• HOME
  • NEWS
  • EXPLORE
    • CAREER
      • Companies
      • Jobs
    • EVENTS
    • iGEM
      • News
      • Team
    • PHOTOS
    • VIDEO
    • WIKI
  • BLOG
  • COMMUNITY
    • FACEBOOK
    • INSTAGRAM
    • TWITTER
Sunday, June 15, 2025
BIOENGINEER.ORG
No Result
View All Result
  • Login
  • HOME
  • NEWS
  • EXPLORE
    • CAREER
      • Companies
      • Jobs
        • Lecturer
        • PhD Studentship
        • Postdoc
        • Research Assistant
    • EVENTS
    • iGEM
      • News
      • Team
    • PHOTOS
    • VIDEO
    • WIKI
  • BLOG
  • COMMUNITY
    • FACEBOOK
    • INSTAGRAM
    • TWITTER
  • HOME
  • NEWS
  • EXPLORE
    • CAREER
      • Companies
      • Jobs
        • Lecturer
        • PhD Studentship
        • Postdoc
        • Research Assistant
    • EVENTS
    • iGEM
      • News
      • Team
    • PHOTOS
    • VIDEO
    • WIKI
  • BLOG
  • COMMUNITY
    • FACEBOOK
    • INSTAGRAM
    • TWITTER
No Result
View All Result
Bioengineer.org
No Result
View All Result
Home NEWS Science News Biology

Why do carnivorous cats lick and chew catnip and silver vine plants which are not food?

Bioengineer by Bioengineer
June 14, 2022
in Biology
Reading Time: 5 mins read
0
ADVERTISEMENT
Share on FacebookShare on TwitterShare on LinkedinShare on RedditShare on Telegram

The research team first focused on their observation that silver vine leaves crumpled and torn by feline licking and chewing appeared to have a much stronger aromatic odor compared to intact leaves. They quantified the airborne emission and chemical profiles of iridoids that induce the feline response (such as nepetalactol, dihydronepetalactone, and isoiridomyrmecin) before and after feline licking and chewing. Physical damage of silver vine by cats promoted the immediate emission of total iridoids, which was 10-fold higher than from intact leaves. Leaf damage also changed the composition of iridoids in silver vine. Nepetalactol accounts for over 90% of total iridoids in intact leaves, but this drops to about 45% in damaged leaves as other iridoids greatly increase.

Feline licking and chewing

Credit: Masao Miyazaki & Reiko Uenoyama

The research team first focused on their observation that silver vine leaves crumpled and torn by feline licking and chewing appeared to have a much stronger aromatic odor compared to intact leaves. They quantified the airborne emission and chemical profiles of iridoids that induce the feline response (such as nepetalactol, dihydronepetalactone, and isoiridomyrmecin) before and after feline licking and chewing. Physical damage of silver vine by cats promoted the immediate emission of total iridoids, which was 10-fold higher than from intact leaves. Leaf damage also changed the composition of iridoids in silver vine. Nepetalactol accounts for over 90% of total iridoids in intact leaves, but this drops to about 45% in damaged leaves as other iridoids greatly increase.

 

To examine whether these changes in iridoids when silver vine leaves are damaged influence the feline response, the research team prepared synthetic iridoid cocktails corresponding to the ratios found in intact versus damaged leaves, and presented these simultaneously to a set of cats. The altered iridoid mixture corresponding to damaged leaves promoted a much more prolonged response. “It was easy to speculate that the response duration would increase with the amount of iridoid. However, it was surprising that the change in iridoid composition when silver vine leaves were crumpled and torn by cats also greatly increased the cats’ response. The increased emission of iridoids from damaged leaves and changed chemical composition add together to induce a more extended duration of rubbing and rolling response, allowing cats to transfer more mosquito repellents to their fur. This helps to reduce the health risks and irritation associated with mosquitoes. We can say that licking and chewing these plant leaves also contributes to chemical pest defence in cats”, said Prof. Masao Miyazaki of Iwate University, a leader of the research project.

 

“We also examined whether feline licking and chewing of leaves has similar effects on the amount and composition of iridoids in the well-known cat attractant plant, catnip, as well as silver vine”, said Reiko Uenoyama, the paper’s first author. “Damaged catnip emitted 20-fold more total iridoids compared to intact leaves. However, in contrast to silver vine, leaf damage did not alter the composition of catnip iridoids. Both intact and damaged extracts of catnip consisted almost solely of nepetalactone, which is present at only very low levels in silver vine.”

 

Total iridoid levels were approximately 40-times higher in damaged catnip leaves compared to damaged silver vine leaves. The researchers examined whether these differences between damaged catnip and silver vine stimulated a different level of the feline response to these two plants. Interestingly, cats showed a comparable duration of response to 0.4 mg of damaged catnip-cocktail and 0.01 mg of damaged silver vine-cocktail, which corresponded to an equivalent amount of damaged catnip and silver vine. But if the same amount of iridoid cocktails was presented to cats from the two plants, they were much more responsive to the damaged silver vine-cocktail than damaged catnip cocktail, showing they are sensitive to the silver vine iridoids at a much lower concentration. This was not the case when the damaged silver vine-cocktail was modified by replacing the main silver vine iridoid nepetalactol in the mixture with catnip nepetalactone. “We found that the prolonged feline response to the complex iridoids emitted from damaged silver vine leaves depended on the combination of nepetalactol with other iridoids such as isodihydronepetalactone”, said Miyazaki.

 

Finally, the research team showed that mosquitoes are more sensitive to the complex cocktail of iridoids that is induced by damage to silver vine leaves compared to the nepetalactol-dominated iridoids in intact silver vine. The diversification of iridoids in damaged silver vine leaves provides a stimulus that is more repellent to mosquitoes at low concentration, inducing a faster aversive response than nepetalactol- or nepetalactone-dominated iridoids in plants.

 

Catnip and silver vine have been known as plants that are both unusually attractive to cats but are not closely related. These unrelated plants have evolved to produce very similar, but not identical iridoids as secondary plant metabolites. The research team suggests that the olfactory and behavioral sensitivity of cats to plant iridoids has been fine-tuned to show a prolonged characteristic response toward either a low level of complex iridoids emitted from damaged silver vine or a much higher level of nepetalactone emitted from damaged catnip. “Our findings highlight the possibility that plant-damaging behavior, which occurs alongside self-anointing, might play an important role in gaining pest-repellency in other animals as well as cats”, said Jane Hurst, the paper’s co-author at the University of Liverpool. “Our study has also provided valuable insight into how we can obtain potent natural repellents against pest insects from plants.”

 

Miyazaki and his colleagues are now examining the molecular mechanisms in the feline olfactory system that sense plant iridoids. Such studies promise to answer the key remaining questions of why this response is limited to Felidae species and why some cats do not respond to these plants.

 

Journal Article

Reiko Uenoyama, Tamako Miyazaki, Masaatsu Adachi, Toshio Nishikawa, Jane L. Hurst, and Masao Miyazaki. Domestic cat damage to plant leaves containing iridoids enhances chemical repellency to pests. iScience. DOI: 10.1016/j.isci.2022.104455

 

Research Contact

Professor Masao Miyazaki
Laboratory of Biomolecular Science, Department of Biological Chemistry and Food Sciences, Faculty of Agriculture, Iwate University. 3-18-8 Ueda, Morioka, Iwate 020-8550, JAPAN
TEL&FAX: +81-(0)19-621-6154
Email: [email protected]



Journal

iScience

DOI

10.1016/j.isci.2022.104455

Method of Research

Experimental study

Subject of Research

Animals

Article Title

Research Article

Article Publication Date

14-Jun-2022

Share12Tweet8Share2ShareShareShare2

Related Posts

Intact Mediterranean-type oak savanna (Tonzi Ranch), a research site of the University of California, Berke-ley, whose researchers contributed to the study

Consistent Ecosystem, Distinct Solutions

June 11, 2025
How flies grow their gyroscopes: study reveals how flight stabilizers take shape

Unraveling the Formation of Flight Stabilizers: How Flies Develop Their Gyroscopes

June 11, 2025

Soft, Flexible Neural Implants Integrated into Cyborg Tadpoles

June 11, 2025

Japan’s First Named Pterosaur Sheds New Light on Ancient Flying Reptiles

June 11, 2025

POPULAR NEWS

  • Green brake lights in the front could reduce accidents

    Study from TU Graz Reveals Front Brake Lights Could Drastically Diminish Road Accident Rates

    158 shares
    Share 63 Tweet 40
  • New Study Uncovers Unexpected Side Effects of High-Dose Radiation Therapy

    75 shares
    Share 30 Tweet 19
  • Pancreatic Cancer Vaccines Eradicate Disease in Preclinical Studies

    68 shares
    Share 27 Tweet 17
  • How Scientists Unraveled the Mystery Behind the Gigantic Size of Extinct Ground Sloths—and What Led to Their Demise

    65 shares
    Share 26 Tweet 16

About

We bring you the latest biotechnology news from best research centers and universities around the world. Check our website.

Follow us

Recent News

Urban Form Shapes Compound Natural Risk: US Study

Perivascular Fluid Diffusivity Predicts Early Parkinson’s Decline

Are Traditional Podcasters Becoming Obsolete? AI-Driven Podcasts Pave the Way for Accessible Science

  • Contact Us

Bioengineer.org © Copyright 2023 All Rights Reserved.

Welcome Back!

Login to your account below

Forgotten Password?

Retrieve your password

Please enter your username or email address to reset your password.

Log In
No Result
View All Result
  • Homepages
    • Home Page 1
    • Home Page 2
  • News
  • National
  • Business
  • Health
  • Lifestyle
  • Science

Bioengineer.org © Copyright 2023 All Rights Reserved.