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Interaction of cefdinir with beta-lactamases
Drugs Under Experimental and Clinical Research
|January 1, 1994
Summary
Cefdinir, a third-generation cephalosporin, demonstrates high resistance to common beta-lactamases, including Ambler
Area of Science:
- Microbiology
- Pharmacology
- Biochemistry
Background:
- Beta-lactamase enzymes are a primary mechanism of bacterial resistance to beta-lactam antibiotics.
- Third-generation cephalosporins, like cefdinir, are crucial in treating bacterial infections but can be subject to hydrolysis by beta-lactamases.
- Understanding the interaction between novel antibiotics and resistance enzymes is vital for antimicrobial stewardship.
Purpose of the Study:
- To evaluate the susceptibility of cefdinir to various beta-lactamase enzyme preparations.
- To compare the stability of cefdinir against other beta-lactam antibiotics when exposed to different classes of beta-lactamases.
- To assess the potential of cefdinir in overcoming common bacterial resistance mechanisms.
Main Methods:
- Comparative analysis of cefdinir and other beta-lactams against cell-free beta-lactamase preparations.
- Testing against Ambler's class A (TEM-1, TEM-2, SHV-1, S. aureus penicillinase) and class C (E. coli, E. cloacae, M. morganii, P. vulgaris cephalosporinases) beta-lactamases.
- Evaluation of cefdinir's hydrolysis by novel extended-spectrum beta-lactamases (ESBLs) including SHV-2, TEM-3, TEM-5, and MEN-1.
Main Results:
- Cefdinir exhibited high resistance to narrow-spectrum Ambler's class A beta-lactamases, similar to other oximino cephalosporins.
- Cefdinir showed minimal hydrolysis by Ambler's class C beta-lactamases (cephalosporinases), unlike cefaclor which was highly hydrolyzed.
- While cefdinir showed some hydrolysis by extended-spectrum beta-lactamases (ESBLs), its stability was notable compared to other agents.
Conclusions:
- Cefdinir possesses significant stability against a broad range of clinically relevant beta-lactamases, including common class A and class C enzymes.
- Its resistance profile suggests a reduced susceptibility to hydrolysis by many beta-lactamase-producing bacteria.
- Cefdinir represents a promising therapeutic option with potential to overcome common beta-lactamase-mediated resistance mechanisms.