AMHERST — Bedbugs, once nearly eradicated in the urban environment, have made a big comeback recently, especially in metro centers such as New York City. In the first study to explain the failure to control certain bedbug populations, toxicologists at UMass Amherst and Korea’s Seoul National University show that some of these nocturnal bloodsuckers have developed resistance to pyrethroid insecticides, in particular deltamethrin, that attack their nervous systems.
The study by senior researcher John Clark and colleagues, published in the current issue of the Journal of Medical Entomology, reveals that these pests have evolved to outsmart the latest generation of chemicals used to control them since DDT was banned. In providing this first look at a mechanism, the researchers summarize that diagnostic tools to detect the relevant mutation in bedbug populations have been “urgently needed for effective control and resistance management.”
Specifically, Clark and colleagues found that bedbugs in New York City have acquired mutations in their nerve cells, which blunt the neurotoxic effect of the pyrethroid toxins used against them. The mutations affect sodium channels (resembling pores) in the neurons’ outer membrane, where electrical nerve impulses are produced. In the past, these nervous system poisons could effectively paralyze and kill the bugs, but this is no longer always the case.
Resistance means mutations are acquired over time by selection with pyrethroids, so the neuronal pores no longer respond to their toxic effects. Clark and colleagues found that these pores in New York City bedbugs are now as much as 264 times more resistant to deltamethrin. This means that, even if treated, New York City bedbugs go on to suck blood from unsuspecting sleepers for many more nights.
The researchers are not sure how widely this resistance has spread — that is, whether the bugs that infest hotels, apartment buildings and homes in places other than New York City have developed the same type of immunity to chemical control. But as Clark states, “this type of pyrethroid resistance is common in many pest insects, and the failure of the pyrethroids to control bedbug populations across the U.S. and elsewhere indicates that resistance is already widespread.”
For this study, the researchers collected hard-to-control bedbugs from New York City, plus easy-to-control bedbugs from an untreated colony in Florida. The New York population was determined to be highly resistant to deltamethrin compared to the Florida population by contact exposure. Further, they found that resistance was not due to the increased breakdown of deltamethrin (enzymatic metabolism) by the resistant bedbugs, but appeared to be due to an insensitive nervous system.
Using molecular techniques, the researchers sequenced genes related to the sodium ion channel’s operation in both groups and identified two mutations found only in the resistant population. Similar mutations have been found in other pyrethroid-resistant insects and are likely the cause of the resistance in bed bugs, Clark and colleagues note. This helps to narrow the focus of the next set of experiments designed to reveal more about the acquired resistance.
There are several kinds of bedbugs, but the one best adapted to the human environment is known in Latin as cimex (‘a bug’) lectularius (‘lying down at home’). Bedbugs arrived on ths continent with the earliest European visitors. These nocturnal pests feed about once every five to 10 days but are not thought to spread disease. They use two tubes, one to inject an anticoagulant and mild anesthetic, the other to suck blood.