Physical damage the fungus cannot evolve around
In laboratories at UC San Diego, researchers have found a way to disassemble the body's own immune cells and rebuild their outer membranes into microscopic particles capable of destroying drug-resistant fungal infections. The work addresses a quietly growing crisis: Candida albicans, responsible for everything from common yeast infections to fatal bloodstream disease, is evolving beyond the reach of conventional antifungal medicines. Rather than joining the endless chemical arms race between drugs and adapting fungi, this approach turns the body's own architecture into a physical weapon — one the fungus has no evolutionary playbook to defeat.
- Drug-resistant Candida infections are killing patients whose fungi have simply learned to outmaneuver every available treatment, and the pipeline of new antifungal drugs is dangerously thin.
- UC San Diego engineers have harvested the outer membranes of macrophages — the immune system's frontline soldiers — and rebuilt them as nanodiscs one thousand times smaller than the original cell, small enough to fuse directly with fungal membranes and tear them apart.
- Because the attack is physical rather than chemical, the fungus faces a threat it cannot reroute around: no single molecular target to mutate, no pathway to close off, just structural collapse.
- In infected mice, the nanodiscs slashed fungal loads across the heart, kidneys, lungs, and spleen, dramatically lifted survival rates, and even offered protection when given before infection struck.
- The treatment remains years from human trials, but the team is already expanding tests to other dangerous fungal species, and the underlying principle — weaponizing miniaturized immune cell membranes — opens a new class of infection-fighting strategies.
Researchers at UC San Diego have engineered a new class of antifungal weapon by dismantling immune cells and reassembling their outer membranes into nanoscale discs. Led by engineer Liangfang Zhang, the project targets Candida albicans — a fungus behind both everyday yeast infections and life-threatening bloodstream disease — at a moment when standard antifungal drugs are losing ground to evolving resistance.
Conventional antifungals work by attacking specific molecular targets, but fungi repeatedly exposed to these drugs gradually mutate around them. Zhang's team bypassed this arms race entirely. Instead of exploiting a chemical vulnerability, their nanodiscs physically rupture the fungal cell's protective outer membrane — a brute-force strategy that offers the fungus no obvious evolutionary escape route.
The particles are built from macrophage membranes, extracted from white blood cells and fused onto biodegradable polymer cores. Each nanodisc measures just 10 to 20 nanometers across — roughly one-thousandth the size of the macrophage it came from. That miniaturization is what makes them lethal: they can merge directly with fungal membranes in ways full-sized immune cells cannot, causing the fungal cell to leak and collapse. Because they carry real macrophage proteins, they also recognize and bind to Candida with biological precision.
The nanodiscs do more than kill directly. Candida normally suppresses macrophages from producing their natural antifungal chemicals; the nanodiscs reverse that suppression and amplify it. They also block the fungus from forming biofilms — the protective shields that help Candida hide from both drugs and immune attack.
In mouse trials, treated animals showed dramatically reduced fungal burdens across multiple organs, and survival rates improved substantially — with some groups seeing every treated animal survive. The particles also offered protection when given before infection, hinting at a future preventive role.
Published in Cell Biomaterials, the work is a proof of concept rather than a finished therapy. The team plans to test the approach against a wider range of dangerous fungal species, and the road to human patients remains long. But the core insight — that immune cell membranes can be harvested, miniaturized, and turned into precision weapons — marks a genuinely new direction in the fight against infections that conventional medicine is struggling to contain.
Researchers at UC San Diego have engineered a new weapon against fungal infections by taking apart immune cells and reassembling their outer membranes into microscopic particles. The work, led by Liangfang Zhang in the university's engineering school, targets Candida albicans—a fungus that causes everything from common yeast infections to severe, life-threatening bloodstream infections. In mice suffering from severe Candida infections, these nanoparticles dramatically reduced fungal populations in vital organs and substantially increased survival rates.
The problem the team set out to solve is increasingly urgent. Standard antifungal drugs work by attacking specific molecular targets inside fungal cells, but as fungi encounter these drugs repeatedly, they evolve resistance, rendering treatments less effective over time. Zhang's approach sidesteps this evolutionary arms race entirely. Instead of targeting a single vulnerability, the nanoparticles physically rupture the fungal cell's protective outer membrane—a brute-force strategy that fungi cannot easily adapt to.
To build these particles, the researchers extracted the outer membranes from macrophages, a type of white blood cell that serves as the body's frontline defense against infection. They fragmented these membranes and fused them onto disk-shaped cores made from biodegradable polymer material. The resulting nanodiscs, each measuring 10 to 20 nanometers across, are roughly 1,000 times smaller than an actual macrophage. This miniaturization proves crucial: the nanodiscs can directly fuse with fungal cell membranes and destabilize them in ways that full-sized immune cells cannot.
Because the nanodiscs are built from real macrophage membranes rather than synthetic substitutes, they retain the natural proteins that macrophages use to recognize and attack fungi. This means the particles can identify Candida cells with precision and attach to them effectively. Once bound, the nanodiscs systematically weaken the fungal membrane until breaches form. The fungal cell's contents leak out while harmful substances seep inward, ultimately killing the organism. The physical nature of this attack makes it extraordinarily difficult for the fungus to develop resistance—there is no single molecular lock to pick, no chemical pathway to reroute.
The nanodiscs also work as immune system amplifiers. Candida has evolved a cunning defense: it suppresses macrophages from producing natural antifungal chemicals. The nanodiscs not only reverse this suppression but actually push macrophages to produce higher levels of these fungus-fighting compounds. Additionally, the particles prevent Candida from forming biofilms—protective shields that allow fungal cells to hide from both drugs and immune attack.
When the team administered the nanodiscs to infected mice, the results were striking. Treated animals showed far less fungus in their hearts, kidneys, lungs, and spleens compared to untreated controls. Survival rates improved substantially, and in some cases, all treated mice survived. Higher doses provided greater protection. The nanodiscs also worked when given before infection occurred, suggesting they might eventually serve a preventive role.
The research, published in Cell Biomaterials, represents a proof of concept rather than a finished treatment. The team plans to test these cellular nanodiscs against a broader range of dangerous fungal species. The path from mouse studies to human patients remains long, but the fundamental insight—that immune cell membranes can be harvested, miniaturized, and weaponized against pathogens—opens a new frontier in fighting infections that have grown increasingly resistant to conventional drugs.
Citas Notables
The nanodiscs physically damage fungal cells and simultaneously boost the body's natural immune defenses, using a strategy that may be much harder for fungi to evolve resistance against.— Research approach described by Liangfang Zhang's team at UC San Diego
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Why use macrophage membranes specifically? Why not just engineer synthetic particles that mimic their shape?
Because the real thing carries information. A synthetic particle might look like a macrophage, but it wouldn't have the actual proteins macrophages use to recognize Candida. You'd be building a decoy instead of a tool. The membrane proteins are what let the nanodiscs find and stick to the fungus in the first place.
So the nanoparticles are essentially borrowing the immune system's own language to talk to the fungus.
Exactly. And because they're made from the body's own cells, the immune system doesn't attack them as foreign invaders. They slip through undetected while doing their work.
You mentioned the fungus has evolved ways to survive inside macrophages. How do these tiny particles get around that problem?
Size is the answer. A macrophage engulfs the fungus whole, which gives Candida room to hide and eventually escape. But a nanodisc is so small it can fuse directly with the fungal membrane and punch holes in it. The fungus can't swallow something that's already tearing it apart from the outside.
And the resistance problem—why is physical damage harder to evolve around than a chemical target?
Because there's no single pathway to block or reroute. You can't mutate your way out of a ruptured membrane. It's like the difference between a lock that can be picked and a wall that has to be climbed. The fungus would need to completely redesign its outer structure, which is far more fundamental than adjusting one protein.
What happens next? When do humans get access to this?
That's still years away. They've proven it works in mice. Now they test it against other dangerous fungi, refine the manufacturing, and eventually move toward human trials. But the principle is solid enough that other researchers are probably already thinking about how to apply it to different pathogens.