Nicotinic acid or isonicotinic acid compound and use thereof

A compound of Formula I, or a pharmaceutically acceptable salt, ester, solvate thereof,

• in the Formula I,
• R1 and R2 independently represent any one of the groups selecting from the group consisting of hydrogen and —(CH2)mCOOH;
• R3, R4, R5, R6 and R7 independently represent any one of the groups selecting from the group consisting of hydrogen, hydroxyl, amino, halogen, lower alkyl, lower alkoxy, and lower cycloalkyl;
• the lower alkyl refers to a linear or branched saturated aliphatic group having 1 to 6 carbon atoms;
• the lower alkoxy refers to a linear or branched alkoxy group having 1 to 6 carbon atoms;
• the lower cycloalkyl refers to a ring group having 3 to 7 carbon atoms;
• X independently represents any one of the groups selecting from the group consisting of O, —S═O and —SO2;
• m is 0, or 1, or 2, or 3.