One of the main clinical treatments for advanced nasopharyngeal carcinoma is chemotherapy, but systemic administration can cause serious adverse reactions. New type of nanomaterial which can actively targeting, imaging, and treating nasopharyngeal carcinoma at the same time to enhance the effect of chemotherapy, meanwhile monitoring the intracellular drug release process at the level of single cancer cell was urgently needed. GE11, an EGFR antagonist peptide, was used to target nasopharyngeal carcinoma which has positive expression of EGFR on its nucleus. GE11‐modified graphene quantum dots (GQDs@GE11) were used as drug carriers for clinical chemotherapeutics cisplatin (CDDP) and doxorubicin (DOX). The emission spectrum of GQDs (460 nm) and the excitation spectrum of DOX (470 nm) have a good overlap, thus the transfer and release process of DOX can be sensitively detected by the fluorescence resonance energy transfer (FRET). CDDP was used to enhance the chemotherapy effect of nanoprobe, and the loading amount of DOX and CDDP on GQDs@GE11 nanoprobe were up to 67 and 50 mg/g, respectively. In vivo experiments have confirmed that GQDs@GE11/CDDP/DOX nanoprobe can be enriched to tumor site through specific targeting effect, and significantly inhibit tumor cell proliferation. This new type of targeted therapy fluorescent probe provides new ideas for the study of drug release process and the treatment of nasopharyngeal carcinoma.

No abstract

No abstract

Background: This study sought to establish a rat model of hypoparathyroidism by removing the rat parathyroid glands, and compare the effects of different transplantation sites and transplantation methods using a primary culture of parathyroid cells in vitro on the hormone secretion of the model rats.Methods: Male Sprague Dawley (SD) rats were selected for in vivo parathyroid gland removal, and rats with abnormal postoperative water intake, weight gain, parathyroid hormone (PTH), and blood calcium ion concentration were selected as transplant recipients and divided into the model group, brachioradialis muscle cell transplantation group, gelatin sponge group, and subcutaneous transplantation group. The parathyroid tissue was removed and the primary cell culture was performed in vitro using homozygous SD rats as graft donors. When the parathyroid cells were able to secrete PTH, transplantation was performed, and the postoperative recovery of the PTH function of the rats with different transplantation sites and methods were observed.Results: A recipient model with low PTH was successfully established, and parathyroid progenitor cells with obvious PTH secretion were obtained. Better secretion was observed in the brachioradialis cell group compare with other groups. Conclusions:The in vitro primary cell culture of the donor parathyroid cells combined with cell transplantation significantly improved the physiological function of the hypoparathyroid rats, and could potentially replace traditional clinical brachioradialis muscle tissue transplantation.