The value of synthetic MRI in identifying different molecular types of breast cancer and triple negative and non triple negative breast cancer / 中华放射学杂志

Objective:To investigate the value of synthetic MRI quantitative parameters in identifying different molecular types of breast cancer and triple negative breast cancer (TNBC) and non-TNBC.Methods:A retrospective analysis was performed on 208 patients diagnosed with invasive ductal breast cancer in the First Affiliated Hospital of China Medical University from March 2019 to September 2020. All patients underwent synthetic MR examinations and the following quantitative parameters were measured, including tumor diameter, volume, apparent diffusion coefficient (ADC), and corresponding values of T 1, T 2, and proton density (PD). According to the immunohistochemical results, there were 122 cases of progesterone receptor (PR) positive and 86 cases of PR negative, 123 cases of estrogen receptor (ER) positive and 85 cases of ER negative, 79 cases of human epidermal growth factor receptor-2 (HER2) positive and 129 cases of HER2 negative, 149 cases of Ki-67 high expression and 59 cases of Ki-67 low expression; there were 36 cases of TNBC and 172 cases of non-TNBC. Independent samples t test or Mann-Whitney U test were used to compare the quantitative parameters of different molecular types, TNBC and non-TNBC patients. Multivariate logistic regression was used to analyze independent predictors of TNBC, and receiver operating characteristic curve and area under the curve (AUC) were used to evaluate the efficacy of sole and combined parameters in identifying TNBC. Results:T 1 and T 2 values in PR negative breast cancer patients were higher than those in PR positive patients ( t=2.30, Z=2.04, P<0.05); the values of T 1 and T 2 in ER negative patients were higher than those in ER positive patients ( t=2.52, Z=2.48, P<0.05); ADC value and tumor diameter of HER2 positive patients were larger than those in HER2 negative patients ( t=-3.21, Z=-3.22, P<0.05). T 2 value, tumor volume and diameter in patients with Ki-67 high expression were significantly higher than those in patients with Ki-67 low expression ( Z=-3.47, -2.51, -2.84, P<0.05); ADC value in Ki-67 high expression group was less than that in Ki-67 low expression group ( t=3.94, P<0.001). T 1, T 2 values and tumor volume in TNBC patients were higher than those in non-TNBC patients ( t=-3.26, Z=-5.58, Z=-2.02, P<0.05], and ADC value in TNBC patients was lower than that in non-TNBC patients ( t=3.07, P=0.002). Multivariate logistic regression analysis showed that T 2 (OR=1.060, 95%CI 1.028-1.093, P<0.001) and ADC value (OR=0.947, 95%CI 0.911-0.984, P=0.005) were independent predictors of TNBC. The efficacy of each parameter alone and in combination to identify TNBC showed that the T 2 value in the single parameter had the largest AUC (0.759), and there was no significant difference between T 2 value and its combined parameters in the diagnosis of TNBC. Conclusions:The quantitative parameters based on synthetic MRI, especially T 2 value, have value in differentiating different molecular types of breast cancer, TNBC and non-TNBC may be another non-contrast parameter for evaluating tumor aggressiveness beyond ADC value.

Clinical study on the application of covered vacuum sealing drainage technology to the bite of venomous snakes of Trimeresurus stejnegeri in Guangxi / 中华危重病急救医学

Objective:To established the diagnostic criteria for venomous snakebite of Trimeresurus stejnegeri in Guangxi by ourselves, and explore the clinical effect and mechanism of covered vacuum sealing drainage (VSD) in the treatment for venomous snakebite of Trimeresurus stejnegeri in Guangxi.Methods:According to the Chinese emergency medicine for snakebite and the Chinese snake, the diagnostic criteria for venomous snakebite of Trimeresurus stejnegeri in Guangxi were formulated: ① the responsible venomous snake was identified as Trimeresurus stejnegeri in Guangxi; ② the appearance and morphology of the venomous snake described by the patient basically conformed to the characteristics of Trimeresurus stejnegeri in Guangxi;③ clinical manifestations of hematotoxin included local swelling, severe wound pain, and subcutaneous ecchymosis in some patients; having① or both ② and ③ could be diagnosed. The patients with venomous snakebite of Trimeresurus stejnegeri in Guangxi admitted to Snake Injury Treatment Base in Central and Northern Guangxi/Liuzhou Integrated Chinese and Western Medicine Snake Injury Treatment Center from January 2016 to January 2020 were enrolled. The patients were divided into the general treatment group and the covered VSD technology group, with 60 patients in each group. The general treatment group was treated with antivenom, anti-tetanus, closed injection around the wound, anti-inflammatory, magnesium sulfate gauze applied on the affected limb, symptomatic support treatment. The covered VSD technique was used in the covered VSD technology group based on the treatment options of the general treatment group. Treatment cycle of both groups were calculated from the next day of admission and lasted for 7 days. In the treatment cycle, blood was collected at 08:00 every day. The red blood cell count (RBC) and hemoglobin (Hb) were detected by automatic blood cell analyzer. The prothrombin time (PT), activated partial thromboplastin time (APTT) and fibrinogen (Fib) were detected by automatic blood coagulation analyzer, and the affected limb swelling degree and the appearance of subcutaneous ecchymosis were recorded. Results:At different time points in the treatment cycle, the dynamic change trends of PT, APTT and Fib in the covered VSD technology group and the general treatment group were significantly different. Fib in both groups decreased on the 1-4 days, and gradually rose on the 5th day, and the lowest Fib value in the covered VSD technology group on the 4th day was higher than that in the general treatment group (g/L: 0.70±0.03 vs. 0.41±0.01, P < 0.05). In the treatment cycle, PT of both groups increased in the early and middle stage, but decreased in the later stage. The peak value of PT of the covered VSD technology group on the 5th day was significantly lower than that of the general treatment group (s: 25.2±0.1 vs. 35.4±0.2, P < 0.05), and the PT of the covered VSD technology group returned to the normal range on the 7th day, while the PT of the general treatment group was still abnormal. APTT in both groups increased at the beginning of the treatment cycle and gradually decreased. The peak value of APTT of the covered VSD technology group on the 3th day was lower than that in the general treatment group (s: 47.3±0.1 vs. 55.7±0.2, P < 0.05), and the rate of increase and decline was also more gradual than that in the general treatment group. There was no significant difference in RBC or Hb between the two groups. With the passage of time, the degree of affected limb swelling was relieved to different degrees in both groups, and the remission degree in the covered VSD technology group was more obvious than that in the general treatment group, and there was significant difference between the two groups (χ 2 = 86.060, P = 0.000). The occurrence rate of subcutaneous ecchymosis in the covered VSD technology group was significantly lower than that in the general treatment group (13.3% vs. 40.0%, χ 2 = 10.909, P = 0.002). Conclusions:The application of covered VSD technology to the venomous snakebite of Trimeresurus stejnegeri in Guangxi does not aggravate the bleeding. It is beneficial to the reduction of the swelling of the affected limb, and also promotes the recovery of coagulation function, which can better control the occurrence of adverse events caused by coagulation dysfunction.

A new method measuring the rotation center of hip joint and its significance for hip replacement surgery / 中国医师杂志

Objective To design and evaluate a new method for measuring the center of rotation of the hip joint,and to compare it with the traditional methods.Methods Data of healthy hips of 120 total hip arthroplasty (THA) patients (120 hips) and bilateral hips of 20 healthy volumteers (40 hips) were collected.A series of X-rays and magnetic resonance imaging (MRI) were taken from each patient with the hip joint abductted at differenct angles (0°,7.5°,15°,and 22.5°).The motion track of rotation center was obtained by comparing these X-ray and MRI images.The preoperative and postoperative data of 67 surgical patients who underwent two different measurement methods before surgery were compared.Results Compared with traditional measurement methods,the accuracy of our new method was significantly improved;the results of hip MRI verified the objectivity and accuracy of our new method;preoperative measurements and postoperative follow-up results showed that our new method had a better clinical effect than traditional measurements.Conclnsions The team's innovative new measurement method based on pelvic orthotopic X-ray photographs with different abduction angles of the hip shows more accurate data than traditional measurement methods and shows better clinical results.

Application of closed negative pressure irrigation and suction device in the treatment of high perianal abscess / 中华胃肠外科杂志

Objective@#To explore the efficacy of closed negative pressure irrigation and suction device (Patent number: Z200780013509.8) in the treatment of high perianal abscess.@*Methods@#From January 2015 to December 2016, ≥18-year-old patients with primary high perianal abscess who were treated at our department were prospectively enrolled. Exclusion criteria: (1) recurrent perianal abscess; (2) complicated with anal fistula formation; (3) preoperative, intraoperative or postoperative physical therapy, and curettage treatment, negative pressure irrigation; (4) Crohn′s disease-related perianal abscess; (5) with immunosuppressive status, such as transplant recipients; (6) co-existence of malignant tumors, such as leukemia; (7) with diabetes; (8) those who could not receive long-term follow-up and were not suitable to participate in this study. According to the random number table method, the patients were randomly divided into negative pressure irrigation and suction group and routine drainage group. All patients were clearly diagnosed and the location and size of the perianal abscess were marked before surgery. These two groups were treated as follows: (1) Negative pressure irrigation and suction group: the skin was incised at a diameter of 1-2 cm at the site where the abscess fluctuated most obviously. After the abscess was removed, a closed negative pressure irrigation and suction device was installed and the pressure of -200 to -100 mmHg (1 mmHg=0.133 kPa) was maintained to keep the abscess cavity collapsed. Generally, the irrigation was stopped 5 days later or when the drainage was clear. The closed vacuum suction was maintained for 2 additional days, before the wound was sutured. (2) Conventional drainage group: conventional incision and drainage was carried out. The skin was cut at a diameter of 8 to 10 cm at the site of abscess with most obvious fluctuation. After the abscess was removed, normal saline gauze was used for dressing. Dressing was changed regularly until the wound healed. The efficacy, operative time, intraoperative bleeding, incision length, frequency of dressing change, pain index (visual analogue score, VAS score), postoperative healing time, complications, recurrence rate of perianal abscess, anal fistula formation rate were observed. The t test and χ2 test were used for comparison between the 2 groups.@*Results@#There were both 40 patients in the negative pressure irrigation and suction group and the conventional drainage group. There were 28 males and 12 females in negative pressure irrigation and suction group with a mean age of (38.3±12.0) years and mean disease course of (6.6±2.1) days. The abscess in pelvic-rectal space accounted for 50.0% (20/40) and the mean diameter of abscess was (8.0±3.7) cm. There were 26 males and 14 females in the conventional drainage group with a mean age of (37.1±11.8) years and mean disease course of (6.4±2.5) days. The abscess in pelvic-rectal space accounted for 55.0% (22/40) and the diameter of abscess was (8.2±3.5) cm. The differences in baseline data between two groups were not statistically significant (all P>0.05). Both groups successfully completed the operation. There was no significant difference in operative time between two groups (P>0.05). As compared to conventional drainage group, intraoperative blood loss in negative pressure irrigation and suction group was less [(12.1±5.5) ml vs. (18.3±4.4) ml, t=5.606, P<0.001], incision length was shorter [(2.3±0.8) cm vs. (7.6±1.7) cm, t=17.741, P<0.001], postoperative VAS pain scores at 1-, 3-, 7-, and 14-day after operation were lower [3.7±1.4 vs. 7.6±1.8, t=10.816, P<0.001; 3.0±1.3 vs. 6.8±1.6, t=11.657, P<0.001; 2.7±0.9 vs. 5.1±1.1, t=10.679, P<0.001; 1.2±0.3 vs. 1.6±0.4, t=5.060, P=0.019], the dressing change within 7 days after operation was less (3.5±1.2 vs. 12.6±2.7, t=19.478, P<0.001), postoperative healing time was shorter [(10.4±3.0) d vs. (13.5±3.8) d, t=4.049, P<0.001] and postoperative complication rate was lower [17.5% (7/40) vs. 2.5% (1/40), χ2=5.000, P=0.025]. During follow-up of 12 to 36 (24±5) months, the recurrence rate of perianal abscess within 1 year after operation and anal fistula formation rate in negative pressure irrigation and suction group were lower than those in conventional drainage group [5.0% (2/40) vs. 20.0% (8/40), χ2=4.114, P=0.042 and 2.5% (1/40) vs. 17.5% (7/40), χ2=5.000, P=0.025, respectirely]. The one-time cure rate of negative pressure irrigation and suction group and conventional drainage group was 92.5% (37/40) and 62.5%(25/40), respectirely (χ2=10.323, P=0.001).@*Conclusions@#The application of the negative pressure irrigation and suction device in the treatment of high perianal abscess can improve the efficiency of one-time cure, reduce postoperative pain, accelerate healing time, decrease the morbidity of postoperative complication and the rates of abscess recurrence and anal fistula formation, indicating an improvement of the treatment.

A new method measuring the rotation center of hip joint and its significance for hip replacement surgery / 中国医师杂志

Objective@#To design and evaluate a new method for measuring the center of rotation of the hip joint, and to compare it with the traditional methods.@*Methods@#Data of healthy hips of 120 total hip arthroplasty (THA) patients (120 hips) and bilateral hips of 20 healthy volumteers (40 hips) were collected. A series of X-rays and magnetic resonance imaging (MRI) were taken from each patient with the hip joint abductted at differenct angles (0°, 7.5°, 15°, and 22.5°). The motion track of rotation center was obtained by comparing these X-ray and MRI images. The preoperative and postoperative data of 67 surgical patients who underwent two different measurement methods before surgery were compared.@*Results@#Compared with traditional measurement methods, the accuracy of our new method was significantly improved; the results of hip MRI verified the objectivity and accuracy of our new method; preoperative measurements and postoperative follow-up results showed that our new method had a better clinical effect than traditional measurements.@*Conclusions@#The team′s innovative new measurement method based on pelvic orthotopic X-ray photographs with different abduction angles of the hip shows more accurate data than traditional measurement methods and shows better clinical results.

Inhibitory role of epigallocatechin-3-gallate in proliferation of human na-sopharyngeal carcinoma cells by targeting P53/miR-34a / 中国病理生理杂志

AIM:To study the effect of epigallocatechin-3-gallate (EGCG) on the proliferation of human naso-pharyngeal carcinoma ( NPC) cells, and to explore its mechanism by targeting miR-34a.METHODS: Nasopharyngeal carcinoma CNE-2Z cells were treated with various concentrations of EGCG .The ability of cell proliferation was detected by CCK-8 assay, 5-ethynyl-2-deoxyuridine (EdU) incorporation assay and colony-forming assay.The cell cycle distributions were analyzed by flow cytometry .The protein levels of P53 and Notch1 were detected by Western blot .The expression of miR-34a and Notch1 mRNA was measured by real-time PCR.RESULTS:EGCG effectively inhibited the proliferation and colony formation of CNE-2Z cells in a dose-dependent manner , which was related to its induction of cell cycle arrest at G 0/G1 phase.The expression of P53 and miR-34a in CNE-2Z cells was significantly increased after treated with EGCG , while the expression of Notch1 at mRNA and protein levels was markedly suppressed .CONCLUSION:EGCG induces cell cycle arrest and suppresses cell proliferation by regulating the P 53/miR-34a/Notch1 pathway in NPC cells.

Autogenous tendon transplantation for repair of grade III medial collateral ligament injury / 中国组织工程研究

BACKGROUND:Young patients with cruciate ligament injury and high activity levels are prone to grade III medial colateral ligament injury in knee joint. Conventional construction methods such as direct restoration of injured ligaments and muscle-tendon transposition may induce the loosening of medial colateral ligament complex. OBJECTIVE:To explore the clinical effect of autologous tendon transplantation for grade III medial colateral ligament injury of the knee joint. METHODS: Forty-seven patients with grade III medial colateral ligament rupture were treated by operative repair and reconstruction. After repairing the anatomical structure of medial colateral ligaments, we liberated organic semitendinous tendon, bone-patela tendon-bone, and hamstring tendon, to reconstruct superficial medial colateral ligament. RESULTS AND CONCLUSION:Thirty-seven patients were folowed up for 48 months. Preoperative Lysholm score, IKDC score, Tegner score at the final folow-up, and the widened medial joint space on valgus stress X-Ray films were significantly improved compared with before reconstruction (P < 0.05). According to clinical efficacy scores, 12 cases achieved excelent reconstruction, 18 cases achieved good reconstruction, 4 cases achieved moderate reconstruction, and 3 cases achieved poor reconstruction. The excelent and good rate was 82%. Medial colateral ligament reconstruction based on repairing the anatomical structure is effective and satisfactory. Autologous bone-patela tendon-bone or semitendinous tendon is a good choice for medial colateral ligament reconstruction.

Curative effect of arthroscopic suture anchor fixation on shoulder bankart injury / 中南大学学报(医学版)

OBJECTIVE@#To determine the curative effect of arthroscopic suture anchor fixation on shoulder bankart injury.@*METHODS@#Sixteen patients with shoulder recurrent dislocation and diagnosed bankart injury were treated with suture anchor fixed by shoulder arthroscopy. Both shoulders of the patients had X-ray, MRI, physical examination before the operation. Suture anchors were used to fix the lesion labrum by shoulder arthroscopy. University of California at Los Angeles (UCLA) score and visual analogue scale (VAS) score were adopted for the final evaluation at the latest follow-up.@*RESULTS@#All patients were followed for a period of 25 (7-68) months. At the latest follow-up, no redislocation and instability occured. The pre- and post-operation UCLA score was (20.8 ± 0.8) vs (32.9 ± 1.5), excellent in 6, good in 10, with no poor score, while the pre- and post-operation VAS score was (3.3 ± 0.8) vs (0.6 ± 0.5).@*CONCLUSION@#Suture anchor fixation guided by arthroscopy is good for bankart injury caused by recurrent shoulder dislocation, which has many advantages, such as mini-invasion, rapid recovery and a satisfactory outcome in function and motion.

Integration of sperm motility and chemotaxis screening with a microchannel-based device / 中华检验医学杂志

Objective Sperm screening is an essential step in IVF procedures. The swim-up method, an assay on sperm motility, is used clinically to select the ideal sperm for subsequent manipulation. However, additional parameters, including acrosome reaction capability, chemotaxis, and thermotaxis are also important indicators of mammalian sperm health. To monitor both sperm motility and chemotaxis simultaneously during sperm screening, we designed and constructed a microdevice comprising a straight channel connected with a bi-branch channel that mimics the mammalian female reproductive tract. Methods The width and length of the straight channel were optimized to select the motile sperm. Cumulus cells were selectively cultured in the bi-branch channel to generate a chemoattractant-forming chemical gradient. Sperm chemotaxis was represented by the ratio of the sperm swimming towards different branches. Results The percentage of motile sperm was improved from ( 58. 5 ± 3. 8 ) % to ( 82. 6±2.9)% by a straight channel 7 mm in length and 1 mm in width. About 10% of sperm were found chemotactically responsive in our experiment, which is consistent with previous studies. Conclusion The combined evaluation of both sperm motility and chemotaxis was achieved for the first time, and the motile and chemotactically responsive sperm can be easily enriched on a lab-on-a-chip device to improve IVF outcome.

Arthroscopic double-bundle double-tunnel anterior cruciate ligament reconstruction using multi-strand hamstring autograft / 中南大学学报(医学版)

OBJECTIVE@#To explore surgical reconstruction and clinical effect of arthroscopic double-bundle double-tunnel reconstruction of anterior cruciate ligament (ACL) with multi-strand hamstring tendons autograft.@*METHODS@#Twenty-one patients (13 males and 8 females) with ACL deficiency were diagnosed with arthroscopy, with an average age of 25.4 (17 approximately 50) years. The 2 separate tibial tunnels and 2 femoral tunnels were drilled on the footprint of the ACL to reconstruct the anteromedial and posterolateral bundles with arthroscopy.Tendons were fixed with Endo-button/polyester tape constructs at the femoral side and with biodegradable interference screw at the tibial side.@*RESULTS@#All patients were followed up for 15.8 (13 approximately 23) months. The anterior drawer test was positive in all patients and Lachman test was positive in all but 2 preoperatively. The postoperative results of anterior drawer test were negative in all but 1 at 90 degree of knee flextion. Lachman test was positive in 1, suspiciously positive in 1 and negative in other patients. The Lysholm knee score increased from 36 approximately 58 preoperatively to 71 approximately 95 postoperatively and the fineness rate was 95.2%.@*CONCLUSION@#Arthroscopic double-bundle double-tunnel reconstruction ACL with multi-strand hamstring tendons autograft is effective and reliable to restore the better dynamic stability of the knee.

Reconstruction of knee medial collateral ligaments / 中南大学学报(医学版)

OBJECTIVE@#To explore surgical reconstruction therapy and clinical effect of serious medial collateral ligament ruptures of the knee.@*METHODS@#Thirty-three patients with medial collateral ligament rupture were treated by operative repair and reconstruction. The degree of injury in all patients was Grade III. Some patients complicated with posterior medial capsule and anterior cruciate ligament, complete posterior cruciate ligament rupture, and some complicated with menisci injury, even tibial plateau fracture. After repairing the anatomical structure of medial collateral ligaments, we liberated organic semitendinous tendon or bone-patella tendon-bone, and reconstructed superficial medial collateral ligament.@*RESULTS@#Thirty-three patients were followed up for 43.1(3 approximately 71) months. After the operation, conditions were improved obviously. Instability and pain of knee released in 27 patients, 5 patients felt pain, and 4 patients still had dysfunction of knee flexion and extension. Stress X-ray showed that: 1 patient's knee joint space widened over 5 mm. According to Lysholm scoring system, the postoperative score was significantly higher than the preoperative score (P<0.01).@*CONCLUSION@#Medial collateral ligament reconstruction based on repairing the anatomical structure is effective and satisfactory. Autologous bone-patella tendon-bone or semitendinous tendon is a good choice for medial collateral ligament reconstruction.

The signal pathways involved in the effects of thyroid stimulating antibody on the secretory function of thyrocytes / 中国实用内科杂志

Objective To investigate the signal pathways involved in the effects of thyroid stimulating antibody(TSAb)on the secretory function of cultured thyrocytes.Methods (1)With the method of enzyme-linked immunosorbent assay (ELISA),the PKA and PKC activities were observed.(2)Inhibitors or activators of protein kinases (PKA and PKC) were used to activate or block the signal pathways and the secretion of T3 measured by radioimmunoassay.Results (1)TSAb activated both PKA and PKC in thyrocytes in a dose-,time-dependent manner(.P.

Thyroid nodules:thyroidectomy or observation? / 中国实用内科杂志

Thyroid nodules are very common.Its etiological factors include hyperplasia,adenomas,cancer,cysts,and thyroiditis.Most of thyroid nodules are benign.The management of thyroid nodules whether thyroidectomy or observation is according to their nature.So,the key of the therapy is to identify that they are benign or malignant.We should comprehensive evaluate patients' history,physical examination,laboratory examination,and auxiliary examination for judging the nature of thyroid nodules and making decision in the choose of thyroidectomy or observation.

Protective Effect of Bayberry Polyphenol on Platelet Damages in Mice and Rats / 中国药房

OBJECTIVE:To investigate the effect of bayberry polyphenol(BPP) on thrombopenia induced by cytotoxic drug and radiation in mice and rats.METHODS:The mice and rats were treated with cyclophosphamide and 60Co-? radiation to establish the animal thrombopenia models.RESULTS:Platelet counts were increased in BPP treated animals with a significant difference compared with the controls(P

THERAPEUTIC EFFECTS OF DIFFERENT DOSE OF METHIMAZOLE IN PATIENTS WITH GRAVES' DISEASE / 中华内分泌代谢杂志

The effects of different dose of methimazole (MMI) and different mode of drug administration were compared in patients with Graves' disease. 155 patients were divided into 5 groups at random: group A 10 mg MMI 3 times daily, group B 30 mg once daily, group C 5 mg 3 times daily, group D 15 mg once daily, group E 10 mg daily. The durations to achieve euthyroidism were not significantly different in group A, B, C and D (3.9? 1.5, 3.8? 1.3, 4.1 ? 1 .6 4.1 ?1.7 weeks respectively), but in group E (7.8?2.1 weeks) it was apparently longer than in other groups. The rate of side-effects occurring in patients treated with 30 mg, 15 mg and 10 mg daily was 37.7%, 14.7% and 5.6% respectively. Intrathyroidal concentrations of MMI were measured by means of high-performance liquid chromalo-graphy in 25 patients who underwent thyroidectomy. There was no difference of MMI concentrations in thyroid glands between the patients treated with 15 mg/d (39.1 ?15.2 ?mol/kg) and those with 30 mg/d(42.4? 14.3 ?mol/kg), or between the patients receiving the same dose on divided daily dose and single daily dose. These data demonstrate that 15 mg MMI as a single daily dose is reasonable and effective for the treatment of hyperthyroidism.

Effect of thyroid stimulating antibody on thyroid peroxidase activity in cultured thyrocytes / 中华内分泌代谢杂志

Objective To investigate the effects of thyroid stimulating antibody (TSAb) on the thyroid peroxidase (TPO) activity and its signal transduction pathways in cultured thyrocytes. Methods The TPO activity in primary cultured human thyrocytes was determined by amended guaiacol oxidation assay. At the same time, inhibitors of signal transduction were applied and the roles of cAMP/protein kinase A (PKA), phosphatidylinositol (PIP 2)/Ca 2+and tyrosine protein kinase (TPK) pathway on the TPO activity in cultured thyrocytes were observed. Results TSAb significantly enhanced the TPO activity in cultured thyrocytes, and the peak of TPO activity (360% of controls) reached with 4 mg/ml TSAb for 48 h. Addition of PKA inhibitor for blocking cAMP/PKA pathway decreased TPO activity by 79.2% (P