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Bochnia, M.; Ziegler, J.; Glatter, M.; Zeyner, A.; Hypoglycin A in cow’s milk—A pilot study Toxins 13, 381, (2021) DOI: 10.3390/toxins13060381
Hypoglycin A (HGA) originating from soapberry fruits (litchi, and ackee) seeds or seedlings from the sycamore maple (SM) tree (related to
Sapindaceae) may cause Jamaican vomiting sickness in humans and atypical myopathy in horses and ruminants. A possible transfer into dairy cow’s milk cannot be ruled out since the literature has revealed HGA in the milk of mares and in the offal of captured deer following HGA intoxication. From a study, carried out for another purpose, bulk raw milk samples from four randomly selected dairy farms were available. The cows were pastured in the daytime. A sycamore maple tree was found on the pasture of farm No. 1 only. Bulk milk from the individual tank or milk filling station was sampled in parallels and analyzed for HGA by LC-ESI-MS/MS. Measurable concentrations of HGA occurred only in milk from farm No. 1 and amounted to 120 and 489 nmol/L. Despite low and very variable HGA concentrations, the results indicate that the ingested toxin, once eaten, is transferred into the milk. However, it is unknown how much HGA the individual cow ingested during grazing and what amount was transferred into the bulk milk samples. As a prerequisite for a possible future safety assessment, carry-over studies are needed. Furthermore, the toxins’ stability during milk processing should also be investigated as well.
Bassal, M.; Abukhalaf, M.; Majovsky, P.; Thieme, D.; Herr, T.; Ayash, M.; Tabassum, N.; Al Shweiki, M. R.; Proksch, C.; Hmedat, A.; Ziegler, J.; Lee, J.; Neumann, S.; Hoehenwarter, W.; Reshaping of the Arabidopsis thaliana Proteome Landscape and Co-regulation of Proteins in Development and Immunity Mol. Plant 13, 1709-1732, (2020) DOI: 10.1016/j.molp.2020.09.024
Proteome remodeling is a fundamental adaptive response, and proteins in
complexes and functionally related proteins are often co-expressed.
Using a deep sampling strategy we define core proteomes of Arabidopsis thaliana
tissues with around 10 000 proteins per tissue, and absolutely quantify
(copy numbers per cell) nearly 16 000 proteins throughout the plant
lifecycle. A proteome-wide survey of global post-translational
modification revealed amino acid exchanges pointing to potential
conservation of translational infidelity in eukaryotes. Correlation
analysis of protein abundance uncovered potentially new tissue- and
age-specific roles of entire signaling modules regulating transcription
in photosynthesis, seed development, and senescence and abscission.
Among others, the data suggest a potential function of RD26 and other
NAC transcription factors in seed development related to desiccation
tolerance as well as a possible function of cysteine-rich receptor-like
kinases (CRKs) as ROS sensors in senescence. All of the components of
ribosome biogenesis factor (RBF) complexes were found to be co-expressed
in a tissue- and age-specific manner, indicating functional promiscuity
in the assembly of these less-studied protein complexes in Arabidopsis. Furthermore, we characterized detailed proteome remodeling in basal immunity by treating Arabidopsis
seeldings with flg22. Through simultaneously monitoring
phytohormone and transcript changes upon flg22 treatment, we obtained
strong evidence of suppression of jasmonate (JA) and JA-isoleucine
(JA-Ile) levels by deconjugation and hydroxylation by IAA-ALA RESISTANT3
(IAR3) and JASMONATE-INDUCED OXYGENASE 2 (JOX2), respectively, under
the control of JASMONATE INSENSITIVE 1 (MYC2), suggesting an
unrecognized role of a new JA regulatory switch in pattern-triggered
immunity. Taken together, the datasets generated in this study present
extensive coverage of the Arabidopsis proteome in various biological scenarios, providing a rich resource available to the whole plant science community.