Background: FDA issues warning letters to pharmaceutical manufacturers, distributors, or clinical investigators if it observes serious violations of federal regulations. These warning letters contain the details about the nature of the violations observed and the corrective actions recommended by the FDA. A follow-up inspection may be requested by the recipient after taking the corrective actions.
Methods: Analysis of warning letters issued to Indian pharmaceutical companies from January 1, 2005, to December 31, 2018, was carried out. The warning letters were extracted from FDA's public database.
Results: Across the 14-year study period, the number of warning letters issued to Indian pharmaceutical and medical device manufacturers has gradually increased. Of all the violations listed in these warning letters, 85.87% were related to the failure of compliance with the cGMP guidelines. Moreover, 80.72% of these warning letters were not followed by a close-out warning, which indicated that the violations listed in these warning letters could not be resolved.
Conclusion: As the inability of the recipients to comply with the cGMP guidelines formed the majority of the violations observed in the warning letters, more resources and manpower have to be assigned to the manufacturing process of the pharmaceutical products.
Egg activation is the process in which mature oocytes are released from developmental arrest and gain competency for embryonic development. In Drosophila and other arthropods, eggs are activated by mechanical pressure in the female reproductive tract, whereas in most other species, eggs are activated by fertilization. Despite the difference in the trigger, Drosophila shares many conserved features with higher vertebrates in egg activation, including a rise of intracellular calcium in response to the trigger. In Drosophila, this calcium rise is initiated by entry of extracellular calcium due to opening of mechanosensitive ion channels and initiates a wave that passes across the egg prior to initiation of downstream activation events. Here, we combined inhibitor tests, germ-line-specific RNAi knockdown, and germ-line-specific CRISPR/Cas9 knockout to identify the Transient Receptor Potential (TRP) channel subfamily M (Trpm) as a critical channel that mediates the calcium influx and initiates the calcium wave during Drosophila egg activation. We observed a reduction in the proportion of eggs that hatched from trpm germ-line knockout mutant females, although eggs were able to complete some egg activation events including cell cycle resumption. Since a mouse ortholog of Trpm was recently reported also to be involved in calcium influx during egg activation and in further embryonic development, our results suggest that calcium uptake from the environment via TRPM channels is a deeply conserved aspect of egg activation.
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