disease types, with or without a history of blood transfusion, and across different regions were analyzed.
RESULTS:
Among 30 049 inpatients, the positive rate of unexpected antibodies was 0.91% (273/30 049), of which the positive rate of anti-M antibodies was 0.44% (131/30 049). The positive rate of anti-M antibodies in the neonates aged 0 to < 1 month was 0.10% (5/4 881), and all of them were IgG antibodies from their mothers; The positive rate of anti-M antibodies for the group aged from 1 month to < 1 year old was 0.23% (7/3 108), with no anti-M antibodies detected in patients aged 1-6 months; The positive rates of anti-M antibodies in the 1-4 years old group, 5-9 years old group, and 10-14 years old group were 0.87% (88/10 064), 0.38% (27/7 190), and 0.08% (4/4 806), respectively. The positive rate of anti-M antibodies in the 1-4 years old group was significantly higher than that of the other groups ( P <0.001), and there were also statistical differences in the positive rate between the 5-9 years old group and the 0-< 1 month and 10-14 years old groups ( P <0.001). The prevalences of anti-M antibodies in ABO blood group A, B, O and AB were 0.32% (30/9 482), 0.70% (58/8 293), 0.32% (31/9 595) and 0.45% (12/2 679), respectively. The prevalence of anti-M antibodies in patients with blood group B was significantly higher than that in patients with blood groups A and O ( P <0.05). The prevalences of anti-M antibodies in Hunan, Hubei and Henan was 0.18%, 0.32% and 0.71%, respectively. The prevalence of anti-M antibodies in Henan was significantly higher than that in Hunan and Hubei ( P <0.05), and the distribution showed obvious regional differences between the north and the south. There were no significant differences in the positive rate of anti-M antibodies between the children with different sexes, disease types, and with or without a history of blood transfusion (P >0.05).
CONCLUSION
This study reveals the distribution pattern of anti-M antibodies in pediatric inpatients aged 0-14 years in central China, which has reference value for the research on unexpected red blood cell antibodies in Chinese children.
Humans
;
Child
;
China
;
Infant
;
Child, Preschool
;
Adolescent
;
Female
;
Male
;
Inpatients
;
Infant, Newborn
;
Blood Grouping and Crossmatching
;
Antibodies/blood*
9.Performance assessment of computed tomographic angiography fractional flow reserve using deep learning: SMART trial summary.
Wei ZHANG ; You-Bing YIN ; Zhi-Qiang WANG ; Ying-Xin ZHAO ; Dong-Mei SHI ; Yong-He GUO ; Zhi-Ming ZHOU ; Zhi-Jian WANG ; Shi-Wei YANG ; De-An JIA ; Li-Xia YANG ; Yu-Jie ZHOU
Journal of Geriatric Cardiology 2025;22(9):793-801
BACKGROUND:
Non-invasive computed tomography angiography (CTA)-based fractional flow reserve (CT-FFR) could become a gatekeeper to invasive coronary angiography. Deep learning (DL)-based CT-FFR has shown promise when compared to invasive FFR. To evaluate the performance of a DL-based CT-FFR technique, DeepVessel FFR (DVFFR).
METHODS:
This retrospective study was designed for iScheMia Assessment based on a Retrospective, single-center Trial of CT-FFR (SMART). Patients suspected of stable coronary artery disease (CAD) and undergoing both CTA and invasive FFR examinations were consecutively selected from the Beijing Anzhen Hospital between January 1, 2016 to December 30, 2018. FFR obtained during invasive coronary angiography was used as the reference standard. DVFFR was calculated blindly using a DL-based CT-FFR approach that utilized the complete tree structure of the coronary arteries.
RESULTS:
Three hundred and thirty nine patients (60.5 ±10.0 years and 209 men) and 414 vessels with direct invasive FFR were included in the analysis. At per-vessel level, sensitivity, specificity, accuracy, positive predictive value (PPV) and negative predictive value (NPV) of DVFFR were 94.7%, 88.6%, 90.8%, 82.7%, and 96.7%, respectively. The area under the receiver operating characteristics curve (AUC) was 0.95 for DVFFR and 0.56 for CTA-based assessment with a significant difference (P < 0.0001). At patient level, sensitivity, specificity, accuracy, PPV and NPV of DVFFR were 93.8%, 88.0%, 90.3%, 83.0%, and 95.8%, respectively. The computation for DVFFR was fast with the average time of 22.5 ± 1.9 s.
CONCLUSIONS
The results demonstrate that DVFFR was able to evaluate lesion hemodynamic significance accurately and effectively with improved diagnostic performance over CTA alone. Coronary artery disease (CAD) is a critical disease in which coronary artery luminal narrowing may result in myocardial ischemia. Early and effective assessment of myocardial ischemia is essential for optimal treatment planning so as to improve the quality of life and reduce medical costs.
10.Erratum: Author correction to "Generation of αGal-enhanced bifunctional tumor vaccine" Acta Pharm Sin B 12 (2022) 3177-3186.
Jian HE ; Yu HUO ; Zhikun ZHANG ; Yiqun LUO ; Xiuli LIU ; Qiaoying CHEN ; Pan WU ; Wei SHI ; Tao WU ; Chao TANG ; Huixue WANG ; Lan LI ; Xiyu LIU ; Yong HUANG ; Yongxiang ZHAO ; Lu GAN ; Bing WANG ; Liping ZHONG
Acta Pharmaceutica Sinica B 2025;15(2):1207-1207
[This corrects the article DOI: 10.1016/j.apsb.2022.03.002.].

Result Analysis
Print
Save
E-mail