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He's perched on a tan recliner at the Center for Alzheimer Research and Treatment at Brigham and Women's Hospital in Boston. His wife, Karen Walsh, hovers over him, ready to depress the plunger on a nasal spray applicator.

"One, two, three," a nurse counts. The plunger plunges, Walsh sniffs, and it's done.

The nasal spray contains an experimental monoclonal antibody meant to reduce the Alzheimer's-related inflammation in Walsh's brain.

He is the first person living with Alzheimer's to get the treatment, which is also being tested in people with diseases including multiple sclerosis, ALS and COVID-19.

And the drug appears to be reducing the inflammation in Walsh's brain, researchers report in the journal 

"I think this is something special," says Dr. Howard Weiner, a neurologist at Mass General Brigham who helped develop the nasal spray, along with its maker, Tiziana Life Sciences.

Whether a decrease in inflammation will bring improvements in Walsh's thinking and memory, however, remains unclear.

The experimental treatment is part of a larger effort to find new ways to interrupt the cascade of events in the brain that lead to Alzheimer's dementia.

Two drugs now on the market clear the brain of sticky amyloid plaques, clumps of toxic protein that accumulate between neurons. Other experimental drugs have targeted the tau tangles, a different protein that builds up inside nerve cells.

But fewer efforts have tried to address inflammation, a sign of Alzheimer's that becomes more pronounced as the disease progresses.

Once Joe Walsh has finished inhaling the experimental medication, he gets a cognitive exam from Dr. Brahyan Galindo-Mendez, a neurology fellow.

"Can you tell me your name please," Mendez asks. "What's your name?"

"And who is with you today?" Mendez says, glancing toward Walsh's wife, Karen.

"Her name," Walsh echoes. "That's her name. That's my wife."

Walsh is unable to put a name to the woman he's been married to for 36 years.

Karen Walsh began to notice a change in her husband back in 2017.

"He was struggling to find the right words to complete a thought or a sentence," she says.

The couple went to a primary care doctor, who said that if Walsh turned out to have Alzheimer's, he should enter a research study in hopes of getting one of the latest treatments. Then the doctor referred Walsh to a neurologist.

In 2019, a PET scan revealed extensive amyloid plaques in Walsh's brain, confirming the diagnosis.

"As much as I was in shock," Karen Walsh says, "the words were ringing in my head: 'ask for the research.'"

So she began looking for a clinical trial. But in 2020, COVID arrived in the U.S., shuttering hundreds of research studies. By the time the pandemic subsided, Walsh's Alzheimer's had progressed to the point where he no longer qualified for most studies.

In late 2024, Karen brought Joe to Dr. Seth Gale, a neurologist at Mass General Brigham and Harvard Medical School who promised to look for a research study Walsh could enter.

Before long, Gale received a query from a colleague looking for a patient with moderate Alzheimer's disease to take part in a trial. He called the Walshes.

The research involved a monoclonal antibody called foralumab that was being tested on people with inflammatory diseases including multiple sclerosis.

MS occurs when the immune system mistakenly attacks the protective covering around nerve fibers, causing inflammation. And foralumab was producing promising results in MS patients.

"It induces regulatory cells that go to the brain and shut down inflammation," Weiner says.

Those regulatory cells reduce the activity of microglia, the cells that serve as the primary immune system in the brain and spinal cord.

Weiner thought foralumab might help with another condition that causes damaging inflammation in the nervous system.

"I've always been interested in Alzheimer's disease," Weiner says. "I lost my mother to Alzheimer's disease."

Most efforts to treat Alzheimer's involve clearing the brain of the disease's hallmarks: sticky amyloid plaques and tangled fibers called tau. But increasingly, researchers are seeking ways to tamp down the inflammation that accompanies those brain changes, especially as the disease progresses.

"Once people have Alzheimer's, the inflammation is driving the disease more," Weiner says.

The approach worked in mice that develop a form of Alzheimer's.

But in order to treat Walsh, Weiner's team had to get special permission from the Food and Drug Administration through a program called expanded access. The program is for patients who can't get into a clinical trial and have no other treatment options.

When the FDA approved foralumab for Walsh, he became the first Alzheimer's patient to get the treatment.

Six months later, the drug has dramatically reduced the inflammation in Walsh's brain. But no drug can restore brain cells that have already been lost.

It will take a battery of cognitive tests to see if Walsh's memory and thinking have improved with the treatment. Karen Walsh, though, sees some positive signs.

Although her husband still struggles to find words, she says, he appears to be more engaged in social activities.

"A couple of guys come pick him up once a month, you know, and they take him out for lunch," she says. "They sent me a text after saying, 'Wow, Joe is really, really laughing, and very involved.'"

Walsh himself seems happy to stay on the drug. Between non sequiturs, he manages to put together a complete sentence: "It's easy enough to take it, so I do it, and it feels good."

A clinical trial of foralumab for Alzheimer's disease is scheduled to begin later this year. 

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Joe Walsh is the first Alzheimer's patient to be treated with an experimental nasal spray designed to reduce inflammation in the brain.

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