Document Detail

Sugar cell responses to lactose and sucrose in labellar and tarsal taste hairs of Musca domestica.
MedLine Citation:
PMID:  9631555     Owner:  NLM     Status:  MEDLINE    
Receptor cell responses in the largest labellar (LL) and tarsal (D) taste hairs of the housefly Musca domestica were investigated electrophysiologically using the tip-recording technique. In LL hairs, test series with lactose in concentrations of 12.5-400 mmol.l-1 yielded a threshold concentration around 12 mmol.l-1 and a calculated concentration eliciting half-maximal response of around 40 mmol.l-1, the maximal response varying between 18 and 30 impulses/300 ms. D hairs are more sensitive towards lactose, indicated by a slightly lower threshold and a by 60% higher response to 400 mmol.l-1 lactose. The high variation in the relative stimulating effectiveness of lactose and sucrose and experiments with sugar mixtures imply that these sugars bind to different receptor sites without noticeable cross affinity. A comparison of the concentration response characteristics for sucrose and lactose in LL and D hairs suggests that sucrose can combine with more than one site type, expressed in different proportions in both hair types. Results obtained with p-nitrophenyl-beta-galactoside as stimulus indicate that a beta-galactoside link is not sufficient for a substance to interact specifically with the lactose binding site. The exceptional lactose sensitivity of the sugar cell in M. domestica is discussed in the context of food acquirement and digestion.
M Schnuch; H Seebauer
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of comparative physiology. A, Sensory, neural, and behavioral physiology     Volume:  182     ISSN:  -     ISO Abbreviation:  J. Comp. Physiol. A     Publication Date:  1998 Jun 
Date Detail:
Created Date:  1998-07-09     Completed Date:  1998-07-09     Revised Date:  2014-07-21    
Medline Journal Info:
Nlm Unique ID:  8413199     Medline TA:  J Comp Physiol A     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  767-75     Citation Subset:  IM    
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MeSH Terms
Carbohydrates / pharmacology
Chemoreceptor Cells / drug effects*,  physiology*
Drug Combinations
Houseflies / physiology*
Lactose / pharmacology*
Nitrophenylgalactosides / pharmacology
Sucrose / pharmacology*
Taste / physiology*
Reg. No./Substance:
0/Carbohydrates; 0/Drug Combinations; 28347-45-7/Nitrophenylgalactosides; 3150-24-1/4-nitrophenylgalactoside; 57-50-1/Sucrose; J2B2A4N98G/Lactose

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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