Synthesis and Biological Activity Assessment of Different Diastereomers in siRNA Drug LEQVIO (Inclisiran) (U01) Clinical Trial Not Allowed

The purpose of this research is to systematically evaluate the diastereomeric composition of LEQVIO (Inclisiran), an FDA-approved, N-acetylgalactosamine (GalNAc)-conjugated siRNA drug, and to understand the biological/pharmacological activity of each diastereomer in LEQVIO through stereochemically-controlled

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synthesis and biological activity assessment using in vitro and animal models.

The proposed studies will focus on 1) synthesis of each diastereomer of LEQVIO (Inclisiran) in stereochemically pure form; 2) assessment of the biological activity of each stereochemically pure diastereomer in inhibiting PCSK9 activity using in vitro assays and in a transgenic mouse model; 3) development of analytical methods to identify and characterize the stereochemical structure of each diastereomer in LEQVIO; and 4) assessment of the individual contribution of each diastereomer to the overall pharmacological activity of LEQVIO.

Tools developed in this research can also be applied to other similar GalNAc-conjugated siRNAs specifically, and other siRNAs in general.

Knowledge gained from this research will also contribute to the sameness evaluation of generic siRNAs, and to the quality control of oligonucleotide drugs.
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Food and Drug Administration_Research

Department of Health and Human Services

Agency: Department of Health and Human Services

Office: Food and Drug Administration

Estimated Funding: $1,200,000

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Eligible OrganizationsHigher Education InstitutionsPublic/State Controlled Institutions of Higher EducationPrivate Institutions of Higher EducationThe following types of Higher Education Institutions are always encouraged to apply for FDA support as Public or Private Institutions of Higher Education:Hispanic-serving InstitutionsHistorically Black Colleges and Universities (HBCUs)Tribally Controlled Colleges and Universities (TCCUs)Alaska Native and Native Hawaiian Serving InstitutionsAsian American Native American Pacific Islander Serving Institutions (AANAPISIs)Nonprofits Other Than Institutions of Higher EducationNonprofits with 501(c)(3) IRS Status (Other than Institutions of Higher Education)Nonprofits without 501(c)(3) IRS Status (Other than Institutions of Higher Education)For-Profit OrganizationsSmall BusinessesFor-Profit Organizations (Other than Small Businesses)Local GovernmentsState GovernmentsCounty GovernmentsCity or Township GovernmentsSpecial District GovernmentsIndian/Native American Tribal Governments (Federally Recognized)Indian/Native American Tribal Governments (Other than Federally Recognized)U. S. Territory or PossessionOtherIndependent School DistrictsPublic Housing Authorities/Indian Housing AuthoritiesNative American Tribal Organizations (other than Federally recognized tribal governments)Faith-based or Community-based OrganizationsRegional OrganizationsNon-domestic (non-U.S.) Entities (Foreign Institutions)

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