Bone remodeling or orthodontic treatment is usually a long-term process. It is highly desirable to speed up the process for effective medical treatment. In this work, a self-powered low-level laser cure system for osteogenesis is developed using the power generated by the triboelectric nanogenerator. It is found that the system significantly accelerated the mouse embryonic osteoblasts' proliferation and differentiation, which is essential for bone and tooth healing. The system is further demonstrated to be driven by a living creature's motions, such as human walking or a mouse's breathing, suggesting its practical use as a portable or implantable clinical cure for bone remodeling or orthodontic treatment.
Insulin has a narrow therapeutic index, reflected in a small margin between a dose that achieves good glycemic control and one that causes hypoglycemia. Once injected, the clearance of exogenous insulin is invariant regardless of blood glucose, aggravating the potential to cause hypoglycemia. We sought to create a "smart" insulin, one that can alter insulin clearance and hence insulin action in response to blood glucose, mitigating risk for hypoglycemia. The approach added saccharide units to insulin to create insulin analogs with affinity for both the insulin receptor (IR) and mannose receptor C-type 1 (MR), which functions to clear endogenous mannosylated proteins, a principle used to endow insulin analogs with glucose responsivity. Iteration of these efforts culminated in the discovery of MK-2640, and its in vitro and in vivo preclinical properties are detailed in this report. In glucose clamp experiments conducted in healthy dogs, as plasma glucose was lowered stepwise from 280 mg/dL to 80 mg/dL, progressively more MK-2640 was cleared via MR, reducing by ∼30% its availability for binding to the IR. In dose escalations studies in diabetic minipigs, a higher therapeutic index for MK-2640 (threefold) was observed versus regular insulin (1.3-fold).
Several classes of PHD enzyme inhibitors have been disclosed and several are currently in clinical trials for the development of small molecule-based therapeutics for the treatment of anemia.
Macrocyclic peptides
open new opportunities to target intracellular
protein–protein interactions (PPIs) that are often considered
nondruggable by traditional small molecules. However, engineering
sufficient membrane permeability into these molecules is a central
challenge for identifying clinical candidates. Currently, there is
a lack of high-throughput assays to assess peptide permeability, which
limits our capacity to engineer this property into macrocyclic peptides
for advancement through drug discovery pipelines. Accordingly, we
developed a high throughput and target-agnostic cell permeability
assay that measures the relative cumulative cytosolic exposure of
a peptide in a concentration-dependent manner. The assay was named
NanoClick as it combines in-cell Click chemistry with an intracellular
NanoBRET signal. We validated the approach using known cell penetrating
peptides and further demonstrated a correlation to cellular activity
using a p53/MDM2 model system. With minimal change to the peptide
sequence, NanoClick enables the ability to measure uptake of molecules
that enter the cell via different mechanisms such as endocytosis,
membrane translocation, or passive permeability. Overall, the NanoClick
assay can serve as a screening tool to uncover predictive design rules
to guide structure–activity–permeability relationships
in the optimization of functionally active molecules.
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