In the first study to explain the failure to control certain bed bug populations, toxicologists at the University of Massachusetts Amherst and Korea’s Seoul National University show that some of these nocturnal blood suckers have developed resistance to pyrethroid insecticides, in particular deltamethrin, that attack their nervous systems.
The study by senior researcher John Clark and colleagues 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 bed bug populations have been “urgently needed for effective control and resistance management.”
Specifically, Clark and colleagues found that bed bugs 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 bed bugs are now as much as 264 times more resistant to deltamethrin. This means that even if treated, New York City bed bugs 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 bed bug populations across the United States and elsewhere indicates that resistance is already widespread.”
For this study, the researchers collected hard-to-control bed bugs from New York City, plus easy-to-control bed bugs from an untreated colony in Florida, Clark explains. The New York population was determined to be highly resistant (264 times more 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 bed bugs but appeared to be due to an insensitive nervous system.
Using molecular techniques, they 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 bed bugs but the one best adapted to the human environment is known in Latin as Cimex (“a bug”) lectularius (“lying down at home”), which shows how long they’ve been with us. Bed bugs arrived here 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.
Janet Lathrop | Newswise Science News
Photoactive bacteria bait may help in fight against MRSA infections
12.10.2018 | Purdue University
15 emerging technologies that could reduce global catastrophic biological risks
10.10.2018 | Johns Hopkins Center for Health Security
Augsburg chemists present a new technology for compressing, storing and transporting highly volatile gases in porous frameworks/New prospects for gas-powered vehicles
Storage of highly volatile gases has always been a major technological challenge, not least for use in the automotive sector, for, for example, methane or...
When we put water in a freezer, water molecules crystallize and form ice. This change from one phase of matter to another is called a phase transition. While this transition, and countless others that occur in nature, typically takes place at the same fixed conditions, such as the freezing point, one can ask how it can be influenced in a controlled way.
We are all familiar with such control of the freezing transition, as it is an essential ingredient in the art of making a sorbet or a slushy. To make a cold...
Thin organic layers provide machines and equipment with new functions. They enable, for example, tiny energy recuperators. In future, these will be installed...
Das Zusammenspiel aus Struktur und Dynamik bestimmt die Funktion von Proteinen, den molekularen Werkzeugen der Zelle. Durch Fortschritte in der...
New measurement method allows researchers to precisely follow the movement of individual molecules over long periods of time
The function of proteins – the molecular tools of the cell – is governed by the interplay of their structure and dynamics. Advances in electron microscopy have...
16.10.2018 | Event News
02.10.2018 | Event News
01.10.2018 | Event News
16.10.2018 | Life Sciences
16.10.2018 | Physics and Astronomy
16.10.2018 | Event News