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In this article number 10.1002/bmm2.12119, Muyuan Chai, Wenwen Zhong and their co-workers present a method for creating novel extruded 3D printing inks using hydrogen-bonded cross-linked hydrogels, called DIPS 3D printing. Urea acts as a switch for the gel-sol transition of DIPS inks, enabling fast, high-fidelity 3D printing under mild conditions. The printed DIPS scaffold can be used as a tissue-engineered scaffold for dynamic organ repair.

In this article number 10.1002/bmm2.12120, a kind of infection-responsive drug-loaded nano-assembly, STQ12, was developed by the electrostatic interaction between negatively charged polysaccharide and positively charged quaternized ammonium salt polymer. STQ12 could penetrate the mucus layer rapidly and reach the acidic microenvironment at the infected site, releasing the loaded drug and QPEI-C6 to realize combined anti-infection therapy against multi-drug resistant bacteria.

Cephalofurimazine (CFz), when paired with Antares luciferase, shows superior blood-brain barrier permeability and enhanced imaging depth and clarity for deep brain imaging. This bioluminescence provides a less invasive method for real-time monitoring of deep brain activity, with the potential to advance targeted therapies and deepen our understanding of brain functions. Further molecular engineering and localized delivery can reduce the potential toxicity of CFz and enhance its efficacy for clinical deep brain imaging.

Tumor cells often exhibit metabolic abnormalities to meet the needs of rapid proliferation, and targeting tumor metabolism has become one of the effective strategies for cancer treatment. However, most of the current methods targeting metabolism focus on inhibiting hyperactivated metabolic pathways, hindering their further application. A recent innovative work, proposed a nutrient-based strategy to reactivate metabolism for tumor therapy by targeting suppressed metabolic pathways. This approach through delivering nutrients to tumor cells directly using nanotechnology indicates that specific nutrients can serve as potent activators of metabolic pathways. As a new direction along the reverse thinking, this study suggests that this nutrient-based metabolism reactivation strategy will inspire broad applications in the treatment of other diseases associated with metabolic disorders, besides tumor.

Many hydrogen-bonded cross-linked hydrogels possess unique properties, but their limited processability hinders their potential applications. By incorporating a hydrogen bond dissociator (HBD) into these hydrogels, we developed injectable 3D printing inks termed diffusion-induced phase separation (DIPS) 3D printing inks. Upon extrusion into water and subsequent diffusion of HBD, these ink cure rapidly. The DIPS-printed scaffold retained most of the original hydrogel properties due to the regeneration of hydrogen bonds. Additionally, the reversible nature of hydrogen bonds provides DIPS 3D-printed scaffolds with exceptional recycling and reprinting capabilities, resulting in a reduction in the waste of valuable raw ink materials or additives. Postprocessing introduces new crosslinking methods that modulate the mechanical properties and degradation characteristics of DIPS scaffolds over a broad range. Based on its suitable mechanical properties and bioactivity, we successfully repaired and functionally reconstructed a complex defect in penile erectile tissue using the DIPS scaffold in a rabbit model. In summary, this approach is relevant for various hydrogen-bonded cross-linked hydrogels that offer mild printing conditions and enable the incorporation of bioactive agents. They can be used as scaffolds for dynamic tissue reconstruction, wearable devices, or soft robots.

In this article number 10.1002/bmm2.12077, Guiqiang Zhang, Ning Wang and their co-workers developed stimulator of interferon genes (STING)-activating nanoparticles via metal coordination-driven assembly of a synthetic STING agonist and a phenolic chemotherapeutic drug. These nanoparticles could efficiently accumulate in tumors, leading to potent STING pathway activation, induction of immunogenic cell death, and regulation of amino acid metabolism. The antitumor immunity induced by nanoparticles could significantly inhibit the growth of primary, recurrent, and metastatic tumors, providing a novel paradigm for tumor chemo-immunotherapy.

Advanced strategies for combinational immunotherapy of cancer based on polymeric nanomedicines have been timely, concisely and fully discussed in this article number 10.1002/bmm2.12067, with an outlook on the current challenges and potential solutions.