Mucosis announces publication of data demonstrating safety and protection by mucosally administered Mimopath®-based prefusion-like F RSV vaccines

Groningen, the Netherlands, Aug 12, 2013 – Biotechnology company Mucosis B.V. today announced the publication in the peer-reviewed journal PLOS ONE of preclinical data showing that its innovative SynGEM® is safe and protective in animal models. According to the report, SynGEM®, a vaccine based on the Mimopath® vaccine technology allows presentation of a stable prefusion-like trimeric F protein, a feature considered important for the induction of functional immunity. Intranasally administrated SynGEM® induced locally secreted IgA in the mucosal layers in addition to robust levels of systemic virus neutralizing antibodies both in mice and cotton rats.
The response upon vaccination was fully protective in both animal models while no “enhanced disease” symptoms were induced, which were clearly observed with the formalin-inactivated RSV vaccine that failed in clinical trials in the 1960s. The preclinical results follow recent developments in RSV vaccine research that revealed a newly identified site of vulnerability which is only exposed in the prefusion F protein, named antigenic site φ. This pivotal antigenic site is an essential epitope required for effective induction of highly potent neutralizing antibodies in humans.
Dr. Kees Leenhouts, CSO of Mucosis: “Together with our partner at the University of Utrecht, a team led by Prof. Peter Rottier and Dr. Xander de Haan, we have succeeded in producing stable prefusion-like F antigen and formulating a vaccine candidate, SynGEM® that presents the prefusion F epitopes of antigenic site φ in a safe way to the immune system. In addition, our vaccine presents the protective epitope recognized by palivizumab. The intranasal application potentially results in an extra line of defense at the port of entry of the virus, which may also reduce virus shedding and hence may increase “herd” immunity. The vaccine candidate is therefore uniquely positioned to fill the gap of substantial unmet medical need by preventing RSV infections in people of all ages including those with the highest morbidity and mortality rates in the very young and elderly. Additionally, the non-invasive character of the vaccine candidate and the Generally Recognized as Safe (GRAS) nature of the core Mimopath® vaccine technology may lead to a greater acceptance of maternal vaccination strategies in order to protect premature newborns and infants through placental and/or breast milk transfer of antibodies”.
“These positive animal data showing safe and effective protection against RSV provide further confirmation that the Mimopath® vaccine platform will play a key role in meeting significant unmet medical need around the globe,” added Thomas S Johnston, Chief Executive Officer. “We remain focused on advancing the SynGEM® program into human trials, as we believe its unique prefusion-like structure offers the most complete approach to generating a meaningful immune response and thereby conferring protection in those that need it the most.”
Mucosis is focused on the development the SynGEM® vaccine candidate in cooperation with its corporate,
governmental and non-governmental partners. SynGEM® is designed to prevent infections with
Respiratory Syncytial Virus (RSV), which affect over 60 million people worldwide ranging from the very
young to the elderly with more than one million hospitalizations annually. An RSV vaccine does not yet
For further information please contact:
Thomas Johnston
CEO Mucosis
+31 (50) 8200050

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