B1 receptor

Alpha-9 Oncology has raised $175m in a Series C funding round to advance its pipeline of radiopharmaceuticals. Credit: eamesBot via Shutterstock. Alpha-9 Oncology is the latest radiopharma to raise funds, drawing in $175m in Series C financing, to advance its radiopharmaceutical candidates through clinical trials and expand its research and development (R&D) capabilities. Vancouver, Canada-based Alpha-9 shared that it will advance its pipeline of preclinical candidates to the “clinic-ready” stage. While the company has not disclosed which of its assets in particular will be advanced, the company has several preclinical programs targeting MC1R, PSMA, GRPR, CXCR4, and B1R, as per GlobalData’s Pharma Intelligence Center. In May 2024, Alpha-9 announced the dosing of the first patient in its Phase I study for the MC1R programme, dubbed A9-3202. This peptide-based radiopharmaceutical targets the melanocortin 1 receptor for imaging locally advanced or metastatic melanoma. The trial is evaluating A9-3202’s tumour uptake and distribution in normal tissue among participants with melanoma. This latest financing comes after a flood of investment into the radiopharma arena over the last few years. Earlier this month, Aktis Oncology raised $175m to support the development of its new radiopharmaceuticals, including a first-in-class Nectin-4-targeted miniprotein radioconjugate. Big pharma has jumped on the radiopharma train too, with Bristol Myers Squibb (BMS), Novartis , and Eli Lilly signing acquisition deals worth $4.2bn , $1.75bn , and $1.4bn, respectively. Alpha-9’s Series C – co-led by Lightspeed Venture Partners and Ascenta Capital – builds on a $75m Series B in December 2022, and a $8.9m Series A in 2021, three years after the company spun-out from the University of British Columbia. Other participating investors in this round included a16z Bio + Health, RA Capital Management, Janus Henderson Investors and Samsara BioCapital. See Also: UPFs fuelling ‘alarming rise of chronic diseases’ in india FDA grants ODD to Modalis’ MDL-101 to treat LAMA2-CMD Alpha-9 said its funding will also support ongoing investments in its discovery capabilities, as well as the expansion of manufacturing and isotope supply partnerships. The company recently completed the construction of a manufacturing facility in Vancouver, Canada. Last month, Telix Pharmaceuticals paid $230m upfront to acquire US-based radioisotope manufacturer RLS Radiopharmacies to expand its manufacturing footprint in the US. Venture financing for innovative radiopharmaceutical drugs has witnessed an approximately 550% increase from $63m in 2017 to $408m in 2023 YTD (year-to-date) total deal value in the US, according to GlobalData’s Pharma Intelligence Center Deals Database. GlobalData is the parent company of Pharmaceutical Technology. In the announcement accompanying the financing, Alpha-9’s CEO David Hirsch said: “Over the last few years, Alpha-9 has built a leading radiopharmaceutical company with a deep pipeline and robust infrastructure.”

Another private radiopharmaceutical biotech has raised big money. Alpha-9 Oncology revealed on Wednesday that it’s put together a $175 million Series C, aiming to fund clinical trials for programs that are ready to be tested in humans and to advance preclinical candidates to the “clinic-ready” stage. The raise highlights the continuation of a strong interest in radiopharmaceuticals from large pharma companies, startups and venture capital. Alpha-9’s $175 million raise matches a Series B by Aktis Oncology last month, with multiple firms contributing to both rounds. It’s not immediately clear which of Alpha-9’s programs are expected to enter the clinic with the new fundraise. Execs previously told Endpoints News in 2022 that the company had five programs going after the cancer targets PSMA, MC1R, CXCR4, B1R and GRPR, with the PSMA program furthest along. But this past May, Alpha-9 announced the first patient had been dosed in a Phase 1 study for the MC1R program, called A9-3202. That trial is researching the compound’s effect in locally advanced or metastatic melanoma. Alpha-9 hasn’t previously announced any other trial launches, and a company spokesperson would only say that “multiple programs” have entered the clinic since the Series B. Wednesday’s financing was co-led by Lightspeed Venture Partners and Ascenta Capital. Other participating investors included a16z Bio + Health, RA Capital Management, Janus Henderson Investors and Samsara BioCapital.

Have you ever wondered how drugs reach their targets and achieve their function within our bodies? If a drug molecule or a ligand is a message, an inbox is typically a receptor in the cell membrane. One such receptor involved in relaying molecular signals is a G protein-coupled receptor (GPCR). About one-third of existing drugs work by controlling the activation of this protein. Researchers now reveal a new way of activating GPCR by triggering shape changes in the intracellular region of the receptor. This new process can help researchers design drugs with fewer or no side effects. Have you ever wondered how drugs reach their targets and achieve their function within our bodies? If a drug molecule or a ligand is a message, an inbox is typically a receptor in the cell membrane. One such receptor involved in relaying molecular signals is a G protein-coupled receptor (GPCR). About one-third of existing drugs work by controlling the activation of this protein. Japanese researchers now reveal a new way of activating GPCR by triggering shape changes in the intracellular region of the receptor. This new process can help researchers design drugs with fewer or no side effects. If the cell membrane is like an Oreo cookie sandwich, GPCR is like a snake with seven segments traversing in and out of the cookie sandwich surface. The extracellular loops are the inbox for messages. When a message molecule binds to the extracellular side of the receptor, it triggers a shape change activating G proteins and the ß-arrestin protein attached to the intracellular side of the receptor. Like a molecular relay, the information passes downstream and affects various bodily processes. That is how we see, smell, and taste, which are sensations of light, smell, and taste messages. Adverse side effects ensue if drugs acting on GPCRs activate multiple signaling pathways rather than a specific target pathway. That is why drug development focuses on activating specific molecular signal pathways within cells. Activating the GPCR from inside the cell rather than outside the cell could be one way to achieve specificity. But until now, there was no evidence of direct activation of only the intracellular side of GPCRs without the initiations from the extracellular side. A team of researchers headed by Osamu Nureki, a professor at the University of Tokyo, and his lab, discovered a new receptor activation mode of a bone metabolism-related GPCR called human parathyroid hormone type 1 receptor (PTH1R) without signal transduction from the extracellular side. "Understanding the molecular mechanism will enable us to design optimal drugs," says Kazuhiro Kobayashi, a doctoral student and an author of the study. Such a drug offers "a promising treatment for osteoporosis." Kobayashi has been conducting research on bone formation in animal models since he was an undergrad. "Treatments for osteoporosis that target PTH1R require strict dosage, have administrative restrictions, and there aren't yet any better alternatives," he says. That motivated their team to look for better drug design strategies targeting the parathyroid hormone receptor. To understand function through structure, they used cryo-electron microscopy and revealed the 3D structure of the PTH1R and G protein bound to a message molecule. The team synthesized a non-peptide message molecule called PCO371 which binds to the intracellular region of the receptor and interacts directly with G protein subunits. In other words, PCO371 activates the receptor after entering the cell. The PCO371-bound PTH1R structure can directly and stably modulate the intracellular side of PTH1R. And because PCO371 activates only G protein and not ß-arrestin it does not cause side effects. This specificity of its binding and receptor activation mode makes it a suitable candidate for potential small-molecule-based drugs for class B1 GPCRs, like PTH1R, which currently lack oral administrative drug ligands. Such drugs would have reduced adverse effects and burdens on patients as they act on specific molecular pathways. The findings from this study will help "develop new drugs for disorders such as obesity, pain, osteoporosis, and neurological disorders." The study appears in the journal Nature.