Question: From which cell type is leptin secreted?

Context:
 Although leptin is produced mainly by white adipose tissue, several laboratories have shown low levels of leptin production by a growing number of tissues including the anterior pituitary gland.
Lipolysis (stimulated by beta-adrenergic agents) and leptin secretion by adipocytes are down-regulated by neurons in coculture, effects apparently mediated by neuropeptide Y (NPY)
Leptin is mainly produced and secreted by adipocytes, but other tissues and gastric glands have also recently been shown to produce it in a dual (endocrine and exocrine) mode.
Leptin was also detected in some microglobules in whole saliva obtained from four healthy volunteers. Co-localization for leptin, leptin receptor and glucocorticoid receptor in the same cell type suggested a functional relationship between glucocorticoid hormone and leptin secretion also at the level of the salivary glands.
Leptin, a circulating hormone secreted mainly from adipose tissues, possesses protective effects on many cell types.
Leptin, the adipocyte-secreted hormone that regulates weight, is known to link lipid metabolism with inflammation in various cell types
Leptin, a 16-kDa protein that is mainly secreted by adipocytes, plays a protective role in many cell types
Do the adipocytokines, leptin and adiponectin affect the granulosa cell expression of anti-Mullerian hormone (AMH) and its receptor (AMHR-II)?Leptin suppresses AMH mRNA levels in human luteinized granulosa cells through the JAK2/STAT3 pathway, while adiponectin has no such effect.AMH is one of the most reliable markers of ovarian reserve
Leptin, the adipocyte-secreted hormone, exerts its main function as regulator of food intake and energy expenditure through central effects at the hypothalamic level.
Adipokines are a group of fat-secreted hormones and cytokines, including leptin and adiponectin, with important functions in humans.
Leptin, an adipose-secreted hormone, links metabolism and immunity.
Since the discovery of leptin secreted from adipocytes, specialized tissues and cells have been found that secrete the several peptides (or cytokines) that are characterized to negatively and positively regulate the metabolic process.
Adipokines (leptin, adiponectin, and hepatocyte growth factor (HGF)) secreted from adipose tissue have come to be recognized for their contribution to the mechanisms by which obesity and related metabolic disorders influence breast cancer risk.
These results show that there is a distinct female-type and male-type leptin pulsatility pattern and each is amenable to augmentation by gonadal steroids either involving mechanisms that impart leptin pulsatility patterns directly at the level of adipocytes and/or at hypothalamic target sites..
Leptin is a circulating hormone secreted by adipose and a few other tissues.
Cyclin D1 is expressed exclusively in luminal keratin 8 immunoreactive tumor cells and is dependent on the adipose secreted hormone leptin.
In gastric cells leptin follows a rapid regulated secretion pathway whereas adipocytes secrete leptin in a constitutive slow fashion.

Answer: leptin is mainly produced and secreted by adipocytes, but other tissues and gastric glands have also recently been shown to produce it in a dual (endocrine and exocrine) mode.
 Although leptin is produced mainly by white adipose tissue, several laboratories have shown low levels of leptin production by a growing number of tissues including the anterior pituitary gland.
 Although leptin is produced mainly by white adipose tissue, several laboratories have shown low levels of leptin production by a growing number of tissues including the anterior pituitary gland. Lipolysis (stimulated by beta-adrenergic agents) and leptin secretion by adipocytes are down-regulated by neurons in coculture, effects apparently mediated by neuropeptide Y (NPY)
Although leptin is produced mainly by white adipose tissue, several laboratories have shown low levels of leptin production by a growing number of tissues including the anterior pituitary gland. Lipolysis (stimulated by beta-adrenergic agents) and leptin secretion by adipocytes are down-regulated by neurons in coculture, effects apparently mediated by neuropeptide Y (NPY). Leptin is mainly produced and secreted by adipocytes, but other tissues and gastric glands have also recently been shown to produce it in a dual (endocrine and exocrine) mode. Leptin was also detected in some microglobules in whole saliva obtained from four healthy volunteers. Co-localization for leptin, leptin receptor and glucocorticoid receptor in the same cell type suggested a functional relationship between glucocorticoid hormone and leptin secretion also at the level of the salivary glands. 
Leptin is mainly produced and secreted by adipocytes, but other tissues and gastric glands have also recently been shown to produce it in a dual (endocrine and exocrine) mode. Co-localization for leptin, leptin receptor and glucocorticoid receptor in the same cell type suggested a functional relationship between glucocorticoid hormone and leptin secretion also at the level of the salivary glands.
Leptin is mainly produced and secreted by adipocytes, but other tissues and gastric glands have also recently been shown to produce it in a dual (endocrine and exocrine) mode.
Co-localization for leptin, leptin receptor and glucocorticoid receptor in the same cell type suggested a functional relationship between glucocorticoid hormone and leptin secretion also at the level of the salivary glands. Leptin is mainly produced and secreted by adipocytes, but other tissues and gastric glands have also recently been shown to produce it in a dual (endocrine and exocrine) mode.
Leptin is a 16 kDa protein that exerts important effects on the regulation of food intake and energy expenditure by interacting with the leptin receptor in the brain and in many other tissues. Although leptin is produced mainly by white adipose tissue, several laboratories have shown low levels of leptin production by a growing number of tissues including the anterior pituitary gland.
Leptin was also detected in some microglobules in whole saliva obtained from four healthy volunteers. Co-localization for leptin, leptin receptor and glucocorticoid receptor in the same cell type suggested a functional relationship between glucocorticoid hormone and leptin secretion also at the level of the salivary glands.  Although leptin is produced mainly by white adipose tissue, several laboratories have shown low levels of leptin production by a growing number of tissues including the anterior pituitary gland.
Exact answer: adipocytes