Tired of the Swine Flu? Check Out the Coxsackie Virus

On several occasions while driving in upstate New York, I noticed an exit sign on the NY State Thruway for Coxsackie, NY. And, not surprisingly, I began to wonder whether or not the Coxsackie virus was named after this obscure upstate NY town.

I first learned about coxsackie viruses as a graduate student while taking a medical virology course at the University of Wisconsin taught by the late noble laureate Howard Temin. However, despite a thirty year friendship with Vincent Racaniello, a BioCrowd co-founder and virologist extraordinaire, I never asked him about the origin of the coxsackie virus name. Much to my surprise, he had recently taken a trip to upstate NY and noticed the Coxsackie NY exit sign while driving on the thruway. This prompted him to blog about the coxsackie virus isolation, its pathogenic properties and of course, the origin of its name!

Coxsackie NY and the virus named after it 

by Vincent Racaniello,PhD

Recently while driving north on the New York State Thruway I passed the exit for the town of Coxsackie, NY (population 8,884). I grabbed my camera and photographed the exit sign, and reminded myself to write about the virus named after this small town.

In the summer of 1947 there were several small outbreaks of poliomyelitis in upstate New York. Gilbert Dalldorf, the director of the Wadsworth Laboratory in Albany, NY, and his associate Grace M. Sickles investigated this outbreak. In particular they sought polioviruses that could replicate in mice. This search was motivated by the fact that research on poliovirus required the use of monkeys which were extremely expensive. Dalldorf had attended the Fourth International Congress for Microbiology in 1947 where he heard that very young mice – suckling mice – could readily be infected with Theiler’s virus.

Dalldorf and Sickles made fecal suspensions from two children suspected of having poliomyelitis, and inoculated these into adult and suckling mice. Only the suckling mice (1 – 7 days old) developed paralysis; animals more than one week old were resistant to infection. The damage responsible for limb paralysis was widespread lesions in skeletal muscles, not in the central nervous system as occurs with poliovirus. Further study revealed that the viruses could be distinguished serologically from poliovirus.

Not only had Dalldorf and Sickles identified the first members of a very large group of human viruses, but they also introduced and popularized a new and inexpensive animal into the virology laboratory – the suckling mouse. In 1949 Dalldorf suggested that the new viruses be called Coxsackie viruses, because the first recognized human cases were residents of that New York village. This unique name is of native North American origin.

Over ten years later the importance of this work was recognized by Dr. Max Finland of Boston City Hospital:

The isolation by Dalldorf and Sickles of viruses which produced paralysis with destructive lesions of muscle in sucking mice and hamsters, from the stools of two children with signs of paralytic poliomyelitis was an achievement that may rank in importance with Landsteiner and Popper’s production of human poliomyelitis in monkeys.

In subsequent years many different Coxsackie viruses were isolated that cause a variety of clinical syndromes. Today at least 30 serotypes of Coxsackie viruses are classified in the enterovirus genus of the Picornaviridae. The viruses are classified into groups A or B depending upon the pathological effect in suckling mice.

Not every locale is pleased to have a virus named after it. In May 1993, an outbreak of an unexplained pulmonary illness occurred in the southwestern United States, in an area shared by Arizona, New Mexico, Colorado and Utah called “The Four Corners.” Muerto Canyon was proposed as the name for the etiologic agent of the disease, because the virus was first isolated from a rodent near the canyon. However after residents objected, the name Sin nombre virus was given to the agent of hantavirus pulmonary syndrome.

Dalldorf G, & Sickles GM (1948). An Unidentified, Filtrable Agent Isolated From the Feces of Children With Paralysis. Science (New York, N.Y.), 108 (2794), 61-62 PMID: 17777513

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Is an effective treatment for the common cold at hand?

The sequence of all known rhinovirus genomes reported in Science last week is an important advance for the field. Analyses of the sequences have revealed new relationships among the viruses, evidence for recombination, a new viral species, and conserved regions of the genome. These findings will be extremely valuable for those studying the biology, pathogenesis, and epidemiology of the common cold. But the press has over reacted to this work -  it was reported on the front page of the New York Times with the headline “Cure for the Common Cold? Not Yet, but Possible“.  Does the work deserve such fanfare?

The Times quoted Stephen Liggett, an asthma expert, as saying “We are now quite certain that we see the Achilles’ heel, and that a very effective treatment for the common cold is at hand.” He was apparently referring to the observation that a sequence within the 5′-noncoding region of the viral genome is highly conserved among the 99 rhinovirus sequences, in comparison with other regions of the viral RNA. He suggested that all 99 rhinovirus serotypes would therefore be susceptible to the same drug. But what kind of drug, and what function would it inhibit? The very 5′-end of the genome of enteroviruses and rhinoviruses binds viral and cellular proteins, and these interactions are essential for viral replication. So it might be possible to identify small molecules that block these protein-RNA interactions. But such drugs are very difficult to identify. Furthermore, if such a drug were identified, its efficacy would have to be tested against all rhinovirus serotypes. Therefore it is not clear that knowing that this sequence of the genome is conserved helps to identify drug targets and more readily than did the observations made years ago about the importance of RNA-protein interactions in this region. Clearly, many years of research are needed before such drugs are developed - not consistent with Dr. Liggett’s a treatment is ‘at hand’.

An even more crucial aspect of the problem was omitted from the Times article. Even if an antiviral drug could be identified that blocks essential RNA-protein interactions, it probably would not be useful in treating the common cold. As we discussed last week, rhinoviruses cause acute infections - characterized by rapid onset of disease, a relatively brief period of symptoms, and resolution within days. Most are complete by the time the patient feels ill, and the virus has already spread to another host. Antiviral therapy  must be given early in infection to be effective. There is little hope of treating most acute viral infections with antiviral drugs until rapid diagnostic tests are become available.

 

 

To be fair, some of the scientists quoted in the Times article were more realistic about the possibilities for rhinovirus treatments. One antiviral drug expert noted that it costs about $700 million to bring a drug to market. Because most rhinovirus infections are benign, who would pay for such an expensive drug, and would the Food and Drug Administration ever approve it? Ann Palmenberg, the lead author on the study, was even more realistic, admitting that a rhinovirus vaccine would not likely be made.

I cannot see how this new study identified a new or better target for therapeutic intervention. So why get the public excited by running a front page headline in the New York Times? It’s great to keep the public informed about scientific progress - but the press should not cry wolf. If this advance does not soon lead to a treatment for the common cold, the public will shake their heads and lose a bit more trust in science.

I’m not blaming the scientists for this over reaction to their study. I am sure that the journal Science engaged in strong pre-publication promotion: more publicity is better for their advertising revenues. And the newspapers are equally at fault: they should speak to a broader range of scientists to obtain a more balanced view. I particularly blame the author of the Times article, Nicholas Wade, for not sufficiently researching his article.

Perhaps Dr. Liggett and his colleagues would benefit from the lessons of history - specifically, the history of poliomyelitis and its conquest. On March 9, 1911, three years after the isolation of poliovirus, The Rockefeller Institute issued a press release, saying that it believed “that its search for a cure for infantile paralysis is about to be rewarded. Within six months, according to Dr. Simon Flexner, definite announcement of a specific remedy may be expected.” They quoted Dr. Flexner:  “We have already discovered how to prevent the disease, and the achievement of a cure, I may conservatively say, is not now far distant.” Dr. Flexner’s imminent ‘cure’ was a failure, and a successful poliovirus vaccine required another 44 years of research. Last week’s Times article seemed to have a similar overdose of hubris.

A. C. Palmenberg, D. Spiro, R. Kuzmickas, S. Wang, A. Djikeng, J. A. Rathe, C. M. Fraser-Liggett, S. B. Liggett (2009). Sequencing and Analyses of All Known Human Rhinovirus Genomes Reveals Structure and Evolution Science DOI: 10.1126/science.1165557

This Week In Virology (TWiV) Rocks!!!!!!

Vincent Racaniello, Professor of Microbiology at the College of Physicians and Surgeons at Columbia University and co-founder of BioCrowd ,has created a weekly series called This Week In Virology (TWiV). Each week Professors  Racaniello and Dickson Despommier (another Columbia virologist) discuss the latest developments and public health concerns for a variety of viral diseases.

The weekly discussions are packaged as podcasts, posted on TWiV and Science Podcasters.org and can be downloaded from iTunes. Dr. Racaniello eventually wants to offer TWiV in a vcast format and use it to inform the public and teach students about viral diseases.

So far, Vincent and Dick have created nine TWIV podcasts. Some of viruses that they have discussed include: HIV, Polio, Lassa fever, Rabies, West Nile Virus and even video game viruses. The podcasts are interesting, informative and a good way to learn something about virology—something that may liven up your daily commute!

Until next time,

Good Luck and Good Job Hunting