Analysis of risk factors of thyroid nodules in patients with type 2 diabetes in the community / 上海交通大学学报（医学版）

Objective • To evaluate the prevalence, risk factors and the effects of macrovascular complications on the onset of thyroid nodules in patients with type 2 diabetes mellitus (T2DM) in the community. Methods • A total of 711 outpatients with T2DM from March 2015 to December 2017 in Community Family Doctor Outpatient Department and Department of Endocrinology and Metabolism of Fengxian District Central Hospital were selected. Anthropometric data and clinical test data were collected. Patients were divided into two groups based on the results of thyroid ultrasound. The Logistic regression analysis was used to analyze the risk factors for thyroid nodules in T2DM patients, such as age, sex, body mass index, glycolipid metabolism index, pancreatic function index, and thyroid function index. Furthermore, the effect of macrovascular disease on the onset of thyroid nodules was analyzed. Results • Of the 711 patients with T2DM, 438 (61.60%) had thyroid nodules, including 231 males (55.13% of the male population) and 207 females (70.89% of the female population). Comparison of anthropometry data, glycolipid metabolism index, pancreatic function index, and thyroid function index in groups with and without thyroid nodules revealed that there was a statistically significant difference in gender, age, duration of T2DM, 2-hour post-meal plasma glucose, total cholesterol, triglyceride, low density lipoprotein-cholesterol, free triiodothyronine, and thyroid peroxidase antibody between the two groups (P0.05). Conclusion • This study found that females, seniors, reduction of 2-hour post-meal plasma glucose, low density lipoprotein-cholesterol, and thyroglobulin antibody levels were the risk factors of thyroid nodules in T2DM patients in the community. There is no certain correlation between macrovascular complications and the occurrence of thyroid nodules in T2DM.

Effects of methyl jasmonate and salicylic acid on phenylethanoid glycosides synthesis in suspension cultures of Cistanche deserticola / 生物工程学报

The present study investigated the influence of the methyl jasmonate and salicylic acid elicitors on the formation of phenylethanoid glycosides (PeG) in the suspension cultures of Cistanche deserticola. The results showed that methyl jasmonate and salicylic acid enhanced greatly the accumulation of PeG and echinacoside (Echin), but their optimum elicitation dosage and addition time were different. The yields of PeG and Echin were significantly increased in the presence of 5 micromol/L methyl jasmonate on day 14 (up to 2.59-fold and 3.82-fold, respectively), whereas treated with 50 micromol/L salicylic acid on day 28, the maximum content of them were, respectively, 2.71 and 3.16-fold higher than the untreated cell cultures.

Effects of physical and chemical factors on hairy root growth and flavonoids biosynthesis in the cultures of Saussurea medusa Maxim hairy root / 生物工程学报

The effects of different physical and chemical factors on hairy root growth and flavonoids production were studied in suspension culture of Saussurea medusa hairy root in 1/2 MS medium. The results showed that the following culture conditions, nitrogen concentratiaon (involved NH4+ and NO3-), 30 mmol/L; the ratio of ammonium to nitrate, 5:25; the combination of 2% sucrose and 3% glucose; 0.5 mg/L GA3; 0.5 mg/L IBA; initial pH 5.8; light cycle, 18 h/d (3500lx); temperature, 24 degrees C; shaker revolutions per minute, 100 r/min, were favourable to hairy root growth and flavonoids production. Under the above culture conditions, up to 12.8 g/L (DW) of hairy root and 1922 mg/L of flavonoids were obtained after 21 days of culture. The content of total flavonoids in hairy root was 15%, which was about 25 times as that in the wild plantlet.

Establishment of Saussurea involucrata hairy roots culture and plantlet regeneration / 生物工程学报

Hairy root clones of Saussurea involucrata transformed with Agrobacterium rhizogenes strains R1601, R1000, and LBA9402 were established to investigate the flavonoid production. Opine synthesis and PCR analysis confirmed the integration of the T-DNA fragment of Ri plasmid from A. rhizogenes strain R1601 into the transformed root genome. The frequency of hairy root formation from root segments, which were pre-cultured 2 days in N6 solid medium without plant growth regulators, amounted to 100% following infection with R1601 strain of A. rhizogenes. The transformed roots were kept in hormone-free N6 liquid medium in the dark at 25 degrees C, 110r/min and routinely subcultured every 20 - 24 days. One hairy root clone, which grew vigorously with lateral branches, was periodically examined for the ability to produce flavonoid. The maximum of biomass and flavonoid yield achieved 66.7 g/L (fresh weight) and 102.3mg/g dry weight after incubation 20 days. The calli were induced from the hairy root culture in the presence of 0.5mg/L IBA and intact plantlets were regenerated from these calli. The regeneration plantlets from hairy roots, in which the flavonoid content were 53% in that of untransformed plants, weren't different in growth and morphology of the untransformed plantlets. Therefore plant regeneration from hairy roots may be also a means for producing transformed S. involucrata plants. Hairy root cultures of S. involucrata clearly showed higher flavonoid contents compared to the wild plant or the regeneration seedlings. As the wild S. involucrata grows only in special regions with peculiar climate, and cultivation of this species in a normal climate has been unsuccessful so far. The success in obtaining a method for high production of flavonoid might very well be one of the solutions for this problem in the future.

Cloning and sequence analysis of MYB transcriptional regulator SmP gene of Saussurea medusa Maxim / 生物工程学报

A full-length cDNA encoding a MYB-related regulatory gene was isolated from a cDNA library prepared from mRNAs of the red line callus of S. medusa by TD-PCR. The cDNA, designated SmP, is 969 nucleotides long and has an open reading frame of 771 bp with a deduced amino acid sequence of 256 residues. The putative protein of SmP has two typical conversed R2R3-Myb DNA-binding domains in N-terminal and displays a rather high degree of similarity to OsMYB from rice and LBMI from tobacco, showing 73% and 70% identity within the DNA-binding domains. However, the C-terminal domain of the SmP protein does not show obvious similarity to any other known protein sequence. It is rich in hydrophilic amino acids, especially in serine residues (18.38%), partly organized in homopolymeric stretches, a feature often found in activation domain of transcription factors.