[Evaluation of the impact of genetic background on islet beta-cell function of normal glucose tolerance and newly diagnosed diabetic patients by L-arginine stimulation test.].

OBJECTIVE: To explore the impact of genetic background on pancreatic beta-cell first-phase secretion function with L-arginine (L-ARG) stimulation test. METHODS: Plasma insulin level was detected in 201 cases before and after L-ARG stimulation test. Among them, 61 cases were newly diagnosed type 2 diabetic patients with family history of diabetes (FH+DM), 55 newly diagnosed type 2 diabetic patients without family history of diabetes (FH-DM), 31 with normal glucose tolerance and family history of diabetes (FH+) 54 with normal glucose tolerance but without family history of diabetes (FH-). Homeostasis model assessment (HOMA) was used to estimate insulin resistance (HOMA-IR). RESULTS: It was premised that gender, age and BMI were similar among the 4 groups. (1) TC, TG, fasting plasma glucose, 2h plasma glucose, fasting insulin and HOMA-IR in the two groups of newly diagnosed type 2 diabetic patients with or without family history of diabetes were significantly higher than those in the two groups of normal glucose tolerance with or without family history of diabetes. The multiples of the peak level and the base level of insulin secretion in the groups of newly diagnosed diabetes were significantly lower than those in the groups of normal glucose tolerance with and without family history (P < 0.05). (2) Insulin secretion reached a peak in 2 minutes and started to decline in 4 minutes in all the four groups. (3) The multiples of the peak level and the base level of insulin secretion in normal glucose tolerance group with family history of diabetes were 20.8% lower than those in the group without family history, being 7.27 and 9.18 respectively (P < 0.05). (4) Two-minute peak insulin secretion, HOMA-IR and age in the newly diagnosed type 2 diabetic group with family history of diabetes was significantly lower than these in the group without family history (P < 0.05). The multiples of the peak level and the base level of insulin secretion in the newly diagnosed type 2 diabetic group with family history of diabetes and that group without family history were 5.18 and 5.31 respectively and there was no significant difference between the two groups (P > 0.05). (5) When the normal glucose tolerance subjects with family history of diabetes progressed to suffer from diabetes, the multiples of the peak level and the base level of insulin secretion declined 43.6% (P < 0.05) more than those in the subjects still with normal glucose tolerance without family history. CONCLUSION: In the early course of diabetes, insulin resistance dose not function significantly, but genetic background make the first-phase secretory function of the beta-cell to decline gradually and type 2 diabetes occurs easily. In the absence of genetic background, insulin resistance makes first-phase the secretion of insulin to decline relatively slow.

Expression and clinical significance of syndecan-1 mRNA and HPA-1 mRNA in colorectal cancer detected with real-time fluorescent quantitative polymerase chain reaction.

BACKGROUND AND OBJECTIVE: Invasion and metastasis are the most common causes of mortality for patients with colorectal neoplasms, and blocking invasion and metastasis in a timely fashion has become a hot research focus. We investigated the expression of the messenger RNA of Syndecan-1 and HPA-1 in colorectal cancer, and their correlation with invasion and metastasis. METHODS: Real-time fluorescent quantitative polymerase chain reaction (PCR) was used to detect the expression of Syndecan-1 and HPA-1 in specimens from 49 patients with colorectal cancer, 49 paired adjacent colorectal neoplasms (2 cm from the carcinoma), and 49 surgical margins of paired normal colorectal mucosa tissue (5 cm from the carcinoma), to analyze their correlation with clinicopathologic characteristics of colorectal neoplasm. RESULTS: The expression of HPA-1 mRNA was significantly higher in colorectal cancer (40.56 +/- 11.75) than that in the paired adjacent colorectal neoplasms (18.28 +/- 11.33) and normal colorectal mucosa tissue (10.80 +/- 10.20) (all P < 0.001). The expression of HPA-1 mRNA was significantly higher in paired adjacent colorectal neoplasms than that in normal colorectal mucosa (P < 0.05). The expression of Syndecan-1 mRNA was significantly higher in normal colorectal mucosa (61.21 +/- 12.96) than in the paired adjacent mucosa (14.35 +/- 11.06) or colorectal cancer (10.12 +/- 8.58) (all P < 0.001). The expression of Syndecan-1 mRNA was significantly higher in the paired adjacent mucosa than that in colorectal cancer (P < 0.05). The decreased expression of Syndecan-1 mRNA and the increased expression of HPA-1 were closely associated with the degree of differentiation, the depth of infiltration, lymph node metastasis, vessel metastasis, and TNM staging of colorectal cancer (all P < 0.05). Spearman rank correlation analysis demonstrated a significant correlation between Syndecan-1 and HPA-1(r = -0.405, P < 0.05). CONCLUSIONS: The expression of Syndecan-1 mRNA was significantly highest in normal colorectal mucosa and the expression of HPA-1 mRNA was significantly highest in colorectal cancer. At the same time, the decreased expression of Syndecan-1 mRNA and the increased expression of HPA-1 mRNA can promote the invasion and metastasis of colorectal cancer. The determination of Syndecan-1 and HPA-1 may be of value in the treatment as well as in the prognosis of patients with colorectal cancer.

Alteration of thromboxane A2 and prostacyclin levels in rats with obstructive jaundice and the effect of salviae miltiorrhizae on them / 中国中西医结合杂志

<p><b>OBJECTIVE</b>To observe the alteration of plasma levels of thromboxane A2 (TXA2) and prostacyclin (PGI2) as well as changes of microcirculation in renal cortex of obstructive jaundice model rats, and to study the effect of Radix Salviae miltiorrhizae (SM) on them.</p><p><b>METHODS</b>SD rats were randomly divided into three groups: the sham operation group (A), the common bile duct ligation model group (B), and the SM treated model group (C). Their blood plasma TXA2/PGI2 ratio (T/P), blood levels of urea nitrogen (BUN) and creatinine (Cr) were determined respectively in batches (8 rats from each group) on the 3 rd, 7th and 10th day, their capillary caliber (CC) in renal cortex was measured at the same time points using WX-9 type microcirculation microscope.</p><p><b>RESULTS</b>Compared with Group A, T/P was higher and CC was smaller in Group B at all the time points. Levels of BUN and Cr increased on day 7 and day 10 after modeling (P<0.05), and they were increasing markedly along with the elongation of the obstructive time (P<0.05). As compared with Group B, T/P was lower and CC was expanded in Group C, with levels of BUN and Cr lowered on day 10 (P<0.05).</p><p><b>CONCLUSION</b>T/P elevation and renal microcirculation obstacle are the important factors for inducing renal injury in obstructive jaundice, and SM shows a protective effect on kidney against the injury.</p>