Treatment of late stage disease in a model of arenaviral hemorrhagic fever: T-705 efficacy and reduced toxicity suggests an alternative to ribavirin.
A growing number of arenaviruses are known to cause viral hemorrhagic fever (HF), a severe and life-threatening syndrome characterized by fever, malaise, and increased vascular permeability. Ribavirin, the only licensed antiviral indicated for the treatment of certain arenaviral HFs, has had mixed success and significant toxicity. Since severe arenaviral infections initially do not present with distinguishing symptoms and are difficult to clinically diagnose at early stages, it is of utmost importance to identify antiviral therapies effective at later stages of infection. We have previously reported that T-705, a substituted pyrazine derivative currently under development as an anti-influenza drug, is highly active in hamsters infected with Pichinde virus when the drug is administered orally early during the course of infection. Here we demonstrate that T-705 offers significant protection against this lethal arenaviral infection in hamsters when treatment is begun after the animals are ill and the day before the animals begin to succumb to disease. Importantly, this coincides with the time when peak viral loads are present in most organs and considerable tissue damage is evident. We also show that T-705 is as effective as, and less toxic than, ribavirin, as infected T-705-treated hamsters on average maintain their weight better and recover more rapidly than animals treated with ribavirin. Further, there was no added benefit to combination therapy with T-705 and ribavirin. Finally, pharmacokinetic data indicate that plasma T-705 levels following oral administration are markedly reduced during the latter stages of disease, and may contribute to the reduced efficacy seen when treatment is withheld until day 7 of infection. Our findings support further pre-clinical development of T-705 for the treatment of severe arenaviral infections.
Gowen
Brian B
BB
Institute for Antiviral Research, Logan, UT, USA. brian.gowen@usu.edu
Smee
Donald F
DF
Wong
Min-Hui
MH
Hall
Jeffery O
JO
Jung
Kie-Hoon
KH
Bailey
Kevin W
KW
Stevens
John R
JR
Furuta
Yousuke
Y
Morrey
John D
JD
D000042:Absorption / Q000187:drug effects; D000284:Administration, Oral; D000410:Alanine Transaminase / Q000097:blood; D000577:Amides / Q000008:administration & dosage / Q000097:blood / Q000627:therapeutic use* / Q000633:toxicity*; D000818:Animals; D001117:Arenaviridae Infections / Q000150:complications / Q000188:drug therapy* / Q000473:pathology / Q000821:virology; D001219:Aspartate Aminotransferases / Q000097:blood; D006224:Cricetinae; D004195:Disease Models, Animal; D018450:Disease Progression; D005260:Female; D006482:Hemorrhagic Fevers, Viral / Q000150:complications / Q000188:drug therapy* / Q000473:pathology / Q000821:virology; D007370:Interferon Type I / Q000097:blood; D008107:Liver Diseases / Q000150:complications / Q000473:pathology / Q000821:virology; D008647:Mesocricetus; D018052:Pichinde virus / Q000187:drug effects; D011719:Pyrazines / Q000008:administration & dosage / Q000097:blood / Q000627:therapeutic use* / Q000633:toxicity*; D012254:Ribavirin / Q000008:administration & dosage / Q000627:therapeutic use*; D016019:Survival Analysis; D016896:Treatment Outcome; D019562:Viral Load
D000577:Amides; D007370:Interferon Type I; D011719:Pyrazines; D012254:Ribavirin; D001219:Aspartate Aminotransferases; D000410:Alanine Transaminase; C462182:favipiravir