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Modelling concentrations of antimicrobial drugs: comparative pharmacokinetics of cephalosporin antimicrobials and accuracy of allometric scaling in food-producing and companion animals

BMC Veterinary Research volume 12, Article number: 185 (2016) Cite this article

Abstract

Background

To optimize antimicrobial dosing in different animal species, pharmacokinetic information is necessary. Due to the plethora of cephalosporin antimicrobials and animal species in which they are used, assessment of pharmacokinetics in all species is unfeasible. In this study we aimed to describe pharmacokinetic data of cephalosporins by reviewing the available literature for food producing and companion animal species. We assessed the accuracy of interspecies extrapolation using allometric scaling techniques to determine pharmacokinetic characteristics of cephalosporins in animal species for which literature data is unavailable. We assessed the accuracy of allometric scaling by comparing the predicted and the published pharmacokinetic value in an animal species/humans not included in the allometric modelling.

Results

In general, excretion of cephalosporins takes place mainly through renal mechanisms in the unchanged form and volume of distribution is limited in all animal species. Differences in plasma protein binding capacity and elimination half-life are observed but available information was limited. Using allometric scaling, correlations between body weight (BW) and volume of distribution (Vd) and clearance (Cl) were R 2 > 0.97 and R 2 > 0.95 respectively for ceftazidime, ceftiofur, cefquinome and cefepime but not ceftriaxone. The allometric exponent ranged from 0.80 to 1.31 for Vd and 0.83 to 1.24 for Cl. Correlations on half-life ranged from R2 0.07–0.655 (literature) and R2 0.102–0.876 (calculated).

Conclusions

Allometric scaling can be applied for interspecies extrapolation of cephalosporin pharmacokinetic parameters Vd and Cl, but not elimination half-life. We hypothesize that the accuracy could be improved by using more refined scaling techniques.

Background

Antimicrobials are used in both food-producing animals like cattle, pigs, poultry and rabbits and companion animals such as dogs, cats and horses. These animals are known to be potential reservoirs of microorganisms carrying antimicrobial resistance genes [1–5]. Emergence of resistance to antimicrobials in pathogens such as Enterobacteriaceae, Staphylococcus spp. and Streptococcus spp. has led to an increased awareness of the need to optimize dosing regimens [6, 7]. Third and fourth generation cephalosporins mainly target Gram-negative microorganisms such as Enterobacteriaceae (including Escherichia coli) and have decreased activity against Gram-positive microorganisms such as Staphylococcus spp. and Streptococcus spp., the primary target of earlier generation cephalosporins. However, before dosage regimens can be optimized detailed knowledge of the pharmacokinetics of cephalosporins is needed. We hypothesize that these data are available for major food-producing animal species such as cattle and pigs, but less so for species like rabbits and companion animals.

The objective of this study is to gain accurate pharmacokinetic data of cephalosporins in animal species for which these data are not available from literature. We intend to calculate these missing pharmacokinetic data by interspecies extrapolation of known pharmacokinetic data in other animal species using allometric scaling. The allometric scaling technique is one of the techniques used to determine the first-in-human dose of new drugs for clinical trials, which is also extrapolation of pharmacokinetic data between animal species [8, 9]. Studies have already proven allometric scaling can be applied for extrapolation of pharmacokinetic data of cephalosporins, but these studies were based on data from a limited selection of animal species [10, 11]. In this study we collect available pharmacokinetic data on cephalosporins of a range of food-producing (cattle, pigs, chickens, rabbits, horses) and companion animal (dogs, cats, rabbits, horses) species and assess the accuracy of interspecies extrapolation by allometric scaling of pharmacokinetic data over this broad range of animal species. We have opted for allometric scaling because this technique is less time consuming and requires less input parameters than more refined methods for interspecies extrapolation, like physiologically based pharmacokinetic (PBPK) modelling [12–14]. Also, allometric scaling is a more widely applied and understood technique.

In this study we present and review the pharmacokinetic data of cephalosporins available from literature for a wide range of animal species. Furthermore we subject basic pharmacokinetic parameters (clearance (Cl), volume of distribution (Vd) and elimination half-life (t½)) to allometric analysis and assess the accuracy of this method based on a larger subset of animal species than what is usually applied in allometric analysis.

Methods

Data collection

A search for literature reporting pharmacokinetic data of cephalosporins authorized for veterinary use and of cephalosporins authorized for human use and which are known to be used off-label in companion animals was performed in PubMed, Scopus and Google Scholar. Search statements included combinations of the following terms: pharmacokinetics, veterinary, cephalosporins and names of several specific animal species and/or cephalosporins. No language restriction was applied in the search. References describing pharmacokinetics of combination therapies were excluded from the results as other compounds can potentially interfere with the pharmacokinetics of the cephalosporin(s) studied. Data retrieved after administration by other routes than the intravenous route was excluded in order to eliminate the influence of absorption pharmacokinetics. Studies in that were performed with experimental (non-therapeutic) dosages were also excluded.

Allometric analysis

Allometric scaling based on body weight was applied to the collected pharmacokinetic data, to the parameters Vd, Cl and t½. These pharmacokinetic parameters are the core parameters reported in pharmacokinetic studies and therefore for these parameters most data is available. Data on other pharmacokinetic indices is limited, making allometric analysis unfeasible. The availability of data and importance in the description of pharmacokinetic behaviour of a compound makes Vd, Cl and t½ the best candidates for allometric scaling.

For the analysis the allometric equation (Eq. 1) was used, which can be written as follows [8, 9, 11, 15]:

$$ Y=a{W}^b $$
(1)

where Y is the pharmacokinetic parameter of interest, W is the body weight in kg, a is the coefficient of the allometric equation and b is the allometric exponent. Log-transformed this equation turns into a linear function and the equation (Eq. 2) is represented as follows [8, 11]:

$$ \log Y= \log a+b \log W $$
(2)

with log a being the intercept and b being the slope. As Y and W were known parameters, values for a and b could be calculated with a trend line. The trend line also enabled assessment of the correlation between pharmacokinetic values for different animal species.

Allometric scaling was performed for those active substances with pharmacokinetic data obtained after intravenous administration available for at least four different species of animals to allow for robust allometric analysis. Young animals were considered an extra animal species due to often substantial differences in body weight and potential differences in pharmacokinetics compared to adults. The mean body weight and values for Vd, Cl and t½ were all retrieved from the collected pharmacokinetic studies and no other sources were used.

To evaluate the accuracy of extrapolation of pharmacokinetics across animal species with allometric models, pharmacokinetic parameters in humans and other animal species were extrapolated (based on the reported mean animal body weight) and then compared with the observed pharmacokinetic parameters for the species. Ceftazidime, authorized for human use, was evaluated with and without human pharmacokinetic data. Ceftiofur and cefquinome pharmacokinetic data from other animal species were used as reference due to the exclusively veterinary use of these cephalosporins.

Analyses were performed using RStudio Version 0.98.490. 2013 (RStudio inc. Boston, USA) and Excel 2010 (Microsoft, Redmond, Washington, USA).

Results

Pharmacokinetics of cephalosporins

The collected pharmacokinetic data on cephalosporins are presented in Additional file 1: Table S1. Pharmacokinetics of 1st and 2nd generation cephalosporins for the included animal species were available from 15 studies (horses n = 7, dogs n = 4, cats n = 2 and cattle n = 2) involving 5 different cephalosporins (cefadroxil, cefazolin, cefapirin, cefalexin and cefoxitin). An interspecies difference was observed for plasma protein binding between horses and cattle for cefazolin (75 % in cattle, compared to 8.3 % in horses). Comparing different cephalosporins over all species, cefazolin had the shortest elimination half-life (ranging from 0.62 h in cattle to 1.23 h in dogs) and cefalexin the longest (1.38 h in dogs to 2.02 h in horses). Volume of distribution was limited for all cephalosporins (ranging from 0.135 L/kg (cefazolin in horses) to 0.374 L/kg (cefadroxil in horses)). Clearance ranged from 0.140 L/kg/h (cefalexin and cefoxitin in cats) to 0.598 L/kg/h (cefapirin in horses). Data was too limited for comparison of different cephalosporins within each animal species, except in horses. No substantial differences exist between pharmacokinetics of different cephalosporins in horses; t½ is short (ranging from 0.63 to 2.02 h), volume of distribution is limited (0.135–0.374 L/kg) and excretion is mainly through renal mechanisms for all compounds with a clearance of 0.204–0.598 L/kg/h.

For 3rd and 4th generation cephalosporins 38 studies (cattle n = 9, chickens n = 2, pigs n = 3, horses n = 10, dogs n = 9, cats n = 4 and rabbits n = 4) met the inclusion criteria. Some studies covered multiple animal species. Clinically relevant interspecies differences in elimination half-life were observed for ceftiofur, half-life ranged from 4.23 h in chicken to 21.5 h in horses. Intermediate half-lives were found for calves (16.1 h), pigs (11.01 h) and foals (5.17–8.08 h). In general, elimination half-life was short for the other cephalosporins (except cefovecin) with limited interspecies differences: cefoperazone 0.50–2.13 h, ceftazidime 0.73–2.31 h, ceftriaxone 0.81–3.25 h, cefotaxime 0.60–3.48 h, cefquinome 0.85–2.77 h, cefepime 1.09–2.38 h and cefpirome 0.79–1.48 h.

Excretion of 3rd and 4th generation cephalosporins is mainly renal and unchanged. Two 3rd and 4th generation cephalosporins are not excreted unchanged. These are ceftiofur, which is metabolized by the liver to active desfuroylceftiofur and cefotaxime which is metabolized to active desacetylcefotaxime (see Additional file 1: Table S1). Depending on the cephalosporin, elimination can be through glomerular filtration with or without the addition of tubular secretion. For ceftazidime it was reported for cats [16] that glomerular filtration is the mechanism of excretion. This is confirmed by comparing the clearance for ceftazidime in cats (0.190 L/kg/h) to the glomerular filtration rate (GFR) measured in cats (renal inulin clearance) of 0.182 L/kg/h) [17]. For ceftriaxone it is reported that the mechanism of excretion in cats is through glomerular filtration and tubular secretion and/or non-renal excretion with a clearance of 0.370 L/kg/h [18], which exceeds the GFR in cats. In dogs the measured GFR (renal inulin clearance) is 0.235 L/kg/h [17]. The clearance of ceftazidime in dogs is reported to be 0.192 L/kg/h [19] and 0.228 L/kg/h [20]. This relates very well to the GFR in dogs. The reported clearance of ceftriaxone is 0.217 L/kg/h [21] in dogs, which is also close to the GFR. This might indicate that ceftazidime is excreted exclusively through glomerular filtration in both dogs and cats, yet, for ceftriaxone this only seems to be the case for dogs and not for cats. The renal clearance of cefquinome ranges from 0.191 to 0.221 L/kg/h [22] in dogs. Although the mechanism of excretion is not mentioned in the study, it correlates so well to the GFR in dogs that also cefquinome is probably excreted exclusively through glomerular filtration in dogs. Data on cats is not available.

Allometric analysis

Sufficient pharmacokinetic data to apply allometric analysis was available for five cephalosporins, cefquinome, ceftriaxone, ceftazidime, ceftiofur and cefepime. The results of the allometric scaling regression analysis (allometric coefficient, allometric exponent and correlation (R2)) of volume of distribution, clearance and elimination half-life are shown in Table 1. Graphs on the allometric scaling of ceftazidime (including human data) and cefquinome (exclusively veterinary use) are presented in Fig. 1. The allometric analyses of cefepime, ceftriaxone and ceftiofur are shown in Additional file 1: Figure S1 t/m S3. Additional file 1: Figure S4 shows the allometric analysis for ceftazidime excluding human data. For ceftazidime, ceftiofur, cefquinome and cefepime (but not ceftriaxone) correlations between body weight and both parameters volume of distribution and clearance were high (R 2 > 0.97 and R 2 > 0.95 respectively). The allometric exponent for all five cephalosporins ranged from 0.80 to 1.31 for Vd and 0.83 to 1.24 for Cl. Half-life proved to be less predictable using allometric scaling with R2 0.067–0.655 based on the values for half-life retrieved from literature. Calculating half-life (t½ = (ln2*Vd)/Cl) improved correlation to a range of R2 0.102–0.876. The calculated half-life per study is available in Additional file 1: Table S1. For cefepime correlation improved the most after calculating (from R2 0.628 to 0.876). Correlations for ceftriaxone and ceftazidime remained almost equal (R2 0.067 versus 0.102 and R2 0.655 versus 0.662 respectively) and dropped for ceftiofur and cefquinome (R2 0.481 versus 0.128 for ceftiofur and R2 0.388 versus 0.243 for cefquinome).

Table 1 Allometric scaling of pharmacokinetics of different cephalosporins in animals
Full size table
Fig. 1
figure 1

Two examples of allometric analysis performed on pharmacokinetic data of cephalosporins. Figure shows clearance, volume of distirubution and half-life of ceftazidime (3rd generation cephalosporin) and cefquinome (4th generation cephalosporin). Ceftazidime is also used in human medicine, human data are included in this figure and the equation and R2 shown are based on allometric analysis including human data

Full size image

To further assess accuracy of extrapolation of pharmacokinetics to humans for ceftriaxone, ceftazidime and cefepime, two human pharmacokinetic studies per cephalosporin were used to compare extrapolated pharmacokinetics to observed data. For ceftazidime allometric scaling was repeated with the human data included, to assess the changes to the allometric equation and correlation coefficient. The scaling including human data is shown in Fig. 1 (without human data in Additional file 1: Figure S4). As can be seen in the figures and Table 1 the correlation drops for all three pharmacokinetic parameters, especially for the elimination half-life (from R2 0.655 to 0.472). For ceftriaxone and cefepime no allometric scaling including human data was performed. All studies were performed on healthy volunteers, as pharmacokinetics used for the allometric model were also mostly assessed in healthy animals. For ceftiofur three additional animal species were used with a wide range of body weights, namely goats, camels and Asian elephants. For cefquinome studies in ducks and buffalo were used. Data and results are presented in Table 2. Pharmacokinetics for cefepime could be extrapolated to humans with the animal based allometric equation. For ceftazidime the model overestimated the pharmacokinetic values. Observed Vd was 30–40 % lower than the predicted value and observed Cl was 35–40 % lower than predicted. For ceftriaxone the model overestimated the observed value for Vd about 4 times (extrapolated 0.4 L/kg, observed 0.1 L/kg) and the value for Cl about 23 times (extrapolated 0.280 L/kg/h, observed 0.012 L/kg/h). Allometric scaling of ceftiofur was only accurate for clearance in goats. Pharmacokinetic values for cefquinome could be extrapolated to ducks with reasonable accuracy, but the clearance in buffalo was overestimated (extrapolated 0.149 L/kg/h, observed 0.061 L/kg/h).

Table 2 Extrapolated volume of distribution and clearance by allometric scaling versus volume of distribution and clearance
Full size table

Discussion

Pharmacokinetic data on cephalosporins in different animal species presented here shows that, independent of animal species, cephalosporins have a limited distribution in body tissues other than plasma, undergo no or little biotransformation and the primary route of elimination is through renal mechanisms with a generally short elimination half-life. Our study underlines the possibility of interspecies extrapolation of pharmacokinetic parameters of cephalosporins with allometric scaling, at least for volume of distribution and clearance and less for elimination half-life. In other studies, allometric scaling of a variety of drugs (not cephalosporins) also showed good overall correlation of volume of distribution and clearance with body weight across species, especially when at least one large animal (for example cattle or horses) were added to the scaling besides laboratory animals such as mice, rats and dogs [8]. Only one of the four cephalosporins used in allometric analyses by Riviere et al. [11] showed a high correlation between body weight and elimination half-life (R2 of 0.97 for cefapirin). For the other three cephalosporins correlation was poor (R2 0.03 for cefamandole, 0.07 for cefazolin and 0.20 for cefalothin). These findings are in agreement with the results presented in this paper. It should be noted, however, that for some drugs elimination half-life does scale well with body weight, as shown with carboplatin in several avian species [23] and for example tetracycline (R2 0.97) by Riviere et al. [11] and should therefore still be considered as a scaling parameter when performing allometric analysis.

Although the pharmacokinetic profile of cephalosporins in general was comparable between animal species some specific differences were noted. One of the observed differences was in the plasma protein binding. Values for plasma protein binding were only scarcely reported in the reviewed studies and therefore impossible to extrapolate to other animal species. Results in laboratory animals showed high protein binding for ceftriaxone in rabbits and rodents [24] and an overall higher plasma protein binding in rabbits compared to rodents and dogs, independent of cephalosporin [25]. The effect of plasma protein binding on pharmacokinetics can be substantial for drugs with high protein binding and renal clearance, as is reported for cefovecin. High plasma protein binding is thought to account for the extremely long elimination half-life of cefovecin in cats and dogs [26, 27]. but in order to understand the exact impact of plasma protein binding on pharmacokinetics of cephalosporins more experimental data is needed.

Also, some cephalosporins like ceftriaxone, are eliminated through the faeces as well as through urine, but not to the same extent in all animal species. Pharmacokinetics of drugs that are primarily excreted biliary prove harder to extrapolate due to differences in biliary excretion and bile flow rates between animal species. Dogs and chickens are good biliary excretors, while cats are moderate and rabbits and humans are poor biliary excretors [28]. Furthermore, interspecies differences in enterohepatic circulation and urine pH exist that can influence elimination pharmacokinetics [11]. Carnivores such as dogs and cats generally have acidic urine (pH 5.5–7.0) while herbivores like cattle and horses have alkaline urine (pH 7.0–9.0) [28]. Extrapolation can also be expected to be less accurate for active compounds undergoing capacity-limited hepatic biotransformation rather than flow limited hepatic biotransformation and excretion as interspecies differences exist for these drug metabolism processes. This may contribute to the differences in metabolism of ceftiofur, which probably leads to the poor extrapolation of pharmacokinetics across animal species observed here. Cats, for example, are known to be poor in glucuronidation while dogs on the other hand are deficient acetylators and pigs lack sulfation capacity [28]. Cattle is known to metabolize ceftiofur very efficiently to desfuroylceftiofur [29], perhaps to a greater extent than other animal species. It should also be noted that the young age of the calves could have influenced the results, as young animals have relatively more water and less fat than adult animals (influencing volume of distribution) and organs involved in drug metabolism and elimination still mature in the first few months of life [28].

Finally, it could be hypothesized that coprophagy (or caecotrophy) increases gut exposure to antimicrobials and alters pharmacokinetics of active substances in animals that display this behaviour (such as rabbits, who eat the soft parts of their own excrement, but also pigs, horses and dogs who eat the excrements from other animals [30]). However, no literature is available to assess the significance on these processes and in our results we observed no particular differences in pharmacokinetics in rabbits compared to other animal species.

Allometric scaling of the pharmacokinetics of cephalosporins will assist the parametrization of models for simulation of drug distribution in food-producing and companion animals, such as PBPK models. Where allometric scaling is applied for extrapolation of pharmacokinetic values, PBPK models can extrapolate plasma and tissue concentration-time curves of chemical compounds across animal species, which is ideal for dose optimization of antimicrobials for different animal species.

Conclusion

Pharmacokinetic behaviour of cephalosporin antimicrobials is in general very similar between animal species. It was shown that extrapolation of pharmacokinetic values for volume of distribution and clearance of most cephalosporins across food-producing and companion animal species can be performed using allometric scaling.

Abbreviations

Cl:

Clearance of a compound from the body

R2 :

Correlation

t½:

Elimination half-life of the compound

Vd:

Volume of distribution of a compound in the body

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Acknowledgements

The authors would like to thank dr. Nynke Kramer for her critical review of the manuscript.

Funding

The work described in this manuscript was supported by the Netherlands Veterinary Medicines Authority (SDa). No additional funding was received.

Availability of data and materials

The data sets supporting the results of this article are included within the article and its supplementary file (Additional file 1).

Authors’ contributions

FT carried out the literature search, assessment of the quality of pharmacokinetic studies and performed the allometric analysis. IvG contributed to the design of the study, interpretation of the results and reviewing and revising of the manuscript. DH and JW assisted in interpretation of the results and critical review of the manuscript. JM contributed to the study design, participated in interpretation of the results and revision and review of the manuscript. All authors have read and approved the final version of this manuscript.

Competing interests

The authors declare that they have no competing interests.

Consent for publication

Not applicable.

Ethics approval and consent to participate

The authors did not perform any animal studies to gather data for this article. All animal data was retrieved from published literature.

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Authors and Affiliations

  1. The Netherlands Veterinary Medicines Authority (SDa), Yalelaan 114, 3584 CM, Utrecht, The Netherlands

    Femke J. Taverne, Ingeborg M. van Geijlswijk, Dick J. J. Heederik, Jaap A. Wagenaar & Johan W. Mouton

  2. Institute for Risk Assessment Sciences, Utrecht University, Yalelaan 2, 3584 CM, Utrecht, The Netherlands

    Femke J. Taverne & Dick J. J. Heederik

  3. Pharmacy Department, Faculty of Veterinary Medicine, Utrecht University, Yalelaan 106, 3584 CM, Utrecht, The Netherlands

    Femke J. Taverne & Ingeborg M. van Geijlswijk

  4. Department of Infectious Diseases & Immunology, Faculty of Veterinary Medicine, Utrecht University, Yalelaan 1, 3584 CL, Utrecht, The Netherlands

    Jaap A. Wagenaar

  5. Central Veterinary Institute, Wageningen UR, Houtribweg 39, 8221 RA, Lelystad, The Netherlands

    Jaap A. Wagenaar

  6. Department of Medical Microbiology and Infectious Diseases, Erasmus MC, Wytemaweg 80, 3015 CN, Rotterdam, The Netherlands

    Johan W. Mouton

Authors
  1. Femke J. Taverne
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  2. Ingeborg M. van Geijlswijk
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  4. Jaap A. Wagenaar
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Corresponding author

Correspondence to Femke J. Taverne.

Additional file

Additional file 1:

Pharmacokinetics of cephalosporins in food producing and companion animal species obtained from literature and presented in a table with literature references. We also provide additional graphs displaying the allometric analysis of cefepime, ceftriaxone, ceftiofur and ceftazidime. (PDF 666 kb)

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Taverne, F.J., van Geijlswijk, I.M., Heederik, D.J.J. et al. Modelling concentrations of antimicrobial drugs: comparative pharmacokinetics of cephalosporin antimicrobials and accuracy of allometric scaling in food-producing and companion animals. BMC Vet Res 12, 185 (2016). https://doi.org/10.1186/s12917-016-0817-2

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Keywords

BMC Veterinary Research

ISSN: 1746-6148

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