Résumé
A fluorescent immunochromatographic test strip based on the quantum dots submicrobeads (QBs) was developed for quantitative detection of chloramphenicol (CAP). In this method, monoclonal antibody of CAP and OBs complex fluorescent probe was first prepared using 1-ethyl-3-( 3-dimethylaminopropyl ) carbodiimide / N-hydroxysuccinimide coupling approach, then complete antigen CAP-HS-BSA was synthesized and sprayed on nitrocellulose membrane as test line (T line). Similarly, goat anti-mouse antibody was sprayed as control line (C line). The time required for the analysis was 15 min, and the limit of detection (LOD) for CAP was 0. 1 μg / L, with a working range of 0. 1 - 100 μg / L. In spiked milk samples, the test strip demonstrated high recoveries in the range from 93. 3% to 97. 9% with relative standard deviations of less than 7% .
Résumé
Most monoclonal antibodies (mAbs) can induce immune responses.For immunomodulatory mAbs,immunotoxicity is the major toxicity.This article summarizes the characteristics of immunotoxicity,the factors associated with immunotoxicity,and the general considerations of nonclinical studies and evaluations.Before the clinical trials,comprehensive nonclinical studies on immunotoxicityshould be step by step conductedbased on mAbs' characteristics.If needed,some additional studies should be conducted.Attention should be paid to combination of in vivo and in vitro studies,combination of animal species and humanex vivo cells,and multiple approaches for studies.
Résumé
In the development process from the preclinical stage to the subsequent clinical phase,one critical risk controlling step is the determination of the first-in-human (FIH) dose.There is difference in the mechanisms of action and toxic risks between biopharmaceuticals and small molecule drugs,therefore different considerations will be involved in the determination of the FIH dose for biopharmaceuticals.This paper presents the overall review of the preclinical studies supporting the determination of FIH dose and the approaches based on the NOAEL,MABLE,and PK/PD model.The experience-based views that the MABLE-based FIH dose for immune activating products would be reasonably safe,although the NOAEL approach remains conservative and widely used for a majority of biopharmaceuticals are also presented.It is suggested that sponsors should determine the appropriate and safe FIH dose by diverse approaches according to the characteristics of product.Early communication between sponsors and regulators is always beneficial.
Résumé
In the development process from the preclinical stage to the subsequent clinical phase,one critical risk controlling step is the determination of the first-in-human (FIH) dose.There is difference in the mechanisms of action and toxic risks between biopharmaceuticals and small molecule drugs,therefore different considerations will be involved in the determination of the FIH dose for biopharmaceuticals.This paper presents the overall review of the preclinical studies supporting the determination of FIH dose and the approaches based on the NOAEL,MABLE,and PK/PD model.The experience-based views that the MABLE-based FIH dose for immune activating products would be reasonably safe,although the NOAEL approach remains conservative and widely used for a majority of biopharmaceuticals are also presented.It is suggested that sponsors should determine the appropriate and safe FIH dose by diverse approaches according to the characteristics of product.Early communication between sponsors and regulators is always beneficial.