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As RNA-based medicines rapidly advance, from vaccines to next-generation therapies for cancer and chronic disease, one truth remains clear: these powerful molecules are only as effective as the systems that deliver them.

The promise of RNA—and the problem holding it back

RNA therapeutics represent one of the most promising drug classes of the last decade. By mimicking or modifying the body’s own RNA, these treatments can:

Replace or silence faulty gene expression,

Target previously “undruggable” proteins,

And potentially even cure rather than manage chronic conditions.

However, RNA therapies face one stubborn barrier: delivery.

RNA is inherently unstable,it degrades rapidly in the bodyand it struggles to cross cell membranes. It rarely reaches the right cells—and when it does, often fails to escape the endosome to carry out its function.

Most current delivery systems—such as lipid nanoparticles (LNPs) or viral vectors—are limited in scope:

LNPs are largely restricted to the liver.

Viral vectors carry safety risks and manufacturing complexities.

Both typically rely on injection and often require high doses to achieve therapeutic effect.

These limitations restrict the types of diseases RNA therapies can treat—and the patients who can benefit from them.

N4 Pharma’s Nuvec® delivery system is designed to overcome these barriers.

Nuvec is a silica nanoparticle with a proprietary spiky surface structure that physically traps RNA and other nucleotides, protecting them from degradation and enabling controlled delivery into target cells.

This unique architecture delivers multiple key advantages:

Payload protection against enzymatic breakdown

Efficient cellular uptake and enhanced endosomal escape

Co-loading of multiple RNA types (e.g., mRNA and siRNA)

Scalable, low-cost manufacturing using abundant materials

Think of Nuvec as a sticky burr attaching to RNA molecules—holding them safely in transit, then releasing them efficiently within target cells.

Our lead program, N4-101, showcases the unique capabilities of Nuvec.

This candidate is an orally administered RNA therapy for ulcerative colitis, a form of inflammatory bowel disease (IBD) that affects millions worldwide.

An siRNA that silences TNF-α, a key driver of gut inflammation

An mRNA that boosts IL-10, the body’s natural anti-inflammatory signal

A mannose ligand to precisely target macrophage cells in the gut

This dual approach—delivered via a pH-controlled enteric capsule—is designed to reduce inflammation at the source, without systemic side effects or injection.

In preclinical studies, N4-101 has demonstrated:

Elevated IL-10 levels in the gut and bloodstream

These findings underscore Nuvec’s potential not just for IBD, but for a wide range of localized, targeted RNA applications.

Beyond injection: a future of oral and topical RNA therapies

The RNA revolution will only reach its full potential by investing in delivery systems that overcome the limitations of current methods.

RNA therapies should be targeted, not systemic

Delivery systems should be scalable, cost-effective, and safe

Patients deserve treatments that are convenient, precise, and transformative

Nuvec enables all of this. It’s not just a delivery system—it’s a platform for rethinking how RNA medicines are made, delivered, and experienced.

We’re currently advancing Nuvec through ongoing preclinical programs, focused first on IBD and expanding into additional therapeutic areas.

If you’re a partner in biotech, pharma, or academic research looking to:

Improve the bioavailability of your RNA payloads,

—we invite you to connect with our team.

The next generation of RNA medicine won’t be defined by the payload. It will be defined by how (and where) it’s delivered.

As always, if you have any questions please submit them below and we will get back to you as soon as we can.