To investigate the angiotensin I-converting enzyme (ACE) inhibitory activity of beta-chain hemoglobin fragments, 17 fragments were synthesized by microwave-assisted solid-phase synthesis method. Wang resin or Trt(2-Cl) resin, Fmoc and HBTU-HOBt were used as solid carrier, N-terminal amino acid protecting groups and coupling reagents, respectively. The ACE inhibitory, alpha-glucosidase inhibitory, antibacterial and antitumor activities of the synthesized fragments were assayed. In vitro, Val-Val-Tyr-Pro-Trp-Thr showed high ACE inhibitory activity (IC50 = 7.42 micromol x L(-1)). The results indicate that there are two active sites in Val-Val-Tyr-Pro-Trp-Thr-Gln-Arg-Phe, one consists of Val-Val-, and the other -Gln-Arg-Phe. Peptides showed high ACE inhibitory activity when the N-terminal was hydrophobic amino acid such as Val and C-terminal tripeptide contained Phe, Trp or Arg. Some of the fragments showed low a-glucosidase inhibitory activity. No antibacterial activity or antitumor activity was detected in vitro. The results indicate that these peptides have a potential antihypertensive effect and possible application in the treatment of hypertension.

Objective Combination of chemotherapy regimens and chemoradiotherapy to the curative effect of locally advanced nasopharyngeal carcinoma is unclear. The carcinoma radiotherapy adverse reaction and curative effect were investigated in nedaplatin plus fluorouracil in the same period radiotherapy(Group NF)compared with cisplatin(DDP)in the same period (Group DDP)in the treatment of locally advanced nasopharyngeal. Method Patients with locally advanced(ⅢandⅣB)nasopharyngeal carcinoma(NPC)in Sun yat?sen university cancer hospital were enrolled and divided into two groups:222 cases in the NF group and 165 cases in the DDP group. The adverse reaction,5?year progression?free survival(PFS)and overall survival(OS)for 5 years were evaluated in two groups. Results The 5?year PFS in the NF and DDP group was 85.13%and 82.42%,respectively, with no significant difference. The 5?year OS in the NF and DDP group was 85.58% and 82.42%,respectively, with no significant difference. The proportion of oral mucositis in the NF group was significantly lower than that in the DDP group. Conclusion Nedaplatin plus fluorouracil radiation therapy has similar curative effect ,adverse reaction with cisplatin plus the same radiation therapy in the treatment of locally advanced nasopharyngeal carcinoma.