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The Bio Report

Reprogramming T Cells to Cross the Brain’s Border

38 min episode · 2 min read
·
Michael Roberts

Episode

38 min

Read time

2 min

Topics

Productivity, Leadership, Design & UX

AI-Generated Summary

Key Takeaways

  • Blood-Brain Barrier Delivery Gap: Current BBB-crossing strategies — including focused ultrasound with microbubbles, receptor-mediated transcytosis, and convection-enhanced delivery — all carry significant limitations: invasiveness, localized effect only, or uncontrolled permeability. None adequately address glioblastoma's diffuse infiltration pattern, where tumor tentacles extend far beyond the visible mass seen on imaging.
  • BRITE Platform Mechanism: Adaptin isolates patient T cells via standard leukapheresis, manipulates them without genetic engineering to express BBB-crossing receptors, then links bispecific T cell engagers to those cells. This dual-component system increases large protein delivery into the brain by more than sevenfold over baseline, as demonstrated in preclinical studies.
  • APTN-101 Tumor Specificity: The lead program targets EGFRvIII, an antigen expressed exclusively on tumor cells and absent from normal tissue, paired with a CD3-binding arm that activates T cells on contact. In glioblastoma mouse models with implanted tumors behind the BBB, the therapy produced long-term survival in 70–80% of animals with minimal off-target toxicity signals.
  • Scalable, Low-Cost Manufacturing: Because T cells are manipulated rather than genetically engineered, Adaptin avoids the cost of viral vectors required for CAR-T production. A single leukapheresis expansion can yield tens to hundreds of potential doses. The bispecific engager component is manufactured separately at a third-party CMO, keeping overall production costs lower and timelines shorter.
  • Pipeline Adaptability for Tumor Escape: Glioblastoma cells alter antigen expression under therapeutic pressure, a primary reason single-target therapies fail. Adaptin's platform is designed to swap targeting components as tumors evolve — APTN-102 addresses a secondary tumor antigen — enabling sequential or combination targeting that tracks tumor changes rather than treating a static molecular profile.

What It Covers

Adaptin Bio CEO Michael Roberts explains how the company's BRITE platform uses patient-derived T cells as delivery vehicles to transport bispecific therapeutic payloads across the blood-brain barrier, with lead program APTN-101 targeting glioblastoma and a Phase 1 trial planned for early 2026.

Key Questions Answered

  • Blood-Brain Barrier Delivery Gap: Current BBB-crossing strategies — including focused ultrasound with microbubbles, receptor-mediated transcytosis, and convection-enhanced delivery — all carry significant limitations: invasiveness, localized effect only, or uncontrolled permeability. None adequately address glioblastoma's diffuse infiltration pattern, where tumor tentacles extend far beyond the visible mass seen on imaging.
  • BRITE Platform Mechanism: Adaptin isolates patient T cells via standard leukapheresis, manipulates them without genetic engineering to express BBB-crossing receptors, then links bispecific T cell engagers to those cells. This dual-component system increases large protein delivery into the brain by more than sevenfold over baseline, as demonstrated in preclinical studies.
  • APTN-101 Tumor Specificity: The lead program targets EGFRvIII, an antigen expressed exclusively on tumor cells and absent from normal tissue, paired with a CD3-binding arm that activates T cells on contact. In glioblastoma mouse models with implanted tumors behind the BBB, the therapy produced long-term survival in 70–80% of animals with minimal off-target toxicity signals.
  • Scalable, Low-Cost Manufacturing: Because T cells are manipulated rather than genetically engineered, Adaptin avoids the cost of viral vectors required for CAR-T production. A single leukapheresis expansion can yield tens to hundreds of potential doses. The bispecific engager component is manufactured separately at a third-party CMO, keeping overall production costs lower and timelines shorter.
  • Pipeline Adaptability for Tumor Escape: Glioblastoma cells alter antigen expression under therapeutic pressure, a primary reason single-target therapies fail. Adaptin's platform is designed to swap targeting components as tumors evolve — APTN-102 addresses a secondary tumor antigen — enabling sequential or combination targeting that tracks tumor changes rather than treating a static molecular profile.

Notable Moment

Roberts describes glioblastoma's diffuse infiltration by asking listeners to spread their fingers: the palm represents the visible tumor mass on imaging, while the fingers represent invisible tumor tentacles extending into surrounding brain tissue — the portion no surgical resection or localized drug delivery can reliably reach.

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Episode Transcript

I'm Daniel Levine, and this is the Bio Report. One of the challenges of treating brain tumors is delivering potent biologic therapies across the blood brain barrier. Adaptin Bio has developed platform technology that harnesses a patient's own T cells to transport bispecific therapeutic payloads across the blood brain barrier and into other targeted tissue with an initial focus on treating glioblastoma. We spoke to Michael Roberts, co founder and CEO of Adaptin Bio, about the unmet need in glioblastoma, the limitations of current blood brain barrier crossing strategies, and how the company's platform seeks to change the treatment paradigm by using patient derived T cells as delivery vehicles for targeted biologics. Michael, thanks for joining us. It's a pleasure to be here, Danny. We're gonna talk about difficult to treat brain tumors, Adaptin Bio, and its platform technology for developing therapies across the blood brain barrier. Let's start with glioblastoma. What is it? Glioblastoma, it's often called, glioblastoma multiforme or GBM for short. And it's a grade four astrocytoma, which means it's the highest stage of malignancy, meaning that it's by the time you're already diagnosed, it's well advanced. So it is the most aggressive in, of of the primary brain tumors in adults, and it's, characterized by a couple of things. First, it's rapid growth. Right? So once it's diagnosed, we're talking rapid growth within months. It has, what's called diffuse infiltration, which means that it goes into the surrounding brain tissue. I like to, you know, tell people that if they just put their hand up and they spread their fingers, what you what the physician sees on the radiographic image is basically the palm of your hand. That's what they can see. The fingers represent tentacles of tumor cells that go into the rest of the brain that they don't see. Right? So it has this diffuse infiltration. And then, of course, I think one of the most important things here is is is has a marked genetic and cellular heterogeneity, meaning that not all cells in the tumor are alike. They have very different behaviors. They have different, signatures. So when you treat, the brain tumor, it's, with a single entity, it's not it's gonna escape. It's not gonna be effective. K? So it you know, one thing I can tell about, glioblastoma is that it is relentless. Right? So it quickly develops, by the pay by the time the patient gets to the physician, and typically some of the symptoms of of of the patients are, you know, persistent and worsening headaches. They get seizures, which is often the first, thing because, again, if you have headaches all the time, that may not be a brain tumor. But when you have a seizure, that usually tells you that there's something else involved. And then, of course, you know, family, friends, they may see cognitive or personality changes in you. And then there's these things called focal neurological episodes. And these are things like weaknesses …

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