Unlike apoptosis, which directly kills tumor cells, autophagy could, in addition to cell killing, allow survival of tumor cells under a nutrient-poor environment by providing free amino acids and metabolites from degraded proteins and subcellular organelles.
Since autophagy has been implicated in both cell killing and survival, we next determined if co-treatment of oligonucleotide with chloroquine, an autophagy inhibitor, would enhance or suppress overall cytotoxicity.
HIV infection is characterized by a progressive depletion of CD4 T cells due to direct killing, decreased survival of activated cells, and an impairment of thymic production and naive T-cell expansion capacity [ 27].
While approved kinase inhibitor drugs offer benefit in cancer treatment, further advances are required to avoid off-target-related toxicities, effect tumor selective cell killing, and improve survival rates in oncology patients.
Moreover, over-expression of the pilB gene alone in the non-pathogenic L. lactis was found to enhance resistance to phagocyte killing, increased bloodstream survival, and conferred virulence in a mouse model [31].
Interestingly, gbs1529 (srr-1), encoding a serine-rich repeat protein involved in adherence [31], gbs1308 (scpB), encoding a bifunctional protein which cleaves the complement component C5a and mediates adherence to fibronectin [32], and gbs2018 (bibA), which has been implicated in resistance to phagocytic killing and GBS survival in human blood [33], were up-regulated at 40°C.
For both photosensitisers, there was little direct cell killing but clonogenic survival decreased as the interval between treatment and excision increased.
These were his glory days: unarmed combat, silent killing, jungle warfare, heroic survival against the odds, breaking codes, breaking rules, reckless and nonchalant in the face of death, young and male and free and terribly alive.
At least he can take comfort in the prospect of playing Nadal on grass next time after the killing joylessness of mere survival on clay, where the champion's vicious top-spun forehand puts the ball in the most uncomfortable places.
Intriguingly, the pilin subunit PilB of PI-2a was also reported to mediate resistance to cathelicidin antimicrobial peptide and phagocyte killing, to increase bloodstream survival, and to confer virulence in a mouse challenge model [31].
