documentclass{article}
usepackage[utf8]{inputenc}
setlengthparindent{0pt}
%=========================================================================================================================================
% PACKAGES REQUIRED FOR GLOSSARIES
%=========================================================================================================================================

% Glossaries must be loaded before amsmath as per details in the following forum answer
% http://tex.stackexchange.com/questions/85696/what-causes-this-strange-interaction-between--and-amsmath
usepackage[nogroupskip,toc,acronym]{glossaries} % must come after href
usepackage{scrwfile}%http://www.dickimaw-books.com/cgi-bin/faq.cgi?action=view&categorylabel=glossaries#glsnewwriteexceeded
usepackage{siunitx,microtype,textcomp,textgreek}
makeglossaries

newglossaryentry{TNF}{
    type={acronym},
    sort={tumor necrosis factor},
    name={TNF},
    short={TNF},
    long={tumor necrosis factor},
    first={tumor necrosis factor (TNF)},
    description={tumor necrosis factor}
}

begin{document}
    begin{itemize}
        item gls{TNF}
    end{itemize}
end{document}