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Urinary incontinence is a devastating condition affecting over 33 million Americans, according to the National Association for Continence, leading to significant adverse impacts on patients’ mental health and quality of life. Disorders of urination are also a key feature of all neurological disorders.

A USC research team has now made major progress in understanding how the human spinal cord triggers the bladder emptying process. The discovery could lead to exciting new therapies to help patients regain control of this essential function.

In the pioneering study, a team from USC Viterbi School of Engineering and Keck School of Medicine of USC has harnessed functional ultrasound imaging to observe real-time changes in blood flow dynamics in the human spinal cord during bladder filling and emptying. The work was published in Nature Communications and was led by Charles Liu, the USC Neurorestoration Center director at Keck School of Medicine of USC and professor of biomedical engineering at USC Viterbi and Vasileios Christopoulos, assistant professor in the Alfred E. Mann Department of Biomedical Engineering. The study’s co-first authors are biomedical engineering postdoctoral scholar Kofi Agyeman and Darrin Lee, associate director of the USC Neurorestoration Center and also affiliated with biomedical engineering at USC. Another key contributor was Evgeniy Kreydin from the Rancho Los Amigos National Rehabilitation Center and the USC Institute of Urology.

The spinal cord regulates many essential human functions, including autonomic processes like bladder, bowel, and sexual function. These processes can break down when the spinal cord is damaged or degenerated due to injury, disease, stroke, or aging. However, the spinal cord’s small size and intricate bony enclosure have made it notoriously challenging to study directly in humans. Unlike in the brain, routine clinical care does not involve invasive electrodes and biopsies in the spinal cord due to the obvious risks of paralysis. Furthermore, fMRI imaging, which comprises most of human functional neuroimaging, does not exist in practical reality for the spinal cord, especially in the thoracic and lumbar regions where much of the critical function localizes.

“The spinal cord is a very undiscovered area,” Christopoulos said. “It’s very surprising to me because when I started doing neuroscience, everybody was talking about the brain. And Dr. Liu and I asked, ‘What about the spinal cord?’ For many, it was just a cable that transfers information from the brain to the peripheral system. The truth was that we didn’t know how to go there – how to study the spinal cord in action, visualize its dynamics and truly grasp its role in physiological functions.”

Functional Ultrasound Imaging: A New Window into the Spinal Cord

To overcome these barriers, the USC team employed functional ultrasound imaging (fUSI), an emerging neuroimaging technology that is minimally invasive. The fUSI process allowed the team to measure where changes in blood volume occur on the spinal cord during the cycle of urination.

However, fUSI requires a “window” through the bone to image the spinal cord. The researchers found a unique opportunity by working with a group of patients undergoing standard-of-care epidural spinal cord stimulation surgery for chronic low back pain.

“During the implantation of the spinal cord stimulator, the window we create in the bone through which we insert the leads gives us a perfect and safe opportunity to image the spinal cord using fUSI with no risk or discomfort to the study volunteers,” said Lee, who performed the surgeries. “While the surgical team was preparing the stimulator, we gently filled and emptied the bladder with saline to simulate a full urination cycle under anesthesia while the research team gathered the fUSI data,” added Kreydin, who was already working closely with Liu to study the brain of stroke patients during micturition using fMRI.

“This is the first study where we’ve shown that there are areas in the spinal cord where activity is correlated with the pressure inside the bladder,” Christopoulos said. “Nobody had ever shown a network in the spinal cord correlated with bladder pressure. What this means is I can look at the activity of your spinal cord in these specific areas and tell you your stage of the bladder cycle – how full your bladder is and whether you’re about to urinate”.

Christopoulos said the experiments identified that some spinal cord regions showed positive correlation, meaning their activity increased as bladder pressure rose, while others showed negative (anti-correlation), with activity decreasing as pressure increased. This suggests the involvement of both excitatory and inhibitory spinal cord networks in bladder control. “It was extremely exciting to take data straight from the fUSI scanner in the OR to the lab, where advanced data science techniques quickly revealed results that have never been seen before, even in animal models, let alone in humans,” Agyeman said.

New Hope for Patients

Liu has worked for two decades at the intersection of engineering and medicine to develop transformative strategies to restore function to the nervous system. Christopoulos has spent much of his research career developing neuromodulation techniques to help patients regain motor control. Together, they noted that for patients, retaining control of the autonomic processes that many of us take for granted is more fundamental than even walking.

“If you ask these patients, the most important function they wanted to restore was not their motor or sensory function. It was things like sexual function and bowel and bladder control,” Christopoulos said, noting that urinary dysfunction often leads to poor mental health. “It’s a very dehumanizing problem to deal with.”

Worse still, urinary incontinence leads to more frequent urinary tract infections (UTIs) because patients must often be fitted with a catheter. Due to limited sensory function, they may not be able to feel that they have an infection until it is more severe and has spread to the kidneys, resulting in hospitalization.

This study offers a tangible path toward addressing this critical need for patients suffering from neurogenic lower urinary tract dysfunction. The ability to decode bladder pressure from spinal cord activity provides proof-of-concept for developing personalized spinal cord interfaces that could warn patients about their bladder state, helping them regain control.

Currently, almost all neuromodulation strategies for disorders of micturition are focused on the lower urinary tract, largely because the neural basis of this critical process remains unclear. “One has to understand a process before one can rationally improve it,” Liu said. This latest research marks a significant step forward, opening new avenues for precision medicine interventions that combine invasive and noninvasive neuromodulation with pharmacological therapeutics to make neurorestoration of the genitourinary system a clinical reality for millions worldwide.

Reference:

Agyeman, K.A., Lee, D.J., Abedi, A. et al. Human spinal cord activation during filling and emptying of the bladder. Nat Commun 16, 6506 (2025). https://doi.org/10.1038/s41467-025-61470-1

Health Minister Dr Frank Anthony on Monday dismissed a claim by A Partnership for National Unity (APNU) that the Charles Roza School of Nursing in Linden has been shuttered. “They’re repeating this as if it is true but it is not true,” Dr Anthony told Demerara Waves Online News. “It’s just annoying. You go up ...

Their work includes major agency priorities such as HIV testing and monitoring, as well as work at the nation’s leading sexually transmitted infections lab. And while employees are back, many projects have been canceled or stalled, as funding disappears or is delayed.

“For a while, work was staring at a blank screen,” an HIV scientist said. “I had a couple of projects before this. I’m trying to get them restarted.”

“We don’t know what’s happening or what to do,” said an HIV prevention researcher who was fired then rehired.

These employees voiced deep concern over the future of the agency and its work on HIV and other threats. The unprecedented downsizing could lead to loss of life and higher spending on medical care, they say. Their uncertain employment status has sunk morale. Many worry about the future of public health.

On Aug. 8, a gunman identified by Georgia authorities as Patrick Joseph White fired shots at CDC buildings in Atlanta. A first responder on the scene, DeKalb County police officer David Rose, was killed. White, who was found dead, was possibly motivated by his views on vaccines, according to news reports.

The attack added another level of anxiety for agency workers.

“We feel threatened from inside, and, obviously, now from outside,” a lab scientist said Aug. 10. “The trauma runs so differently in all of us. And is this the last straw for some of us? The overall morale — would you go back in the building and you could be shot at?”

Healthbeat interviewed 11 CDC workers, who offered a rare glimpse into conditions at the agency. All but one had been fired then offered their jobs back. Most have worked on HIV-related projects for at least several years. All spoke on the condition of anonymity, citing a fear of retaliation.

They fear their employment, in the HIV scientist’s terms, “is on shaky ground.”

“I’m concerned there is chaos and that we lost ground on HIV prevention” from reductions in data collection and layoffs of local public health workers, an HIV epidemiologist said. “I feel like a pawn on a chessboard.”

HHS spokesperson Emily Hilliard responded to a query with this statement:

“Under Secretary Kennedy’s leadership, the nation’s critical public health functions remain intact and effective. The Trump administration is committed to protecting essential services — whether it’s supporting coal miners and firefighters through NIOSH, safeguarding public health through lead prevention, or researching and tracking the most prevalent communicable diseases. HHS is streamlining operations without compromising mission-critical work. Enhancing the health and well-being of all Americans remains our top priority.”

The workers received some positive news July 31, when a Senate committee voted to keep CDC funding at more than $9 billion, near its current level. “It is very encouraging, but that’s only one step in the appropriations process,” the HIV researcher said.

Still, under the Trump administration’s budget request, the CDC’s programs on HIV face uncertainty. John Brooks, who retired as chief medical officer of the CDC’s Division of HIV Prevention last year, expressed concern over the Ending the HIV Epidemic initiative. Launched in President Donald Trump’s first term, it “breathed new life into HIV prevention,” Brooks said.

The successes of the Ending the HIV Epidemic initiative are jeopardized by the administration plan to scale back HIV prevention efforts, Brooks said. That would include the potential elimination of the CDC Division of HIV Prevention, which provides funds to state health departments and other groups for testing and prevention, conducts HIV monitoring and surveillance, researches HIV prevention and care, and assists medical professionals with training and education.

“There is no way to achieve the goals of EHE without maintaining the national prevention infrastructure it depends on,” Brooks said. “There is every reason to worry that in fact new HIV infections will rise again.”

Under Secretary Robert F. Kennedy Jr., the Department of Health and Human Services carried out widespread layoffs at the CDC and other health agencies beginning in early April. Lawsuits over those mass firings are playing out in federal courts.

The administration’s budget blueprint would move CDC HIV work — with many fewer employees, according to people Healthbeat interviewed — to the Administration for a Healthy America, a new HHS division Kennedy has championed.

The Medical Monitoring Project, which tracks outcomes, quality, and gaps in HIV treatment, is set to be a casualty under the Trump restructuring plan, an HIV prevention physician said.

HHS officials have not communicated with the rank and file about the restructuring, several CDC workers said.

“It’s been crickets,” the HIV scientist said.

The White House’s proposed CDC budget for the next fiscal year contains a cut of more than 50%, plummeting from $9.2 billion in fiscal year 2025 to about $4.2 billion, according to administration documents and public health advocacy groups, with some agency functions transferred to the proposed AHA. The Senate committee, by an overwhelming vote, injected billions back into the agency budget and declined to fund the AHA.

U.S. Sen. Jon Ossoff, a Georgia Democrat, thanked the committee for “rejecting the unacceptable effort to defund most of the CDC.”

“The budget request from the White House included a 56% cut to the world’s preeminent epidemiological agency,” Ossoff said. He also criticized a “systematic destruction of morale at the CDC, the disbandment of entire agencies focused on maternal health and neonatal health and disease prevention at the CDC.”

If the White House prevails and the prevention program is eliminated, “we would see most states have no funding for HIV prevention,” said Emily Schreiber, senior director of policy and legislative affairs for the National Alliance of State and Territorial AIDS Directors. “That means most states would not be able to conduct any HIV testing, any referral to care, and/or referral to preventive services like PrEP,” or pre-exposure prophylaxis, a drug that can prevent HIV infections.

“It means that states would not be able to help people get access to medications,” she said, “and that means that we would see new cases and an increased spread of HIV across the United States.”

“We would definitely see layoffs at the CDC, and I think we’d probably see them at state health departments and community-based organizations as well,” she added.

The Los Angeles County Department of Public Health has recently laid off or reassigned dozens of HIV workers due to funding problems, according to a statement emailed to Healthbeat.

“I fear all HIV prevention work will go away permanently,” the HIV prevention researcher said. “I don’t think this administration wants HIV prevention work to be done by the federal government.”

Georgia leads U.S. states in the rate of new HIV infections, according to the latest data from AIDSVu. CDC workers also said they’re concerned that vulnerable communities of color and LGBTQ+ communities would be deeply harmed by funding cuts.

In Georgia and other states, information provided by the Medical Monitoring Project about access to care will disappear, the HIV physician said. Information on prevention and treatment will dwindle for people who are disadvantaged, he said, including those with substance abuse problems or mental illness, transgender people, and those living in poverty.

“There is a lot of anger and sadness among people over the termination of the project,” the physician said. “A lot of the enthusiasm is gone.”

An effective home testing program for HIV plans to shutter this fall, said Patrick Sullivan, the Together TakeMeHome project’s lead scientist and a professor at Emory University’s Rollins School of Public Health. In its notice canceling funding for the project, the CDC said it no longer had the staff to oversee it. Based at Emory, the project delivered more than 900,000 free home testing kits to people across the country through an easy-to-use website and integration with dating apps.

More than 100 HIV workers were among the more than 450 CDC staffers brought back, said employees interviewed by Healthbeat. Some cited media coverage, support in Congress, and advocacy by patient groups and pharmaceutical companies for their reinstatement. “Members of Congress are going to bat for HIV,” the epidemiologist said.

Several are closely watching a lawsuit brought by 20 Democratic attorneys general, seeking to halt an agency restructuring plan Kennedy announced in March. They are also paying attention to a lawsuit filed in California that challenges the firings.

A few people whose jobs were restored have retired or moved on to other work. “Some people aren’t trusting we will remain, so they’re leaving,” the HIV prevention researcher said.

At the CDC’s sexually transmitted infections lab in Atlanta, work has also slowed due to a shrinking staff and new spending constraints on supplies, the lab scientist said.

Restored lab workers are focusing on high-priority areas such as syphilis and gonorrhea while other diseases have been back-burnered, the scientist said, adding “a lot of what we were doing was staying ahead of the next pathogen, and we feel like our time and effort to do that now is limited.”

“We’re all public health because we know what the mission is,” the scientist said. “We just want to get our job done and protect the American public.”

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Presidential candidate for A Partnership for National Unity (APNU), Aubrey Norton on Sunday assured residents of Linden that the electricity subsidy would not be scrapped. “We saying to you that wouldn’t happen under us. We want to see Linden progress,” he told about 2,000 attendees at a campaign rally held outside the old Palm Tree ...