A high level of high-density lipoprotein cholesterol is a protective factor against transplant renal artery stenosis / 南方医科大学学报

<p><b>OBJECTIVE</b>To investigate the factors associated with the occurrence of transplant renal artery stenosis (TRAS).</p><p><b>METHODS</b>A retrospective analysis was conducted in 26 recipients who developed TRAS and 40 concurrent renal recipients without TRAS. We also conducted a nested case-control study in 14 patients with TRAS (TRAS-SD group) and another 14 non-TRAS recipients who received the allograft from the same donor (non-TRAS-SD group).</p><p><b>RESULTS</b>Compared with those in the concurrent recipients without TRAS, acute rejection (AR) occurred at a significantly higher incidence (P=0.004) and the warm ischemia time (WIT) was significantly longer (P=0.015) and the level of high?density lipoprotein cholesterol (HDL--C) significantly lower (P=0.009) in the recipients with TRAS. Logistic regression analysis suggested that AR (P=0.007) and prolonged WIT (P=0.046) were risk factors of TRAS while HDL-C (P=0.022) was the protective factor against TRAS. In recent years early diagnosis of TRAS had been made in increasing cases, the interval from transplantation to TRAS diagnosis became shortened steadily, and the recipients tended to have higher estimated glomerular filtration rate at the time of TRAS diagnosis.</p><p><b>CONCLUSION</b>Apart from the surgical technique, AR and prolonged WIT are also risk factors of TRAS while a high HDL-C level is the protective factor against TRAS. The improvement of the diagnostic accuracy by ultrasound is the primary factor contributing to the increased rate of early TRAS diagnosis in recent years.</p>

The mechanism and biological function of chemokine receptor CXCR4 and its ligand CXCL12 in hepatocellular carcinoma / 天津医药

Objective To investigate the mechanism and function of chemokine receptor CXCR4 and its ligand CXCL12 (CXCL12 / CXCR4) in primary hepatocellular carcinoma (PHC). Methods Western blot assay, immunohistochemistry and Real-time PCR were used to detect the protein and mRNA expressions of CXCL12/CXCR4 in 60 PHC and corresponding paracancerous tissue samples. Four kinds of hepatoma cells (Huh7, MHCC97h, HepG2 and Hep3B) and normal hepatocytes (7702) were routinely cultured, and then real-time PCR was performed to detect the mRNA expressions of CXCL12/CXCR4 in these cells to screen suitable experimental cells. CXCR4 interference plasmid (sh-CXCR4) and corresponding empty vector (sh-control) were transfected into MHCC97h to construct stable transfected cell lines. The ability of invasion, migration, and proliferation of the 2 groups of cells were detected by Tanswell invasion experiment, cell scratch test and MTT test. The stably expressed sh-control and sh-CXCR4 MHCC97h cells were taken into the subcutaneous of six nude mice, and the growth of the tumor was observed. Western blot assay was used to detect the expressions of vascular endothelial growth factor-C (VEGF-C) in sh-control and sh-CXCR4 MHCC97h cell lines and corresponding xenografts in nude mice, as the same in MHCC97h, which was transfected with CXCR overexpressed plasmid. Results (1) The results of Western blot assay, immunohistochemistry and Real-time PCR showed that the expressions of CXCL12/CXCR4 protein and mRNA were significantly higher in liver cancer tissues than those of paracancerous tissues. (2) The expression levels of CXCL12/CXCR4 mRNA were higher in Huh7, MHCC97h, HepG2 and Hep3B cells than those of 7702 cells. MHCC97h was selected as the experimental cells. The ability of invasion, migration and proliferation of MHCC97h cells transfected with sh-CXCR4 were significantly lower than those of sh-control group. Meanwhile, the growth rate of nude mice transplanted with sh-CXCR4 MHCC97h cells was also significantly lower than that of sh-control group. (3) Both in vitro and in vivo experiments showed that the expression of VEGF-C was lower in sh-CXCR4 group than that in sh-control group, and the expression of VEGF-C was obviously up-regulated after overexpression of CXCR4. Conclusion High expressions of CXCL12/CXCR4 are found in primary cancer tissues and hepatoma cells. CXCL12/CXCR4 may inhibit the proliferation and invasion of hepatoma cells by regulating the expression of VEGF-C protein.

Clinical effect modified Chevron osteotomy combined with lateral tissue loosening in treating mild-moderate hallux valgus through internal signal approach / 中国骨伤

<p><b>OBJECTIVE</b>To explore clinical effect of modified Chevron osteotomy combined with lateral tissue loosening for the treatment of mild-moderate hallux valgus through internal signal approach.</p><p><b>METHODS</b>From July 2015 to June 2016, 26 patients with mild-moderate hallux valgus treated with modified Chevron osteotomy combined with lateral tissue loosening through internal signal approach, including 2 males and 24 females aged from 45 to 65 years old with an average of(54.6±4.8) years old;the courses of diseases ranged from 1 to 5 months with an average of (7.5±3.3) months. Hallux valgus angle(HVA), inter metatarsal angle(IMA) were measured at 12 months after operation, and AOFAS score was applied to evaluate clinical effect before and after operation.</p><p><b>RESULTS</b>All incisions were healed at stage I. No incision occurred infection, metatarsal necrosis and recurrence of hallux valgus deformity. Two patients occurred skin numbness caused by musculocutaneous nerve injury. Twenty-six patients were followed up from 6 to 12 months with an average of(9.12±2.06) months. HVA, IMA were(30.01±3.71)°, (14.00±1.50)° before operation and(9.41±4.16)°, (7.00±0.60)° after operation, which had significant difference. There was statistical significance in AOFAS score before operation 54.77±9.59 and after operation 92.73±5.47, and 19 cases obtained excellent results and 7 moderate.</p><p><b>CONCLUSIONS</b>Modified Chevron osteotomy combined with full thread headless pressure screw fixation and lateral tissue loosening for the treatment of mild-moderate hallux valgus has advantages of excellent exposure, simple operation, stable fixation, rapid recovery. Akin osteotomy with internal capsulorrhaphy were used with lateral loosening and could recover soft tissue balance between lateral and internal, and could receive satisfied clinical effects.</p>

Genotyping of RhD-negative blood samples diagnosed by serological tests from patients waiting for kidney transplantation / 南方医科大学学报

<p><b>OBJECTIVE</b>To compare the accuracy of serological and molecular approaches to identification of RhD-negative patients waiting for kidney transplantation.</p><p><b>METHODS</b>A total of 103 RhD-negative blood samples by serological test were collected from patients waiting for kidney transplantation between January, 2006 and January, 2016. Quantitative PCR and sequencing were used to verify the results of RHD genotyping, and the false negative rates of the serological and molecular methods for RhD genotyping were compared.</p><p><b>RESULTS</b>Among the 103 blood samples, true RhD negativity (with all the 10 exons missing) was found in 56 samples (54.5%), and false RhD negativity (RhD positivity with loss, repetition, or missense mutation in the 10 exons) in 47 samples (45.6%). In the 47 false RhD-negative cases, weak D was detected in 1 case (2.1%), partial D in 13 cases (27.7%), and D-elution in 33 cases (70.2%). The detection rates of RhD negativity differed significantly between the serological and molecular methods (P<0.05).</p><p><b>CONCLUSION</b>Serological test is associated with a high false negative rate in detecting RhD blood group, and the use of the molecular approach has important clinical significance in accurate RhD genotyping for patients waiting for renal transplantation.</p>

Early intervention of BK virus replication promotes stabilization of renal graft function / 南方医科大学学报

<p><b>OBJECTIVE</b>To investigate the optimal time window for intervention of BK virus (BKV) replication and its effect on the outcomes of kidney transplant recipients (KTRs).</p><p><b>METHODS</b>A retrospective analysis of the clinical data and treatment regimens was conducted among KTRs whose urine BKV load was ≥1.0×10copies/mL following the operation between April, 2000 and April, 2015. KTRs with urine BKV load <1.0×10copies/mL matched for transplantation time served as the control group.</p><p><b>RESULTS</b>A total of 54 recipients positive for urine BKV were included in the analysis. According to urine BKV load, the recipients were divided into 3 groups: group A with urine BKV load of 1.0×10-1.0×10copies/mL (n=22), group B with urine BKV load >1.0×10copies/mL (n=24), and group C with plasma BKV load ≥1.0×10copies/mL (n=8); 47 recipients were included in the control group. During the follow-up for 3.2-34.5 months, the urine and plasma BKV load was obviously lowered after intervention in all the 54 BKV-positive recipients (P<0.05). Eighteen (81.82%) of the recipients in group A and 19 (79.17%) in group B showed stable or improved estimated glomerular filtration rate (eGFR) after the intervention; in group C, 4 recipients (50%) showed stable eGFR after the intervention. In the last follow-up, the recipients in groups A and B showed similar eGFR with the control group (P>0.05), but in group C, eGFR was significantly lower than that of the control group (P=0.001). The recipients in group A and the control group had the best allograft outcome with stable or improved eGFR.</p><p><b>CONCLUSION</b>Early intervention of BKV replication (urine BKV load ≥1.0×10copies/mL) in KTRs with appropriate immunosuppression reduction can be helpful for stabilizing the allograft function and improving the long-term outcomes.</p>

Pulmonary fungal infection after renal transplantation: analysis of 40 cases / 南方医科大学学报

<p><b>OBJECTIVE</b>To explore the clinical characteristics, therapeutic measures and risk factors of pulmonary fungal infection in patients after renal transplantation.</p><p><b>METHODS</b>The clinical data of 176 patients receiving renal allograft transplantation with postoperative infections were retrospectively analyzed. Among the patients, 40 were diagnosed to have pulmonary fungal infection, and their clinical symptoms, signs, radiographic findings, pathogenic bacterial culture, histopathological examination, and treatments were analyzed.</p><p><b>RESULTS</b>The 40 recipients with postoperative pulmonary fungal infection included 25 male and 15 female patients with a mean age of 49 years. Twenty-eight of the patients developed pulmonary fungal infection within 6 months after transplantation. Positive pathogen cultivation was reported in 19 cases, and Candida albicans was detected in 11 cases, Candida krusei in 2 cases, Candida glabrata in 3 cases, Candida tropicalis in 1 case, aspergillosis in 1 case, and Candida mycoderma in 1 case. Twenty-four of out of the 40 cases were found to have co-infection. All the patients received antifungal drugs and adjuvant treatments, and 38 patients were cured and 2 died.</p><p><b>CONCLUSION</b>Pulmonary fungal infection often occurs within 6 months after renal transplantation. The most common fungal pathogen is Candida albicans, and the patients often had coinfections. Early diagnosis and timely intervention with antifungal drugs and comprehensive measures are critical in the management of pulmonary fungal infection following renal transplantation.</p>

ROC curve-based evaluation of platelet parameters for predicting delayed renal graft function / 南方医科大学学报

<p><b>OBJECTIVE</b>To investigate the value of evaluating 5 platelet parameters in predicting delayed graft function (DGF) in patients following kidney transplantation.</p><p><b>METHODS</b>We retrospectively analyzed the pre- and postoperative (within 2 months) data of 330 renal transplant recipients. The cases with DGF and those without were analyzed to assess the association between relationship between DGF following transplantation and the variations of blood platelet parameters including platelet count (PLT), large platelet ratio (P-LCR), mean platelet volume (MPV), platelet volume distribution width (PDW) and platelet hematocrit (PCT).</p><p><b>RESULTS</b>The DGF and non-DGF cases were comparable for the platelet parameters before the operation. On postoperative day 7 when the diagnosis of DGF was made, PLT (P<0.05) and PCT (P<0.02) were significantly lower while MPV (P<0.01), PDW (P=0.036) and P-LCR (P=0.01) significantly higher in DGF group than in non-DGF group. The AUCs of P-LCR (0.611±0.047), PDW (0.603±0.048) and MPV (0.762±0.037) were significantly higher than the reference area (P<0.05) with cut-off values of 34.80%, 12.95fl and 11.55fl, respectively. MPV showed a high sensitivity, specificity and Youden index for predicting DFG; PDW and P-LCR had a high sensitivity but a low specificity for predicting DFG with a modest diagnostic value. PLT and PCT, with AUCs of were 0.37 and 0.38, respectively, did not have a predictive value for DGF.</p><p><b>CONCLUSIONS</b>Significant variations in platelet parameters occur in the event of DGF in renal transplant recipients, and monitoring the postoperative changes in MPV, PDW, and P-LCR can help in early diagnosis and treatment of DGF. MPV has a moderate value (0.7-0.9) in predicting DGF, and a MPV>11.55 fl suggests the risk of DGF.</p>

Cloning and sequencing analyses of the complete genome of the provirus of the Inner-Mongolia pandemic strain of the Jaagsiekte sheep retrovirus / 病毒学报

To investigate the kinship between the Inner Mongolia pandemic strain and representative strains of the Jaagsiekte sheep retrovirus (JSRV), total DNA from the lung tissue of a JSRV-infected sheep in Inner Mongolia was used to clone fragments of gag, pro and pol genes. The recombinant plasmid pMD-JSRV (including complete genomic sequence of the JSRV strain isolated from Inner Mongolia) was constructed by linking all the cloned fragments with long terminal repeat (LTR) and env gene fragments (cloned previous and reserved by our research team). Sequence analyses revealed that the genome was 7690 bp in length and contained several typical molecular markers for exogenous form of JSRV. These included the Sca I restriction site in the gag gene, two predicted "CCHC" motifs of zinc finger in the encoded nucleocapsid protein and the predicted "YXXM" motif in the TM region of Env. Homology analyses showed that the virus strain belonged to the JSRV type II. pMD-JSRV and AF105220 strains shared a nucleotide identification of 95%. The full length genomic clone of JSRV could provide a molecular basis for an infectious JSRV molecular clone as well as an experimental platform to study the detection and pathogenesis of JSRV.

Anti-MICA antibodies: risk factors for sensitization and the impact on renal transplantation outcomes / 南方医科大学学报

<p><b>OBJECTIVE</b>To investigate the risk factors for sensitization of anti-MICA antibodies and their impact on the outcomes of renal transplantation.</p><p><b>METHODS</b>Luminex flow cytometry were used to identify 10 MICA antibodies and evaluate the antibody specificity in 98 uremic patients positive or negative for anti-MICA antibodies undergoing kidney transplantation. The factors contributing to MICA sensitization were analyzed, and the incidence of acute rejection and graft function recovery time were compared between the positive and negative cases for anti-MICA antibodies.</p><p><b>RESULTS</b>Of the 98 uremic patients, 16 (16.3%) were positive for anti-MICA antibodies. The positive and negative cases showed significant differences in the history of blood transfusion, pregnancy, transplantation, and PRA status (P<0.05). In the 38 renal transplant recipients, 6 experienced acute graft rejection, which was reversed by methylprednisolone pulse therapy; of the 10 recipients positive for anti-MICA antibodies, 4 showed acute graft rejection as compared to 2 out of the 28 recipients negative for anti-MICA antibodies (P=0.031). The cases positive for anti-MICA antibodies showed a significantly longer graft function recovery time than the negative cases (14.6∓4.7 vs 8.2∓4.5 days, P=0.001).</p><p><b>CONCLUSIONS</b>Blood transfusion, pregnancy, and transplantation all contribute to the production of anti-MICA antibodies. Patients positive for anti-MICA antibodies may require strict HLA matching and more potent immunosuppressive drugs to prevent renal graft rejection and improve graft survival.</p>

Long-term survival of high-risk kidney transplant patients / 中华外科杂志

<p><b>OBJECTIVE</b>To summarize the experiences in high-risk renal transplant recipients for ketter long-term survival.</p><p><b>METHODS</b>From April 1991 to December 2008, a total of 921 kidney recipients with high-risk factors were divided into six groups as following: (1) pediatric patients (< 18 years old) (GI, n = 34); (2) retransplant recipients (GII, n = 169); (3) high sensitized patients (PRA> 30% or peak PRA > 50%)(GIII, n = 35); (4) elderly recipients (> 60 years old) (GIV, n = 297); (5) diabetic patients (GV, n = 112); (6) patients with HBV/HCV infection or HBV/HCV carrier (GVI, n = 274). Each group was compared to a control of 807 recipients without any above risk factor for patient and graft survival at 1, 3 and 5 years. Incidences of acute rejection (AR), chronic rejection (CR) and complication were analyzed and compared respectively between the studied subjects and the control group as well.</p><p><b>RESULTS</b>Compared with the control group, patient/graft survivals were lower in GII, GIII and GVI (all P < 0.05), GIV had worse patient survival (P < 0.05); AR and CR incidences were greater in GI and GIII (all P < 0.05); GIV, GV and GVI had more complications.</p><p><b>CONCLUSIONS</b>This study suggests the benefits for long-term outcome in high-immunological risk renal transplant recipients of low acute selection incidence rate, and reduction of complication incidences is the key to long term results for non-immunological high risk recipients.</p>

KIR/HLA ligand matching and acute rejection after kidney transplantation / 南方医科大学学报

<p><b>OBJECTIVE</b>To explore the effect of KIR/HLA ligand matching which mediates activated or inhibitory signal pathways on acute rejection (AR) after kidney transplantation.</p><p><b>METHODS</b>HLA and KIR genotype assortments were analyzed in 53 donor/recipient pairs of kidney transplantation. The recipients were divided into AR group (GI, n=19) and stable renal function group (GII, n=34) based on the early graft function. The impact of donor HLA, recipient KIR and distinct KIR/HLA class I ligand combinations on acute rejection after kidney transplantation was studied.</p><p><b>RESULTS</b>No significant differences were found in donor HLA-C1/2, HLA-A3, HLA-A11, or HLA-Bw4 between GI and GII groups. The frequency for KIR2DL2/2DS2 and KIR genotype assortment (AA) of the recipients in GI group were significantly lower than that in GII group (26.3% vs 55.9%, P=0.038; 31.6% vs 67.6%, P=0.011). The incidence of AR was significantly lower in donor HLA-C1/1 than in non-C1/1 (31.6% vs 46.7%, P>0.05), and lower in recipient KIR genotype assortment (AA) than in non-AA (20.7% vs 52.2%, P=0.011). A significant higher number of matches for the KIR2DL2/ HLA-C1 and KIR2DL3/HLA-C1 were observed in GII group (P=0.030, P=0.028).</p><p><b>CONCLUSION</b>Distinct KIR/HLA class I ligand combinations between the donor and recipient (such as KIR2DL2/ HLA-C1 and KIR2DL3/HLA-C1) may reduce the incidence of AR. A good KIR/HLA class I ligand matching will benefit the survival of the renal allograft.</p>

Pulmonary infection in kidney transplant and liver transplant recipients / 南方医科大学学报

<p><b>OBJECTIVE</b>To summarize the features of pulmonary infection (PI) in kidney transplant (Ktx) and liver transplant (Ltx) recipients for effective control measures.</p><p><b>METHODS</b>A retrospective analysis was conducted among Ktx recipients and Ltx recipients with PI during the period from Jan 2004 to Dec 2008. The clinical data concerning the infection was compared.</p><p><b>RESULTS</b>Forty-five Ktx recipients and 23 Ltx recipients developed PI after the transplantation. The incidence of PI was 7.4% and 56.1% in (P<0.001), respectively, with severe PI occurring in 2.6% and 46.3% of the recipients (P<0.001). The median time from PI diagnosis to transplant was 230 days (29-1080 days) and 4 days (2-104 days) (P<0.001), the case-fatality rate for PI was 6.7% and 17.4% (P=NS), and the mortality rate was 0.5% and 9.8% (P<0.001) in Ktx and Ltx recipients, respectively; Gram-negative organisms were the most common in both Ktx and Ltx recipients, but Ltx recipients had significantly higher incidence of multidrug-resistant bacteria (12.9% vs 37.0%, P=0.005).</p><p><b>CONCLUSION</b>The knowledge of PI after the transplantation will benefit appropriate prophylactic and empirical treatment to improve the survival of Ktx and Ltx recipients.</p>

The expression of galectin-3 and osteopontin in occult metastasis of non-small cell lung cancer / 中华外科杂志

<p><b>OBJECTIVE</b>To study the relationship between expression of galectin-3 (Gal-3) and osteopontin (OPN) in occult metastasis in non-small cell lung cancer.</p><p><b>METHODS</b>Forty-six patients of non-small cell lung cancer (NSCLC) from January 2006 to October 2007 were selected. There were 28 males and 18 females, aged from 33 to 77 years old. The levels of lung tissues Gal-3 and OPN were detected by RT-PCR, and the levels of blood plasma's were measured by ELISA.</p><p><b>RESULTS</b>There were 12 patients who had metastasized. In un-metastasis group the Gal-3 and OPN mRNA expression levels were significantly lower than that in metastasis group: mean value were 0.07 +/- 0.17 and 0.17 +/- 0.25 in un-metastasis group, while 0.73 +/- 0.23 and 0.79 +/- 0.24 in metastasis group. Blood plasma levels of Gal-3 (18.8 +/- 7.9) microg/L and OPN (153.5 +/- 63.5) microg/L in NSCLC which were detected from metastasis group were higher than un-metastasis group of (9.2 +/- 5.6) microg/L and (89.2 +/- 24.0) microg/L.</p><p><b>CONCLUSIONS</b>High serum levels of Gal-3 and OPN and high expression of Gal-3 and OPN mRNA in NSCLC are closely related to the occurrence and metastasis of NSCLC. They may be indexes of evaluating the occult metastasis in NSCLC.</p>

Simultaneous liver-kidney transplantation in polycystic kidney and hepatic disease with kidney and liver failure / 中华外科杂志

<p><b>OBJECTIVE</b>To review the clinical experiences concerning simultaneous liver-kidney transplantation in polycystic kidney and hepatic disease with kidney and liver failure.</p><p><b>METHODS</b>This study involved 8 cases of simultaneous liver-kidney transplantation in polycystic kidney and hepatic disease with kidney and liver failure. There were 5 male and 3 female patients, aged from 41 to 67 years old with a mean of 52.8 years old. Six cases transplanted kidney after liver with orthotopic liver transplantation, and 2 cases transplanted liver after kidney with piggy-back liver transplantation. The acute rejections, complications, liver function, kidney functions, and survival rates of patient/liver/kidney were recorded.</p><p><b>RESULTS</b>Within the follow-up of 28 to 65 months, all 8 patients are still alive with normal liver and kidney functions: 2 living more than 5 years, 2 living more than 4 years and 4 living more than 2 years. 2 cases of pleural effusion and 1 case of pneumonia were complications after operation, which had been cured successfully. No acute rejection of allograft was observed.</p><p><b>CONCLUSIONS</b>Simultaneous liver-kidney transplantation is a safe and effective treatment for polycystic kidney and hepatic disease with kidney and liver failure.</p>

Comparison of the surgical approaches for nephrectomy in living related donors / 南方医科大学学报

<p><b>OBJECTIVE</b>To compare the clinical effects and graft outcomes of 4 surgical approaches for nephrectomy in living related kidney donors.</p><p><b>METHODS</b>Between June, 2004 and June, 2007, 119 living related kidney donors underwent nephrectomy via different surgical approaches, and their clinical data were retrospectively analyzed. Of these donors, 22 received retroperitoneal open nephrectomy, 21 had retroperitoneoscopic nephrectomy, 13 had hand-assisted laparoscopic nephrectomy, and 63 underwent transperitoneal open nephrectomy. The operating time, warm ischemia time of the graft, renal graft artery and vein lengths, reduction rate of recipient serum creatinine in the first 3 days after renal transplantation, mean hospital stay and complications of the donors were compared between the 4 surgical approaches.</p><p><b>RESULTS</b>Open surgeries were associated with significantly shorter operating time (P=0.0033) and warm ischemia time of the graft (P=0.0001), longer hospital stay (P=0.0000), higher hospital expenses (P=0.0000), faster postoperative reduction of recipient serum creatinine (P=0.0001), and longer renal artery and vein lengths (P=0.0000 on the left and P=0.0001 on the right) than laparoscopic surgeries. In the laparoscopic surgery group, subcutaneous emphysema occurred in 1 case, DGF in 2 cases, and lumbar vein hemorrhage in 2 cases for which open surgery was performed. In the open surgery group, only one case required reoperation due to adrenal gland hemorrhage. All the kidney grafts were successfully harvested without other complications observed in the donors.</p><p><b>CONCLUSIONS</b>Both open and laparoscopic surgeries are safe for nephrectomy in living related kidney donors, and the selection of the surgical approaches depends on the kidney and donor conditions and the surgical proficiency of the surgeons.</p>

Causes and therapeutic principles of pulmonary infections in renal transplant recipients / 中国医学科学院学报

Pulmonary infection after renal transplantation is a well recognized and prevalent postoperative complication, which can occur at either the early stage or late stage after transplantation. The etiology and this phenomenon and its impacts remains unclear. It may be life-threatening in severe patients. Early diagnosis and treatment are important; meanwhile, the dosage of immunosuppressant should be minimized. Prophylactic management should also be emphasized.

Multivariate analysis of the risk factors of cytomegalovirus pneumonia after renal transplantation / 南方医科大学学报

<p><b>OBJECTIVE</b>To identify the risk factors for cytomegalovirus (CMV) pneumonia after renal transplantation and investigate the early precaution measures.</p><p><b>METHODS</b>A retrospective study was conducted in a group of 28 patients undergoing renal transplantation who were readmitted because of CMV pneumonia between Jan, 2005 and Dec, 2007. Chi-square test and multivariate logistic regression were used to identity the significant risk factors.</p><p><b>RESULTS</b>Seven factors, namely recipient age, acute graft rejection, pre-transplantation dialysis, delayed graft function recovery, recipient peak PRA level, donor CMV positivity and the use of MMF were found to significantly correlate to post-transplant CMV pneumonia. Multivariate logistic regression further confirmed that donor CMV IgG positivity, acute graft rejection and pre-transplantation dialysis for over 6 months were independent factors to predict the occurrence of CMV pneumonia.</p><p><b>CONCLUSIONS</b>Acute graft rejection control, appropriate donor selection and shortened dialysis before the transplantation can be crucial factors to reduce the incidence of CMV pneumonia after renal transplantation.</p>

Analysis of natural killer cell immunoglobulin-like receptor genes in Chinese / 南方医科大学学报

<p><b>OBJECTIVE</b>To investigate the genotypes of natural killer cell immunoglobulin-like receptor (KIR) genes and their frequencies in Chinese subjects and explore the mechanism of the actions of nature killer cells.</p><p><b>METHODS</b>The DNA samples were obtained from 67 randomly selected unrelated Chinese Han individuals for genotyping of the KIR genes using PCR with sequence-specific primers (PCR-SSP), and the frequencies of the KIR genes in these Chinese subjects were compared with the reported frequencies in populations of other nationalities.</p><p><b>RESULTS</b>Sixteen KIR genes were identified in these Chinese subjects, and 87.5% of these genes were expressed at frequencies above 0.35. Fourteen functional KIR genes combined into 25 KIR genotypes, among which the most frequent genotype KIR-2DL1-2DL3-2DL4-3DL1-3DL2-3DL3-2DS4 showed a frequency of 0.373, while the frequencies of all the other genotypes were no greater than 0.09. Comparison of the KIR combinations in Chinese Han population with those of Japanese, Korean, and Caucasians populations identified 8.93% of the KIR combinations shared by all these populations; the Chinese, Koreans and Caucasians shared 5.36% common KIR combinations, whereas only 1.79% common combinations were found in Chinese and Caucasians. In this study, 16 new gene combinations were identified (25.28%).</p><p><b>CONCLUSION</b>This study shows the high-frequency distribution of a single KIR gene polymorphism. The KIR combination KIR-2DL1-2DL3-2DL4-3DL1-3DL2-3DL3-2DS4 has the highest frequency in Chinese, Japanese, Korean and Caucasian populations, indicating that inhibitory signal transduction pathway plays an important role in the function of the natural killer cells. This study provide clues for new approaches for improving the prognosis of kidney transplantation by enhancing or inhibiting the function of the natural killer cells instead of life-time usage of immunosuppressive agents.</p>

Expression of Notch1 on peripheral lymphocytes before and after acute graft rejection following renal transplantation / 南方医科大学学报

<p><b>OBJECTIVE</b>To study the changes in Notch1 expression on peripheral lymphocytes after acute graft rejection after renal transplantation.</p><p><b>METHODS</b>Twenty renal transplant recipients experiencing acute graft rejection and 20 without acute rejection were enrolled in this study. Flow cytometry was used to detect the expression of Notch1 on peripheral lymphocytes of the patients before operation, at the occurrence of acute rejection and after anti-rejection therapy. The rates of Notch1-positive lymphocytes measured at different time points were compared between the two groups.</p><p><b>RESULT</b>In patients with acute graft rejection, Notch1 expression at the time of rejection onset was significantly higher than that before operation (t=4.245, P=0.000) and that of patients with graft rejection (t=3.839, P=0.000), and was obviously decreased after anti-rejection therapy (t=3.102, P=0.004). Patients without graft rejection showed no significant changes in Notch1 expression after the transplantation (P=0.409). Notch1 expression was comparable between the recipients receiving Tac therapy and those with CsA therapy (P>0.05).</p><p><b>CONCLUSION</b>Monitoring Notch1 expression on the peripheral lymphocytes after renal transplantation may help in the diagnosis of acute graft rejection and prediction of the effect of an anti-rejection therapy.</p>

Expression of major histocompatibility complex class I-related chain A antibody in patients with end-stage renal disease and its clinical implications / 南方医科大学学报

<p><b>OBJECTIVE</b>To study the frequency of major histocompatibility complex class I-related chain A (MICA) antibody in patients with end-stage renal disease (ESRD).</p><p><b>METHODS</b>Luminex flow cytometry and beads loaded with 11 MICA antigens were used to identify the MICA antibody and evaluate the antibody specificity in 110 patients with ESRD.</p><p><b>RESULTS</b>The positivity rate of MICA antibody was 40% (12/30) in PRA-positive patients, significantly higher than the rate of 17.5% (14/80) in PRA-negative patients (chi(2)=6.120, P=0.013). MICA-specific antibodies against 10 of the 11 MICA antigens were detected in 26 MICA antibody-positive patients, and 26.92% of the MICA antibody-positive patients had antibodies with single-specificity and 73.08% had polyspecific antibodies. Three MICA antibody-positive patients with cadaveric kidney transplantation showed good function of the graft without acute rejection 2 months after the operation.</p><p><b>CONCLUSION</b>The positivity rate of MICA antibody is significantly higher in PRA-positive patients, suggesting a strong correlation between MICA and PRA positivity. The MICA antibodies are polyspecific and probably consist of IgM and IgG. These data can be used as prospective data for these ESRD patients considering potential renal transplantation, and may facilitate further investigation of the association of MICA with renal transplantation.</p>