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| | | | Filings under Rule 425 under the Securities Act of 1933 and deemed filed under Rule14a-6 of the Securities Exchange Act of 1934, as amended Filing by: Conatus Pharmaceuticals Inc. Subject Company: Conatus Pharmaceuticals Inc. SEC File No.:001- 36003 |
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| | | | CONTACT:Keith Marshall Conatus Pharmaceuticals Inc. (858)376-2600 IR@conatuspharma.com |
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| | | | CONTACT:Eileen Brandt Histogen Inc. (858)526-3106 ebrandt@histogen.com |
Histogen Publishes Preclinical Data on its HST 004 Spinal Disc Program
SAN DIEGO, May 14, 2020 – Histogen Inc., a regenerative medicine company with a novel biological platform that replaces and regenerates tissues in the body, announced today the publication of data on HST 004, its patented, naturally-derived material for spinal disc repair in the Journal of Medicine and Surgical Sciences.
Histogen has developed a cell conditioned media (CCM) that is embryonic-like in composition and that has been shown to stimulate stem cells in vivo. The material expresses stem cell-associated proteins, including nodal, brachyury, nestin and Oct4, and has the potential to reduce inflammation and stimulate autologous intravertebral disc (IVD) cells, which can lead to the repair of IVD matrix.
In a spinal disc study, HST 004 reversed inflammation and protease activity and stimulated aggrecan secretion in the thrombin-induced rabbit ex vivo model. In vivo studies in the rabbit degenerative disc model showed that, in as little as 4 weeks post treatment with HST 004, disc height increased as compared to the control. MRI analysis demonstrated regeneration of the disc tissue (Pfirrmann grading analysis p<0.05).
“Disc degeneration due to traumatic injury is associated with inflammation and breakdown of the disc tissue,” said Dr. Gail K. Naughton, Founder and Chief Scientific Officer of Histogen. “We are very excited that studies with HST 004 demonstrated a significant and rapid reduction in inflammation and degradation markers, and a stimulation of disc cells to produce new matrix. The in vivo model results support the regeneration of the disc to apre-damaged state.”
Pain associated with degenerative disc disease or spinal disc injury affects 21 million patients in the U.S. With surgical intervention considered a last resort and utilized in only 5% of cases, a minimally invasive treatment that helps to restore cartilage and reduce inflammation could fill a significant unmet need.
“We are encouraged by this data on HST 004 and we look forward to generating additionalpre-clinical data later this year in anticipation of filing an investigational new drug application on spinal disc repair in 2021,” said Richard Pascoe, Chairman and CEO of Histogen.
The research paper entitled “A Novel Bioengineered Material to Reverse Intervertebral Disc Degeneration” has been published in Volume 2, Issue 1 of Journal of Medicine and Surgical Sciences, and is currently available electronically athttps://escientificpublishers.com/a-novel-bioengineered-material-to-reverse-intervertebral-disc-degeneration-JMSS-02-0018.
Histogen’s Planned Merger with Conatus Pharmaceuticals
On January 28, 2020, Histogen announced that it entered into a definitive agreement with Conatus Pharmaceuticals Inc. (Nasdaq: CNAT) pursuant to which Histogen will merge with and into a wholly-